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1. didactical test interrogator – dti529

1. Note Notice that upon power loss the UDR600 will always return to its default transport d layer protocol configuration IE UM 00171 002 DTI529 RASS S Tutorial odt LET UI Ga GU Tse N 6 A 6 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 2 Upon startup of the UDR Recording tool the preferences window will automatically pop up This window can also be called by clicking the Preferences button Three tabs are selectable The tab General is used to specify the number of ACP pulses per revolution connected to the UDR600 Notice that ACP ARP signals are not strictly required for the UDR recording tool o 12 bit 4096 ACP per revolution o 14 bit 16384 ACP per revolution o 16 bit 65536 ACP per revolution The preferences window is also used to configure the different channels individually Each of the two channels can have its own settings Select a channel by clicking on its respective tab According to the Line settings some controls can be disabled It is most convenient to enter the settings left to right starting with the Line Settings o Specify the Type of recording None or Passive None means that this channel is not used No further settings need to be entered Passive means that this channel is recorded in spy mode listening only o Select the Line Type electrical standard RS 232 or RS 422 o Select the Rx and Tx Clock generation internal or external If internal
2. gt Load Receiver Calibration File EIZ Receiver Calibration Mode 2 2 C Default File SH Curve Settings 1 8 SCH Ee Offset 30 00 dBm lB 7 Slope 27 65 m dB 2 Calibration File 1 0 i CAL_080619DTI RIM CAL 0 8 0 6 0 4 0 2 0 0 0 2 75 0 70 0 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0 15 0 10 0 E ST ru e Cea A Figure 37 Load Receiver calibration file window Select Done to return to the main Downlink window or cancel to return without making changes 2 Click the Scope Preview 8 button to open the Scope window allowing you to select the measurement window IE UM 00171 002 DTI529 RASS S Tutorial odt 42 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 gt RASS M Downlink Preview vi Scope Trigger Mode Triggered Hold Off ms 1 I D 1 1 I 1 1 I D 1 D om 200 00 400 00 600 00 800 00 1000 00 1200 00 1400 00 1600 00 1800 00 2111 87 JSM eT chi L us J DO du QG Figure 38 Scope Window 3 Set the cursors of the measurement window outside the STC period and within the range as shown in the figure above The HPD signals in the polar diagram of the main downlink window are updated automatically each time a cursor is moved The mean value between the cursors will be calculated and used for the measurement 4 The HPD signals are shown in the polar diagram The antenna diagram window should be at the n
3. sar l Intersoft Electronics Power Test Interrogator T1529 9 Power from RFA641 or ace ON external power supply B Transmitter Trigger Dig Timing Signals 15pHD to 5BNC cable Dig Signal Monopulse Receiver OBA OBI 2 A Q RHP Simulator e 4 EE ee Fa s SINPOW a ZE7Sa m SINPOW oO ZEZSY RADAR DATA RECORDER UDR 765 RxC2 RxC1 RxD2 RxD1 USB Connection with computer Power Connection to power supply Figure 66 Data Recording Set up with DTI529 and UDR600 IE UM 00171 002 DTI529 RASS S Tutorial odt 70 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 11 Annex 11 Configuration List Check Qty Description Item List Didactical Test interrogator O 1 Didactical Test interrogator DT1529 DTI Accessories P533 O 1 Power Cable DB9 m to DB9 f 3m O 1 Magnetic mount antenna IE UM 00171 002 DTI529 RASS S Tutorial odt 71 71
4. IE UM 00171 002 DTI529 RASS S Tutorial odt 66 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 7 Annex 7 Sector Recording Connection Diagram Antenna Rotation Simulator SS SE Intersoft Electronics Test Interrogator T1529 Encoder ond C 12bit 14bit aan S SSR DH C e j 20dB attenuator 4sec 8sec L v z w o Transm Her G 3005 3008 e 3008 Trigger e On off Mode zs E Mor opulse Receiver O O O O RE Z T t RH Simulator YIG FILTER TRANSCEIVER RADAR FIELD ANALYSER RFA641 ELECTRONICS RIM Front POWER ANALOG T li ut Output RADAR INTERFACE MODULE el ce O L O RIM782 We m er felt ES C Ch1 out Ch2 in RIM Back USB Connection with Computer GPS USB RASS Serial Data 1 Differential ACP1 ARP1 ACPI ARPI Tigger 1 Data Serial Data 2 Differential ACP2 ARP2 ACP2 ARP2 Tigger 2 Power Connection USB Connection with Computer Power Connection Figure 63 Sector Recording Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 67 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 8 Annex 8 Sector Recording with RFM Connection Diagram Antenna Rotation Simulator EE Intersoft Electronics Test Interrogator T1529 Encoder oeo sep v R Transmit er Q Ga el om s Sn P k RE Trigger On Mon pulse Receiver AB 0 ar i Dacs RHP 3
5. IE UM 00171 002 DTI529 RASS S Tutorial odt 9 71 Didactical Test Interrogator DT1529 GLOSSARY OF TERMS ACP Azimuth Change Pulse ARP Azimuth Reference Pulse CPU Computer Processing Unit CW Continuous wave dB Decibel Downlink The signal path from aircraft to ground FFT Fast Fourier Transformation FL Flight Level unit of altitude expressed in 100 s of feet FRUIT False Replies Unsynchronized In Time unwanted SSR replies received by an interrogator which have been triggered by other interrogators GPS Global Positioning System IE Intersoft Electronics IF Intermediate Frequency IPR Interrogations Per Revolution Monopulse Radar receiving processing technique used to provide a precise bearing measurement MSE Mean Squared Error MSSR Monopulse Secondary Surveillance Radar NM Nautical Mile unit of distance OBA Off Boresight Angle angle between the axis of the antenna and the direction of the target OBI Off Boresight Indicator PPI Plan Position Indicator PRF Pulse Repetition Frequency PSR Primary Surveillance Radar Radar Radio Detection And Ranging RASS R Radar Analysis Support Systems Real time measurements RASS S Radar Analysis Support Systems Site measurements RF Radio Frequency RMS Root Mean Square RX Receiver SAC System Area Code SAM pulses Synchronised Amplitude Modulated p
6. 03 Jan 13 D SECTORIAL VIDEO RECORDING 5 1 Getting Started Normally the Sectorial Video Recording will record opportunity traffic When using the DTI529 the RFA641 is used for target injection Both tools RFA641 and RIM782 are set up on the same desk as shown in Annex 7 Sector Recording Connection Diagram When the connections are made open up the Outbeam Interference Generator tool from the RASS S toolbox EW the Scenario Generation SSR wi button and the Sectorial Video Recorder tool from the Video El button es Interference_Generator_RFA vi File Edit Operate Tools Window Help Fruit Colle i Sectorial Video Recorder Distribution ll Edt Window ele TeS Fruit Type aa pe SC 1 l Sec 1090 La random evice O O Cl O equidista RIM782 97 03 47 Timing ACP 0 ACPR 0 exponent ARP 0 IPR 0 Sector Settings Center Window 45 00 Z deg 30 00 deg out sector in sector Min dBm e ord Settings ath Gees aan YIDEO SECTO Recording Size Time min MB Nah RIM Buffer Record Progress Info Graph Palette Figure 41 Outbeam Interference Generator software left and Sector Recording software right 5 2 Using the Outbeam Interference Generator RFA641 The RFA Interference Tool is in
7. DTI529 Edition Date 03 Jan 13 4 Start a sweep by clicking the Sum button A dialog box will prompt the user to check the connections of the different channels to the back panel Ch2 In and the Tx of the RFA641 Confirm the connections by clicking OK Next the frequency sweep is carried out On the centre frequency the graph should show OO dB Rx Bandwidth Calibration Sum 0 25 D Fa ec 4 30 0 e 18 35 0 40 0 t I t TT i t 1 FT 990 1020 1040 1060 1080 1100 1120 1140 1160 1190 MHz Figure 25 Bandwidth measurement result The little spikes on the BW graph are due to the poor quality of impedance matching in the Test Interrogator There is no linear response to the different powers of the test pulse that are used in the dynamic mode Enter 3 dB or 10dB in the Rx Bandwidth calc field and the respective filter bandwidths will be calculated and displayed 2 Proceed with the measurements of the Delta channel Disconnect the BNC BNC cable coming from the RFA641 Tx connector and going to the 2 connector of the DTI529 at the 2 connector and connect it again to the A connector of the Test Interrogator Disconnect the BNC BNC cable coming from the Ch2 in connector at the back of the RFA641 and going to the 2 Receiver connector of the DT1529 at the 2 connector and connect it again to the A Receiver connector of the Test Interrogator channel The previous steps 3 to 5 can now be repeated for the D
8. 03 Jan 13 9 5 Annex 5 Sectorial STC Sweep Measurement Connection Diagram Antenna Rotation Simulator ES Intersoft Electronics Power Test Interrogator T1529 ACP w 50dB attenuation 12bit 14bit Tx On Te Ce A BNC BNC cable Rf Test Pulse Inje tion Transmitter Trigger OBA RHP Simulator Dig Timing Signal 15pHD to SBNC cable BNC BNC cable Return Signal from DTI529 RFA Front TRANSCEIVER YIG FILTER RADAR FIELD ANALYSER RFA641 RFA Back DIGITAL Iin ut Output USB Connection with Computer Power Connection Figure 61 Sectorial STC Sweep Measurement Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 65 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 6 Annex 6 Downlink Measurement Connection Diagram Sa Antenna Rotation Simulator Intersoft Electronics Test Interrogator T1529 Encoder ACP Motor ar i EK sep sep 2 A Q Transmit er Q 30dB s 3098 s 3008 SLs Trigger On cf Mode Nc 5 L mn Mon pulse Receiver B 0 90 OBA OBI it 9 RHP 3imulator 1 eee ae RIM Front em JER ANALOG I l c5 F P RADAR INTERFACE MODULE llel aall G RIM782 CH Chi out Ch2 in RIM Back O USB Connection with Computer GPS Power Connection USB Connection with Computer Power Connection Figure 62 Downlink Measurement Set up with DTI529
9. 5 Only All Call DIE v Sector Line Misc Video Settings v Sector Indicator lies Mode 5 Only Roll Call Video Fading i R B LC D Sector Indicator 1 Digital Trailing Combined PSR SSR HUE L0 7 Width Display Range Combined PSR Mode 5 All Call o EIS Figure 43 Display Settings 4 The recording is started by clicking the Record SI button Clicking it again or clicking the Stop m button will halt the recording If the allocated space is full the recording will stop automatically IE UM 00171 002 DTI529 RASS S Tutorial odt 47 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 PC tOMMd il i geg KZT OT d BI KN File Edit Window Help aje j u 9 8 Device RIMZSZ 97 04 79 Timing ACP ORP 2446 205 APR IPR 4095 5192 Sector Settings Center Window 90 00 deg 90 00 deg Record Settings Path Recording Size Time 1 GB 2 1 min Chunk Size Revs 128 MB 30 5 RIM Buffer Record Progress wal Info Graph Palette Haee SIS Ea E Running Figure 44 Sectorial Video Recording The sectorial video viewer provides a detailed view of the video inputs and timing signals recorded with the Sectorial Video Recorder Where the Sectorial Video Recorder displays the data in a PPI window
10. 50 0 55 0 60 0 65 1 1 1 I 1 I 1 1 I l 1 I 1 I 1 1 2 658 2 800 3 000 3 200 3 400 3 600 3 800 4 000 4 200 4 400 4 600 4 800 5 000 5 200 5 400 5 522 Tal 8 2f20 3 Le OEE se aes scone D TSH efs3 4 Je LI e r Set Up Pulses ssp Filter Orsr O Ra ST 7 ei HD ro a ES i 00 s mg apen Uplink_100330_120835 pls Pulses scope Co JA Jk Ai A Sum P1 P3 4 6 8 10 12 14 16 18 20 22 ys e 12 0 IE UM 00171 002 DTI529 RASS S Tutorial odt 3 22 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 6 First select the HPD extraction method This depends on the kind of stagger pattern of the radar system of interest as determined in previous section If the stagger period is repetitive select the Tracked method If the stagger period is random or non repetitive select the Triggered method 7 The red cursor Threshold introduces a virtual new trigger level to the pulse file All pulses below Threshold default 90 dBm will be cut off This feature is built in to remove the effects of noise pulses on the extraction algorithms To set the threshold level make sure one boresight of the radar of interest is shown Now set the threshold level by moving the red cursor line to the correct level To obtain a useful antenna diagram the pulses shown should at least cover a dynamic range of 40dB 8 The blue cursor Boresight determines the detection of boresight To have correct
11. Color scale 35 2 50 0 60 0 70 0 coat art Krn Legend d 0 00 Azimuth deg _ 0 0 00 m Scan o BackGroun m ma x Nm D LE Sum Get Dels 4 0 sls g 6 0 8 0 10 0 12 0 14 0 16 0 18 0 20 0 22 0 24 0 S Lat sab 32 0 S i i dlan deg 200 00 De 150 00 125 00 100 00 75 00 Sb 0 00 em S000 75 00 100 00 125 00 150 00 175 00 200 00 peg 1 99 ae BHT Coe em 2 S Figure 2 Example of measurements of DTI529 signals D SG e e e e e ee e ee e e e e ee e ee e ee ee e ee e ee e ee e ee ee e e ee e ee ee e ee e ee e ee e ee e ee e e e e e e e e IE UM 00171 002 DTI529 RASS S Tutorial odt 14 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 The picture above is a combination of several measurements that can be performed using the RASS S soft and hardware and the DT1I529 as the signal generator The bottom picture is a downlink antenna diagram which was measured and presented as an HPD the Horizontal Polar antenna Diagram The snapshot on the top leftside Third View vi is the result of the sectorial STC program of the Didactical Test Interrogator One can see that the STC is sectorial yellow stains in the centre of the graph The red circle is an indication where the HPD of the bottom picture was measured The right graph is the response of the sectorial STC program on a specific radius red line This tutorial
12. Diagram Antenna Rotation Simu ator S Intersoft Electronics Power Test Interrogator T1529 Encoder ACP Ge n 12bit 14bit BNC BNC cable Rf Test Pulse Injection Transmitter Trigger l l RHP Simulator Dig Timing Signal 15pHD to SBNC cable BNC BNC cable Return Signal from DTI529 RFA Front TRANSCEIVER YIG FILTER RADAR FIELD ANALYSER RFA641 Ha INTERSOFT ELECTRONICS RFA Back DIGITAL In ut Output USB Connection with Computer Power Connection Figure 59 STC Sweep Measurement Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 63 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 4 Annex 4 DSTC Sweep Measurement Connection Diagram Antenna Rotation Simulator z E 5 Intersoft Electronics Test Interrogator T1529 Encoder ACP o 12bit 14bit Motor DT dsec 8sec PSR sep BNC BNC cable Rf Test Pulse Injection Transmitter Trigger On AC RHP Simulator Dig Timing Signal 15pHD to 5BNC cable BNC BNC cable Return Signal from DTI529 Connect to Q RFA Front TRANSCEIVER YIG FILTER x p o RFA Back POWER ANALOG DIGITAL In ut Output ce lt I 9 USB Connection with Computer Power Connection Figure 60 DS TC Sweep Measurement Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 64 71 Didactical Test Interrogator DTI529 Edition Date
13. E E E EE E oe ee ene ee er eee eee 33 3 3 STC DSTC Sweep MeasSureme nt cece ecce eee s seene eee eee 33 3 3 1 Getting En ME 33 3 3 2 Performing an STC Sweep Measurement ee eee ee 34 3 3 3 Performing a DSTC Sweep Measurement eee ee e ee e e ee ee 36 IE UM 00171 002 DTI529 RASS S Tutorial odt 4 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 SE er 3 3 4 Sectorial STC Sweep Measurement sss seessseeess sees NENNEN sees enen ennenen ennenen 37 SE Ng Getng Mane TT 37 3 4 2 Performing a Sectorial STC Sweep Measurement see ee e ee e e eee 38 ea VIG AN E 40 4 DownLink ANTENNA NIESASUREMENT cesse ece ec e eee eee eee eee 41 BA AC LING CAN CC E 41 4 2 Setting up the RFA641 for the Downlink Antenna Measurement sccccsseeeseeeeeeeesseneeeeeees 41 4 3 Performing a Downlink Antenna Measurement using the RIM782 ccccssseseeeseeeeeeeeeeeeeeeees 42 AA VieW HPD A e snsd eaii A EEEa 44 E 44 5 SECTORIAL VIDEO bRrcoppwe sss ec e s eee eee eee 45 EN Re lee KE AN T 45 5 2 Using the Outbeam Interference Generator RFAG41 scccssseeeeseeeeeeeseeneeeeeneeeeneesanesensonenees 45 5 3 Performing a Sectorial Video Recording RIN ZZ s esse essen ennenen 46 5 4 Analysis Sectorial SSR Video VIeWwWer cscsss sees sees e esse sese 48 e CS NN US DE 49 5 4 2 Sectorial Video Viewer Gofbware REENEN ENEE ENNER 49 To E EN 50 6 Remote Fiero Monitor Function
14. UDR 600 OF UDR serial Nr HDLC deg Connection GPS WD 1929 ACP A 03328 GPS timing not used o GFS time correction done Passive Rx Good 354 Bad 0 Figure 53 UDR Recording 6 Once the recording has been stopped using the Stop LU button the tool will automatically prompt the user to save the temporary file to disk One can also use the Save S button to save the data IE UM 00171 002 DTI529 RASS S Tutorial odt 57 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 In case a GPS450 is used for UTC time stamping the GPS450 can be directly connected to the RJ45 GPS input port of the UDR600 Since the DC Power for the GPS cannot be supplied through the USB bus it is necessary to connect the power supply to the DC power input connector of the UDR600 In the Preferences window one should check the Use the GPS for time stamping selector in the General tab to activate the GPS time stamping function The UDR GPS init window will pop up when you push the OK button of the preferences window Next you have to wait until the GPS450 is synchronized OK button is enabled then push the OK button to return to the UDR Control software More information regarding the use of the GPS450 can be found in the GPS450 User Manual 8 3 Convert Data Recording The Convert Data Recording tool can be opened from the Serial Data s button on the RASS S toolbox i Convert vi File Edit Operate Tools W
15. be re loaded in a later stage using the Load button 5 3 Performing a Sectorial Video Recording RIM782 The sectorial video recorder has been designed to create highly detailed video recordings unlimited in both range as azimuth When the Select folder button E is clicked the user will be prompted to select a folder which will contain the sectorial recording By default the folder Campaign VIDEO SECTOR will be selected The user is encouraged to create a new folder for each recording With the Sector Settings the user can select a part of a scan to reduce the amount of disk space needed for the recording In this example the window width has to be set to 90deg while the Center setting is set to 45deg In case the injected targets cannot be viewed the Display Settings need to be changed through the L Settings menu To get a similar result as in Figure 44 the Display Settings should be set about the same as in the figure below IE UM 00171 002 DTI529 RASS S Tutorial odt 46 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 Display Settings Video Color Digital Label Rings amp Spokes Brightness Bam Maie A code oct o arial Font gS pro 50 REENEN Moie Altitude ft 10 Font size 12 landes None kd 45 Rotation S hm U 100 Display Digital Symbols Visible PSR Only E IT video Data Digital Data SSR Only EI Late Block 2 Rings D Spokes 2 E Interpolate Mode
16. boresight detection this cursor should be set above the sidelobes and lower than the boresight maximum of the radar of interest When a number default 5 of pulses above boresight are detected taking into account the selected timing and extraction method boresight is declared Using the boresight positions the revolution time is calculated Figure 13 is a good example of the correct positioning of the Threshold and Boresight cursors 9 If you now click the HPD button the HPD will be extracted The HPD graph is drawn in the graph and the scale changes to degrees IB View RFA pulses vi RY Tracked l0 Pi BE 7 P2 15 0 EN P3 17 5 p 20 0 SUM 22 5 Gage 25 0 Sien 30 0 A D L SZ A A i rna S vda 37 5 S A S 40 0 32 d gt Z 42 5 p E aha ana AWN Saat 525 T ENN 55 0 1 180 0 160 0 140 0 Am 0 100 0 80 0 60 D A0 0 20 o Dn 20 0 40 0 60 0 80 0 100 0 120 0 140 0 160 0 180 0 LS al Poresight f148 8_ f20 3 Jas LIL JE lt lt ideo e FE S amp ba u Scope D IS Ja 18 Xoffset 2 00 0 00 2 00 efs3 4 Jas LIL JE r Set Up Index Puls SEE Dees ssp Filter Sal CT Opsr O 4 ka 0 Abs 012345 ORel Time 4 19 s Z EFE Ep Uplink_100330_120835 pls Sum P1 P3 e 12 08 38 PM Figure 14 Extracted HPD 10 It is advised to use the filter at this point to improve the
17. going to the A Receiver connector of the IE UM 00171 002 DTI529 RASS S Tutorial odt 28 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 DT1529 at the 2 connector and connect it again to the Q Receiver connector of the Test Interrogator The previous steps 3 to 5 can now be repeated for the Omega D channel 8 The user can select a filter option so that the calibration curves are improved and spikes due to the operational use of the radar are removed To do this check the Filter check box on the graph The filtering is done only for the part of the curves between the cursors So move the left cursor approximately to the noise floor intercept point before checking the filter box to reduce the curve fitting oscillations Try to avoid that the end of the curve bends upward Do this by changing the order of the filter and more important by moving the position of the cursors to the knee of the Rx curve nas Q fog Rec Calibration Sum h 5 N fog Rec Cafbration Sum Delta Deta 00 Omega 2 00 Omega i i d e Ba F d SS TTT Ss oe 8 8S a 8 DR B amp B a S ey E E E ey N S N N S Pa 0 00 lt H dBm beem 8 dem I i t I i We I I 1 i 1 I k I D 110 100 30 B0 s 60 50 40 H 10 U 110 cO 20 B0 FO Kell 5 40 i 21 Wl D 20 Figure 22 Positioning cursors for correct filtering The filter consists of a median filter of
18. is chosen for one of both specify the Baud rate o Select the Data format and Layer This is important since it will allow the serial convert program to automatically perform a convert with the correct data format setting Notice that some transport layer protocols can handle several data formats i UDR Preferences vi General Linel Linea Line settings 1 Physical Laver 1 Laver U HDLC Line Type Type Passive Appearance D Protocol Rx Clock Tx Clack External Baudrate Cancel Figure 52 Example for DT1529 Figure 52 shows the correct settings in case the DTI529 simulator port 2 is connected to the UDR600 when both Ch1 and Ch2 of the UDR600 are connected the settings for Line 2 are the same Click OK to save these settings and return to the recording tool 3 The leds on the RS232 Probe Module indicate whether data and clock are detected In case one of the leds isn t burning change the corresponding switch Depending on the setting of the switches data is read from pin 2 or 3 and clock is taken from 17 or 24 4 Click the record Z button to start the actual recording The recorded data is stored in a temp file IE UM 00171 002 DTI529 RASS S Tutorial odt 56 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 Beware a new recording will always overwrite the data stored in the temp from a previous recording While recording the HD position indicator will count the Kilobytes file
19. measurement can be performed 4 1 Getting Started Normally the RFA641 is set up in the field while the RIM782 is set up on site When using the DTI529 both tools RFA641 and RIM782 are set up on the same desk as shown in Annex 6 Downlink Measurement Connection Diagram When the connections are made open up the Uplink tool from the RASS S toolbox using the Uplink S button and the Downlink software using the Downlink Ua Radar Field Analyser vi Lei ASPs e File Info P Receiver E O O gt Ge Er Max widths il jownilin indo e Sampling spes r Sample Window dBm P 16 Mhi _ Device E RIM782 97 03 47 el Log Olin Analog Input 1 Analog Input 2 ET DELTA OMEGA v CH2 Video w Encoder S Trig l ACPIJARP1 ze Triggeri v Calibration File I Info 80 0 ERF TEN Ring Settings rings 4 dBjring 10 S SN Graph Pallet Counters chi USYS ACPR fo che LPY m fg ch3 Bd ARP o Bai SE No receiver calibration File selected Figure 35 Uplink Software left and Downlink software right 4 2 Setting up the RFA641 for the Downlink Antenna Measurement 1 The Uplink program contains 4 different programs which can be selected via the selector in the top right corner of the software vi For the downlink function the Transmit program needs to be selected as it transmits pulse
20. of the recording time If no indexing was performed before this process will start automatically The user can abort the indexing using the Stop button but only the revolutions that were processed can be viewed then The indexer runs detached As soon as the first scan is processed the user can start analyzing the data Once indexing is done the video display will show the data of the first scan relative to the default range reference 3 When the file is loaded the Video Window controls determine the section of the data to be displayed The video data which is shown in the graph is decimated to minimize memory requirements upon loading the file Full resolution is achieved by zooming in or adjusting the window IE UM 00171 002 DTI529 RASS S Tutorial odt Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 size 4 Next to the window size controls you can find the properties of the recording Recording info user comments Scan default at 0 Recording Scan Time of recording Start and Stop Azimuth ACPR O O O O O O 5 5 Exercises 1 Interference Generator The user is advised to experiment on his own the different settings of the Fruit Type and the Fruit Content tab More information regarding the parameters in the different tabs can be found in the RFA641 user manual 2 Sectorial Video Recording The user is advised to experiment on his own the different settings of the Sectorial Video Recording software M
21. order 1 followed by a polynomial fit algorithm from which the user can alter the default order of 5 to a higher value The MSE indicator shows the Mean Squared Error of the curve filtering 9 Only the part of the curve selected with the cursors on the Log Rec Calibration graph is saved to disk Therefore first select the portion of the receiver curve you want to save and click the Logging Fa button The VI will prompt a standard file dialog Fill in the desired calibration file name and save the calibration data on disk 3 1 3 Typical Result The results can be reviewed by selecting the View Cal BW STC Logfiles tool from the Rx menu The View Rx Calibration vi window will appear just hit the Load button and select the logfiles that you want to examine The window shown below is a typical result of a Rx calibration Sum Delta and Omega IE UM 00171 002 DTI529 RASS S Tutorial odt 29 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 View Rx Calibration vi Date dom _1 42_ CID Dx dB CAL_100330 CAL Time dem 1 05 Y wl 19 o Dy H d n 2 801 Y CIR Slope VI dB Horz2 22 7 _ dem 178 v OUA O Rx Calibration Curve 75 70 0 5 1 d 20 0 15 0 10 0 IDE Y M BL Input power dBm ID LS dn x Unfiltered J Figure 23 Rx Calibration Example 3 1 4 Exercises Check what happens if you e Change the Power step e Unselect the View checkbox during the sweep e Enter the wrong va
22. the vi 2 In order to get an optimal result for the measurement on the test interrogator the default parameters should be adjusted to the following values o Attenuation 30 dB o Pulse width 20 microseconds o Start delay 50 microseconds o Step 1 microsecond o Stop delay 560 microseconds stop before the Downlink simulation starts The Calibration Pulse field continuously monitors the signal available on the Ch2 video input at the selected delay Set the cursors at the beginning of the pulse 3 Click the Sum button to measure the gt channel A dialog box will prompt the user to check the connections of the different channels to the back panel Ch2 and the Tx of the RFA641 Confirm the connections by clicking the OK button gt STC_DSTC Calibration vi Pee elaielolr e dB DSTC Calibration i TIS Power Mon Attenuation d8 Se Tx Frequency Mhz ee Pulse width us Delay after Duke o HS 60 0 r Triggering 80 0 Start Delay 35 ps 92 0 Stop Delay US Step US d n r Calibration pulse Amplitude _0 26_ 50 0 35 Trigger delay ps 560 View ba Ty Figure 28 DSTC measurement result IE UM 00171 002 DTI529 RASS S Tutorial odt 36 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 While the measurement is performed the result is immediately visible In case the measurement result is not as expected the procedur
23. will explain how to perform all of these measurements and even more IE UM 00171 002 DTI529 RASS S Tutorial odt 15 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 2 UPLINK ANTENNA MEASUREMENTS The Uplink measurement tool records radar pulses with the intention of extracting an HPD from these pulses The pulses can be recorded in a condensed format pulse mode or in detail scope mode After the recording the HPD can be extracted from the data through fingerprinting stagger The following section explains which actions need to be taken to perform such an uplink measurement on a DT1529 2 1 Getting Started The Uplink is loaded from the RASS S Toolbox using the Uplink i button Radar Field Analyser vi Gleis a e e File Info M Receiver Sa Max widths us r Sample Window r Sampling speed 16 Mh2z 4us M Trigger dBm r Progress 80 0 File usage 0 Kb ps LOS SS Time s H DIY dp Pulse count o Figure 3 Uplink Software Make the connections as shown in Annex 1 Uplink Antenna Measurement Connection Diagram and set the DTI529 switches as follows e Encoder either setting e Motor either setting e SLS ON e Mode A C e Tx ON e Antenna Secondary The user can decide to perform an RFA Selftest first advised after transportation of the RFA641 The Selftest software is self explanatory and also descri
24. wrong value for the attenuation s Disconnect the trigger e Use the wrong video output Q What are you measuring 3 3 STC DSTC Sweep Measurement The STC measurement result consists of an RF input power versus time table To be able to measure the gain vs time delay the RFA641 needs to be synchronised to the interrogation signal of the radar under test The position of the RFA641 transmitters output pulse is then altered in discrete steps ranging from a set maximum Stop Delay to a minimum Start Delay The power level for the measurement pulses can be set in the Tx power control Make sure that the power of the measurement pulses is within the receiver range Two measurement methods are implemented 1 STC Measurement of the STC curve in case the STC is implemented in the receiver and directly measurable at the output of the receiver The RFA641 will inject pulses of a fixed Selectable power level into the receiver These pulses will then be varied in time delay vs the interrogation trigger The M SSR s analog video output signal is then sampled by the RFA641 This amplitude is passed through the calibration curve in order to build the STC curve a gain dB versus time delay curve 2 DSTC In this case the STC is implemented after the receiver section by applying a variable threshold when digitising the video Therefore the video level to be sampled for each of the receivers is the quantised video The Radar Field Analyser will inj
25. 0 1100 00 1000 00 900 00 800 00 700 00 03 mn R 600 00 GC 500 00 400 00 300 00 Re 200 00 100 00 SSl button on the RASS S toolbox the tool Y video v Range us ST 1100 0 1000 0 900 0 500 0 700 0 600 0 500 0 400 0 300 0 200 0 100 0 0 00 deg 30 00 35 00 40 00 45 00 50 00 55 00 60 00 em 70 00 75 00 80 00 85 00 90 05 GYM et Azimuth Range UD ru au I amplitude l 215 29 4 65 45 307 90 0 23 XIV video v ke T Zag 0 0 T i T 1 I 0 00 0 20 0 40 060 0 80 0 97 Azimuth al chi L ch2 p IER TOE Color Map x video v Gray HE 0 0 Video Window Scan Azimuth deg R en B Az lt gt deg en Z Range Reference A C e Recording Info test run 0 Recording Scan 17 Timestamp 20 14 21 wee Start Range Nm EES 0 60 0 en 70 0 75 0 80 0 85 0 a PR EE Ee Width E 2 lcu Average rel Chi F End Range Nm Stop Az deg 179 56 Variance 10 0 ch2 Average abs chz LE 100 ACPR 4096 S S Ready Figure 45 Sectorial Video Viewer example 5 4 2 Sectorial Video Viewer Software 1 Click the Select Folder S button to select a folder which contains the sectorial recording 2 Click the Automatic Indexing LC button to start the indexing process This process decodes all recorded interrogations and creates an interrogation index file Since it has to page through the complete recording it can take up to 10
26. 60 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 ANNEXES 9 1 Annex 1 S3 intersott Electronics Test Interrogator 11529 Encoder ACP 12bit 14bit Motor ARP Aner 8sec Transmitter Trigger On i Uplink Antenna Measurement Connection Diagram Antenna Rotation Simulator RADAR FIELD ANALYSER RFAG41 ANALOG Q Chi out Ch2 in mn USB Connection with Computer Power Connection Figure 57 Uplink Antenna Measurement Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 61 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 2 Annex 2 Rx Sensitivity and BW Sweep Measurements Connection Diagram e Antenna Rotation Simulator E om R Intersoft Electronics Power Test Interrogator T1529 Encoder ACP 12bit 14bit BNC BNC cable Rf Test Pulse Injection Transmitter z Connect to Z A Q Trigger l l RHP Simulator Dig Timing Signal 15pHD to SBNC cable BNC BNC cable Return Signal from DTI529 Connect to A Q RFA Front TRANSCEIVER YIG FILTER L RFA Back DIGITAL In ut Output L J Q USB Connection with Computer Power Connection Figure 58 Rx and BW Sweep Measurement Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 62 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 3 Annex 3 STC Sweep Measurement Connection
27. IE UM 00171 002 DTI529 RASS S Tutorial odt 34 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 mapping of the STC program from the Test Interrogator A dialog box will prompt the user to check the connections of the different channels to the back panel Ch2 and the Tx of the RFA641 Confirm the connections by clicking the OK button While the measurement is performed the result is immediately visible gt STC_DSTC Calibration vi Be DIS e D IS Ready to measure RF Pei ioe Attenuation dB Tx Frequency Mhz Pulse width US Delay after Pulse o Ju r Triggering Start Delay US 109 3 Stop Delay US step Tus ag r Calibration pulse V Amplitude y 227 L ff Liz 054 0 2 1 1 I 1 1 1 1 Ie O ABs 11 Sk AN 30 60 n 1 1500 US 1 U S 10 Trigger delay us 1500 View DA 60 0 Comment 50 0 100 0 HS IES o WOT L d x Figure 27 STC measurement result In case the measurement result is not as expected the procedure can be halted by pressing the Halt m button 8 Proceed with the measurements of the Delta channel Disconnect the BNC BNC cable coming from the Analog Ch2 in connector at the back of the RFA641 at the gt connector and connect it again to the A connector The previous step 4 can now be repeated for the Delta channel 9 Proceed with the measu
28. INTERSOFT EA BR EG T NW SERA ge S Didactical Test Interrogator DTI529 RASS S Tutorial Edition 1 Date 03 Jan 13 Status Draft Issue WWW INTERSOFT ELECTRONICS COM Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 DOCUMENT CHARACTERISTICS Didactical Test Interrogator DT1529 RASS S Tutorial Edition 1 Edition Date 03 January 2013 Status Draft Issue Keywords User manual DT1529 tutorial Didactical Test Interrogator RASS S Abstract Author This user manual describes the use of the DTI529 with the RASS S hardware Contact Information Elke Vanuytven Editor Elke Vanuytven Contact Person Niels Van Hoef Tel 32 14 23 18 11 E mail Address Document Name support intersoft electronics com Document Control Information IE UM 00171 002 DTI529 RASS S Tutorial odt Path C Documents and Settings elke Desktop RASS S User Manuals DT1529 Tutorial Host System Mac OS X 10 5 6 Software OpenOffice org 3 0 1 Size i IE UM 00171 002 DTI529 RASS S Tutorial odt 2 71 821021Bytes Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 Document CHANGE RECORD Pages Approved Affected by 001 02 Mar 10 New Document new layout All EV Revision Date Reasons for change IE UM 00171 002 DTI529 RASS S Tutorial odt 3 71 Didactical Tes
29. RFEAp6d4TL sss sss sss sss sss eee eenn 51 Wis CENNO SLAC aE 51 6 2 Remote Field Monitor SoTwWware ssssssssssess sees eeesss ereenn eenn ennenen ennenen eenn 52 AE EE 53 7 SERIAL Darta RECORDING RIM S sss sss sese eee eee 54 8 SERIAL Data RECORDING UDRpG0 ss sss sss ss sese eee eee eee 55 Biber ee da CAN LS TT 55 8 2 Performing a Serial Data Recordings css s esse essen ennenen eee 55 8 3 CONVEF RECETTE 58 Be e PA ANY SIS a E R E EE E REEE 59 63 VNC AN TE 60 Ds ANNEXE H 61 9 1 Annex 1 Uplink Antenna Measurement Connection Diagramm sss sssss esse esse sese ees sees e ee eee 61 IE UM 00171 002 DTI529 RASS S Tutorial odt 5 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 2 Annex 2 Rx Sensitivity and BW Sweep Measurements Connection Diagram ek 62 9 3 Annex 3 STC Sweep Measurement Connection Diagram esse se sss cesse esec 63 HA Annex 4 DSTC Sweep Measurement Connection Diagram sss sees s esse sese eee e eee 64 9 5 Annex 5 Sectorial STC Sweep Measurement Connection Diagram ccccccsseeeeseeeeeeseeseeesees 65 9 6 Annex 6 Downlink Measurement Connection Diagram REENEN esse esec eee DD 9 7 Annex 7 Sector Recording Connection Diagrams sssss sss sssss sss se ess sees eee eee 67 9 8 Annex 8 Sector Recording with RFM Connection Diagram ccccsseessseeesseeeeseeseeeeeeseeseeesees 68 9 9 Annex 9 RIM782 Data Recording Connection Diagram REENEN eeee se
30. ation curve in order to build the STC curve a gain dB versus time delay curve 3 4 1 Getting Started The Sectorial STC software is loaded from the RASS S Toolbox using the Rx E button IE UM 00171 002 DTI529 RASS S Tutorial odt 37 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 Sectorial_STC vi File Edit Operate Tools Window Help e EIl S r Power Setting us Un Ss 1510 L S m Attenuation dB E 4 BI I 2 zzz ei wm 4 C9 1200 33 0 30 0 dBm 1000 ji o oo Az 0 000 Frequency 800 Tx Frequency Mhz 600 ps S r Timing Start Delay us 200 0 Stop Delay us sd i sectors 200 400 600 800 1000 1200 30 0 40 0 50 0 D D Broh ani saha kre a 10 0 100 0 1510 f 1 1 1 HARK SIS s10 uda se d C M x Figure 29 Sectorial STC software Make the connections as shown in Annex 5 Sectorial STC Sweep Measurement Connection Diagram 3 4 2 Performing a Sectorial STC Sweep Measurement The program will ask to load the correct receiver calibration file The receiver calibration file is required in order to be able to calculate the exact power level corresponding to the measured pulse amplitudes The Down Calibration table2 vi will pop up with a dialog box to select a calibration file Select the file and click OK The selected calibration file is
31. bed in the RFA641 User Manual The Selftest however falls outside the scope of this Tutorial 2 2 Background Theory 2 2 1 Adjusting the Input Level If the signal is too high for instance the transmitting antenna is too close to the receiving antenna the curve will be cut off because of saturation as shown in Figure 4 IE UM 00171 002 DTI529 RASS S Tutorial odt 16 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 50 0 HERE H dp Figure 4 Example Input level too high Clearly in these circumstances the 3dB beamwidth cannot be measured accurately attenuators will need to be added to lower the receiving signal 2 2 2 Adjusting the Trigger Level However if you are using too much attenuation you will notice that the equipment is not recording all the data as the signal is too low Lower the Trigger level to the sidelobe level such that the curve moves smoothly again this will also make sure that all the interesting data is recorded data below the trigger level is not recorded The trigger level determines the level the video signal must cross to be detected If the Trigger level is set too high the data will look like Figure 5 and the sidelobes will not be recorded lp Ph 10 0 15 0 E A 250 z K ech 40 0 45 0 Figure 5 Example Trigger level too high If on the other hand your trigger level is too low the RFA641 will continuously sample noise The update of the graph
32. ccsssccssecenseessnseneneneees 60 Uplink Antenna Measurement Set up With DIIS 0 ccs s ssc esec ee 61 Rx and BW Sweep Measurement Set up With DTIa29 ssc s esc ee eee eee 62 STC Sweep Measurement Set up with DII5 Z0 css esse eee eee 63 DSTC Sweep Measurement Set up With DTIa29 ssc ss cesses eee eee 64 Sectorial STC Sweep Measurement Set up With DTIa29 css esec eee 65 Downlink Measurement Set Up With DTISa29 ssc essen eee 66 Sector Recording Set Up With DTISa29 sss ssss sese EE REEEEEE REENEN 67 Sector Recording RFM Set up With DTISa29 ees enen eee 68 Data Recording Set up with DTI529 and RIM782 css ssss cesses eee 69 Data Recording Set up with DTI529 and UDRpU0 sss sss cesse eee eee eee 70 TABLE OF TABLES Table 1 CT e TT Te css esse ces c codes cee eee coon edt ese ees 11 Table 2 Data Chanterelle eege eee eee 14 lt IE UM 00171 002 DTI529 RASS S Tutorial odt Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 Conventions USED d Note This icon to the left of bold italicized text denotes a note which alerts you to important information e Caution This icon to the left of bold italicized text denotes a caution which alerts you to the possibility of data loss or a system crash Te Warning This icon to the left of bold italicized text denotes a warning which alerts you to t he possibility of damage to you or your equipment
33. ck the OK button The selected file will be displayed in the active layer and its file name will be presented in the Layer info sub window the date and time of the recording is shown and diagram parameters of the selected logging are displayed 2 5 Exercises The following exercises can help you to study the RFA641 and Uplink antenna measurements more thorough Check out what happens if you e Change the antenna rotation speed e Change the antenna rotation simulator from SSR to PSR e Change the SLS switch turn it OFF e Use the triggered instead of the tracked mode to extract the HPD e Switch between Mode A C and Mode S IE UM 00171 002 DTI529 RASS S Tutorial odt 25 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 3 M SSR PSR Receiver MEASUREMENTS The RF Receiver is needed to convert the very low levels of RF available at the antenna into a video base band signal for further processing The dynamic range of the Rx noise floor to saturation level and the alignment of the monopulse channels can be measured directly Also before a Downlink measurement Bandwidth sweep or D STC measurement can be performed The calibration routine will use the RFA641 to send RF pulses with increasing amplitudes into the receiver under test The video output of these receivers is digitised by the RFA641 and used to build the calibration table s The final Rx calibration result consists of a receiver output voltage versus RF
34. ct Pulse files or Scope files as they were recorded with the RFA Recorder IE UM 00171 002 DTI529 RASS S Tutorial odt 20 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 2 Ifa Pulse file pls is selected then go straight on to point 3 If a scope file is selected scp or if the RFA Recorder is in scope mode when the View Data button is pressed the View Scope Recording window will open first The View Scope Recording program reads the consecutive recorded scope waveforms from disk and determines for each of the recorded waveforms the pulses and their amplitudes This is done using the same algorithm as is performed in the Radar Field Analyser in real time when performing pulse recordings The pulses with their calculated amplitudes are displayed in the Pulse graph in frames of a selectable number of pulses using the Pulses frame control If required click the Play button to convert the Scope file into a Pulse file During the conversion process the Pulse graph will be updated to indicate the progress of the conversion The program automatically creates a file on disk with the pls file extension alongside the source file Click the Return al button to return to the View RFA Pulses Window In case you click the Return button without having converted the file the program will warn and ask again if a pulse conversion must be executed 3 To extract the HPD of a specific radar out of the loaded pulse file the
35. e can be halted by pressing the Halt button The DSTC measurement cannot be repeated for the Delta and the Omega Channel using the DT1I529 5 When all channels are measured click the Save button to save the measurement data to disk The VI will prompt a standard file dialog by default pointing to the CALIB subdirectory of the MSSR or PSR subdirectory of the active campaign folder Type in the desired file name and save the data on disk or select Cancel if you do not wish to save the results 3 3 4 Exercises Check what happens if you e Disconnect the trigger e Run the STC measurement in the Downlink simulation Stop Delay 1500 microseconds e Saturate the low noise amplifier in the front end 3 4 Sectorial STC Sweep Measurement The Sectorial STC measurement result consists of an RF input power versus time table presented versus azimuth To be able to measure the gain vs time delay the RFA641 needs to be synchronised to the interrogation signal of the radar under test The interrogation trigger signal is used both as start of range and as azimuth indicator Due to limitations of the RFA641 digital input hardware only two timing signals can be connected simultaneously Therefore the interrogation count is also used to calculate azimuth The RFA641 will inject pulses of a fixed selectable power level into the receiver The M SSR s analog video output signal is then sampled by the RFA641 This amplitude is passed through the calibr
36. e graph As long as no calibration procedure has been started the tool is in free run mode This means that all parameters can be changed on the fly and their impact on the measurement is shown directly in the calibration pulse graph Move the slider under the display to change the transmission power of the RFA641 and see the impact on the display The output voltage is measured by calculating the mean max or RMS value of the part of the output pulse selected by the cursors Therefore it is important to position the cursors correctly If the measured part between the cursors is not flat spikes noise a beep is produced and the graph will turn red This does not mean that the calibration is wrong but that some points in the calibration curve can be erroneous 1 RF Section Set the Attenuation value to 30dB receiver inputs of the DTI529 are 30dB couplers 2 Triggering Section The receiver calibration is performed at a certain time delay after the interrogation trigger pulse set the Delay after Trigger value to 1000us Set the Pulse Width of the calibration pulse to 20us The calibration pulse will turn red and the user hears a beep indicating that the cursors are not set properly r Calibration pulse v Amplitude y Figure 18 Incorrect cursor setting Calibration Pulse Change the position of the cursors such that both are onto the test pulse the pulse will turn black indicating that the cursors are set correctly 3 V
37. ect pulses starting from a minimum delay up to a maximum delay For each delay step the power level injected starts from the selected maximum power level and is decreased down to the DSTC trigger level Depending on the delay from a certain RF power level the pulse will not pass the digitising threshold anymore and disappears at the quantised video output By presenting the measured threshold level vs time delay the Digital STC curve becomes visible 3 3 1 Getting Started The Radar STC Curve software is loaded from the RASS S Toolbox using the Rx H button IE UM 00171 002 DTI529 RASS S Tutorial odt 33 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 STC_DSTC Calibration vi File Edit Operate Tools Window Help el e Sac TSTS eg zB r Tx Power dB STC Calibration Attenuation dB Tx Frequency Mhz Pulse width US Delay after Pulse o Hs Triggering Start Delay US 89 3 Stop Delay 1500 jys step Ca Je odam r Calibration pulse Y Amplitude V 2 2 Y 1 5 7 nus 0 5 TES 1 1 1 1 I 1 lus 0 10 20 30 40 SO 60 70 C us i 1 10 Trigger delay us 1500 View DA Nm v I 1 r Comment 1000 0 1500 0 SAIS Cam Co os Coo a8 il sl res ENG Figure 26 STC DSTC Calibration software 3 3 2 Performing an STC Sweep Measurement Make the connections as shown in Annex 3 STC Sweep Measurement C
38. ee 25 Figure 17 Rx Calibration SOM WAN E 26 Figure 18 Incorrect cursor setting Calibration Pulse ss ccss cesses ece e eee 27 Figure 19 Verifying the connections css s sss sees e esec eee eee eee eee EEN 27 Figure 20 Rx Calibration Wd css s cesses cesse eee eee 28 Figure 21 Rx Calibration Second Sweep Append FUNCTION cscccsccccneccnecesnsccsnseanensansssneseansnsnnseneeeaes 28 Figure 22 Positioning Cursors for correct FIITCIING c112cccceecccnnecensneccenesenansnsanssenansesanesesanseeanensnanseaeennes 29 Figure 23 Rx CaliDraulon E Et css s css sees e eee eee 30 Figure 24 Rx Bandwidth Calibration SOfRWALEC cc cccssscccssecccenenensnscnenensessssansnsanesesansssansssanensssnsanenans 31 Figure 25 Bandwidth measurement result sss esse cce s ce se seene eenn eee 32 Figure 26 STC DSTC Calibration E e EE 34 Figure 27 STG measurement Eege 35 Figure 28 DSTC measurement TE 36 Figure 29 S ecl ri l STC SOMWAl E 38 Figure 30 Set sampling point of test pulse css c csc cesse eee eee 39 Figure 31 Verifying the connections css css css sees cesse eee eee eee eee 39 Figure 32 SCCLOM Al STO EE 39 PIQUIC 33 XYZ Graph dE 40 Figure 34 Sectorial STC Sweep RESUIE srcsisoswciesessevesurerencsiaeisa desinsdesbaveenvigesubeansedasiadie Verne laibeusadesindtosavienboed 40 Figure 35 Uplink Software left and Downlink software rgt sssss sss cesse cesses eee 41 Figur e e EE 42 Figure 37 Load Receiver Ca
39. efore a 0 8us pulse is analysed with a 1us pulse width window For each pulse detected a sliding window mechanism of three samples default is applied to the sampling mechanism The amplitude of the pulse is calculated as the maximum value obtained in the pulse width window after sliding window filtering Detected pulses are indicated at the output of the threshold detector blue curve If the detected pulse is longer than the maximum pulse width as determined by this parameter the software will insert the detection of a next pulse This way reflected pulses are indicated 2 3 Performing an Uplink Recording 1 The RFA Recorder software contains four programs re Scope Spectrum Transmit Figure 7 Measurement type selection e Pulse program records pulses in a compact format 8 bytes sample The data recorded is minimized describing only the amplitude and timing of each pulse in 8 bytes One should use this program for all Uplink HPD measurements e Scope program records detailed pulse images in 62 samples 128 bytes pulse The Scope program logs the complete pulse shape to disk since 128 bytes are used for each pulse This program can be used to record pulses in special conditions such as in extreme reflective environments or to completely view the pulses if no oscilloscope is available s Spectrum program scope recording with FFT converts the pulse images into pulse spectrum IE UM 00171 002 DTI529 RASS S Tutoria
40. elta _ l 3 Proceed with the measurements of the Omega channel Disconnect the BNC BNC cable coming from the RFA641 Tx connector and going to the A connector of the DTI529 at the A connector and connect it again to the Q connector of the Test Interrogator Disconnect the BNC BNC cable coming from the Ch2 in connector at the back of the RFA641 and going to the A Receiver connector of the DT1529 at the 2 connector and connect it again to the Q Receiver connector of the Test Interrogator The previous steps 3 to 5 can now be repeated for the Omega channel 5 Ameasurement can always be interrupted by clicking the Stop m button 6 When all channels are measured click the Save button to save the measurement data to disk The VI will prompt a standard file dialog by default pointing to the CALIB subdirectory of the MSSR or PSR subdirectory of the active campaign folder Type in the desired file name and save the data to disk or select Cancel if you do not wish to save the results 7 The results can be reviewed by selecting the View Cal BW STC Logfiles tool from the Rx menu The View Rx Calibration vi window will appear just hit the Load button and select the logfiles that you want to examine IE UM 00171 002 DTI529 RASS S Tutorial odt 32 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 3 2 3 Exercises Check what happens if you e Change the Step e Unselect the View checkbox during the sweep e Enter the
41. erify the correct connections as shown in the connection diagram and click the Sum button 4 Adialog box will prompt the user to check the connections of the different channels to the back panel Ch 2 in and the Tx of the RFA641 Confirm the connections by clicking the OK button ake sure the Sum channel video is connected to Analog input Ch2 of the RFA Backpanel and the Tranceiver Tx output is connected o the Sum op RF input using the antenna able and the apropriate attenuator Figure 19 Verifying the connections The calibration will now be executed IE UM 00171 002 DTI529 RASS S Tutorial odt 27 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 Ready to measure tog Rec Calibration ee dB eg d Power Step dB on off O Tx Frequency MHz Triggering Delay after Trigger 400 Tus On off U E Filter Timeout 10000 ps Order Pulse wl 100 lus Delay after Pulse _ 0 lus r Calibration pulse Y Amplitude 1 37 Y Se Max RMS us N U I 1 1 I 1 RAR 0 10 20 30 40 50 64 iln HSC to 1 89 3 Te power dBm 13 9 view A 0 25 H 1 1 1 Comment 110 100 90 80 70 r ar Dec Cursor 87 97 dem 0 108 y WEE Figure 20 Rx Calibration Example 5 If the noise level of the receiver is not reached during the calibration the receiver calibration measurement can be performed in successive steps in order to increase
42. es eee eee 69 9 10 Annex 10 UDR600 Data Recording Connection Diagrams sss sss ssss esse sese eess sese 70 CNN WT Ah KA Configuration B E 71 IE UM 00171 002 DTI529 RASS S Tutorial odt 6 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 TABLE OF FIGURES Figur 1 Block diagram DTID29 E 12 Figure 2 Example of measurements Of DT1I529 eignals csss cesse escena 14 Figure 3 UDIINK ee EE 16 Figure 4 Example Input level too NOD DE 17 Figure 5 Example Trigger level too high sssss esse sss essen eae eee eee 17 Figure 6 Pulse sampling mechanism Her s ssc ess esse sese sese eee KENNEN eee eenn eee 18 Figure 7 Measurement type SCIOCtION 1cccceecceeeccnncennnscnnensanecnneneanecsanneanecsanssanessanssanecaeeaecaeenesaneaneneenes 18 FIQUTC 8 Recording Path E 19 FIQUre 9 Uplink MCASULCMONE Egger EE EE eege 19 Figure 10 View RFA Pulses sSofware cs cesse esse esec 20 Figure 11 Selection of pulses to determine interrogation Uming css s sss c sss cesse esse eee eee EEN 21 Figure 12 View timing window Stagger pattern ccs s css s sese ces ec ese eee ennenen eee 22 Figure 13 HPD Extraction Threshold COntrol c sccccsseccsssencnnesecnnenccnnscnanseseassesansnennnsesaneenensesensnseeeenaes 22 wie Fr EXIT AC COT isa atiges ete E ars ae AE EE E EAE E EE E EEEE 23 Figure 15 HPD Out of Tolerance eege 24 Figure 16 View HPD Logfiles programi s lt ssss sss sese cesses sees enen e
43. est path used New files are therefore always created in the last folder that was selected When you have selected the file name and recording directory click the OK button of the file dialog The recording then starts the time indicator and Pulse Count indicator will start incrementing While recording the data graph is not updated The Progress slider will Te until the file usage given in kB has reached the maximum size parameters or the Halt button is clicked d Note Several antenna scans are needed to extract a correct HPD Therefore a proper recording will typically take from 30s to 60s depending on the antenna rotation speed IE UM 00171 002 DTI529 RASS S Tutorial odt 19 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 Tip When you are working in the field it is in your best interest to save two other recordings the destination folder has to be changed one with a trigger level that is 5dBm higher than the selected one and one with a trigger level that is 5dBm lower This is very important if several radars are visible then it becomes difficult to select the optimal trigger level Later analysis will prove which trigger level was the best one 7 Once the recording has been made the data can be viewed using the view B button Clicking this button will evoke the View RFA pulses window allowing you to view the recorded pulses and to extract the antenna diagram this is explained later
44. for basic viewing during the recording the Sectorial Viewer is more analysis oriented and therefore provides an XY view of the video data The following data is shown e Video Display consists of a Range Azimuth view of the selected video signal which is displayed in an intensity graph The range reference is selectable from different interrogation types as found in the recording e Timing The interrogation signal trigger is analyzed during an indexing stage and processed in order to detect the known interrogation modes according to Annex 10 timing The different modes are categorized and provide a range reference selection for the video display The Interrogation View window displays the timing of the detected interrogations Obviously the ARP ACP timing is used to Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 calculate azimuths e X View Y View An X View and a Y view window are available to view the video signal as it is sampled sliced at the position of the Video Display cursor either in X or Y direction e Reply Info The video data is decoded into A C S replies The detected replies are then linked to the corresponding interrogation This information is displayed in the Reply window in textual format 5 4 1 Getting Started The Sectorial Video Viewer tool can be opened from the Video CS is called View Sector Recording in the list E Sectorial Video Viewer 128MB Files BEER CH1 Video lt us 1235 5
45. frequency 3000 0 ES 60 000 100 000 Comment 000 1 1 1 1 1 1 1 1 1 1 1000 0 1200 0 1400 0 1600 0 1800 0 2000 0 2200 0 2400 0 2600 0 2800 0 3000 0 MHz Rx Bandwidth calc ana ci a Le ea es RE eae Figure 24 Rx Bandwidth Calibration software Make the connections as shown in Annex 2 Rx Sensitivity and BW Sweep Measurements Connection Diagram 3 2 2 Performing a BW Sweep Measurement The software will ask to load the correct receiver calibration file This is necessary to be able to calculate the exact power level corresponding to the measured pulse amplitudes This can also be done using the Load Rx Calibration L button The selected calibration file is then displayed By clicking Cancel in the file dialog it is possible to select a default table in case no receiver calibration file is available Use Slope and Offset to change the default table to your needs 1 Set the Attenuation value to 30dB receiver inputs of the DTI529 are 30dB couplers 2 Set the Center Frequency to 1090Mhz the Frequency Sweep to 200MHz and the Frequency Step to 0 1MHz 3 The Calibration Pulse field continuously monitors the signal available on the Ch2 video input at the selected frequency You can control the frequency directly by adjusting the Tx frequency control and check the pulse shape and amplitude available IE UM 00171 002 DTI529 RASS S Tutorial odt 31 71 i Didactical Test Interrogator
46. generated with the RFA641 the result can be viewed in the Sectorial Video Viewer as shown in figure 49 The following figure shows the RFM target in the Sectorial Video Viewer the SUM and OBA signals were connected to the RIM782 in this example and are shown in the X Y Video display at the bottom of the Sectorial Video Viewer software This example shows that the quality of an antenna can be checked using the RFA641 as a RFM in the field Sectorial Video Viewer RFM3 File Edit Window Help DPE CH1 Video Video v Range Nm 76 6 ADUS E Te vadi 74 5 74 0 Au H tein 720 allze deg 71 2 e I l l l l l l l l l l 1 170 00 172 00 174 00 176 00 178 00 180 00 182 00 184 00 186 00 188 00 190 00 191 61 0 01 0 50 1 00 1 50 200 Azimuth LA SA Azimuth WO Range Y U dR SR Range Reference AIC w 1 RM aL chi E Amplitude Il ES ja 179 63 73 42 0 63 Address Filter D ru an G XTY Video v Color Map Recording Info gt y x Video v Gray S L STN Vi TE apnyjduy 0 40 Az lt gt deg 0 60 249 4 0 80 Timestamp 19 18 05 de 23 02 2010 Geen ea Start Range Nm 166 8 170 0 172 0 174 0 176 0 178 0 180 0 182 0 184 0 186 0 188 0 190 0 191 6 12 0 Spares ideal Gm 1 6 L K du A End Range Nm Stop Az deg 360 Wr ey x desl E k Ch2 76 6 e ACPR 4096 Recording Scan 21 Ready Figure 49 Remote Field Monitor result i
47. gt P2 bon dB Radar Parameters Altitude d 12000 Im Antenna Gain SSR dB Ox Osr Tx Power SSR 1 10 0 dBm Range delay 0 0 us 1 2 50 75 100 125 150 175 200 225 256 Nm a Tx G 0 00 dBm dh 9 Target Return 10 0 0 0 dBm Radar Maintenance Unit n L D k RFM E joo lip Path loss gt foo d6 RFM Tx Power Son dem Target pwr Ion d6m Auto update M Figure 46 Remote Field Monitor software Make the connections as shown in Annex 8 Sector Recording with RFM Connection Diagram The RFA641 is connected to the antenna using a 20dB coupler ZFDC 20 5 The interrogations received from the antenna are injected in the input port of the coupler The coupler port is connected through the YIG filter to the transceiver Rx port RFA641 Set the DTI529 switches as follows e Encoder 12 bit e Motor 4 sec e SLS ON e Mode A C e Tx ON e Antenna Secondary IE UM 00171 002 DTI529 RASS S Tutorial odt 51 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 6 2 Remote Field Monitor Software 1 Fill in the parameters as shown below gt Remote Field Monitor vi amp E RFMSetup Parameters Mode Fixed Target 7 RFM Parameters m TruerangeRFM 1000 0 m B RFM Antenna Gain kon dB Target Setup 1Code b 12 Transponder Pwr 64 00 dem 2Code Kl 1234 Target Range OO Nm w RFM Tx Gain En Tei RFM Rx Attenuator bo d8 A C
48. imulator 4 20dB coupler ZFDC 20 05 YIG FILTER ennen D RFAGA1 ELECTRONICS RIM Front ANALOG LE L p Q G RADAR INTERFACE MODULE RIM782 IZ CZE QO Chi out Ch2 in RIM Back USB Connection with Computer Power Connection USB Connection with Computer Power Connection Figure 64 Sector Recording RFM Set up with DTI529 IE UM 00171 002 DTI529 RASS S Tutorial odt 68 71 Didactical Test Interrogator DT1529 9 9 Annex 9 RIM782 Data Recording Co e Antenna Rotation Simulator Intersoft Electronics Power El Ee tt Test Interrogator T1529 8 Encoder D 12bit 14bit Motor emm E E 4sec 8sec Transmitter Trigger VRAA E HOS SInDOW SQOld ZEZSU j On SINDOW OQOld ZEZSU aM Front as er INTERFACE MODULE IM Back mam TTC CO GO O rma Li B RASS Seria data Differential ACP1 ARP1 At d U Tigger 1 CH3 Video CH1 Video Video fo Seria data2 Differential ACP2 ARP2 A 9 G Tigger 2 CHA Video CH2 adeo Video USB Connection with Computer Power Connection Edition Date 03 Jan 13 nnection Diagram Power from external power supply or RASS equipment Figure 65 Data Recording Set up with DTI529 and RIM782 IE UM 00171 002 DTI529 RASS S Tutorial odt Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 9 10 Annex 10 UDR600 Data Recording Connection Diagram e Antenna Rotation Simulator
49. indow Help 4 Rm Conversion Line selection Info Source HDD Line 1 EDR Recording ze ROR Line 2 Message ROR Line 3 Rev ROR Line 4 Time 00 00 00 000 RER Line 5 Date ODIMM YY ROR Line 6 Current Destination Selection Display Error RASS 54 file S SE Li PPI Progress End scan das ll a e i Figure 54 Convert Radar Data software The recorded serial data can be converted to another format using the Convert tool The convert program also allows you to see the data in a PPI or Hex format This comes in handy to check the conversion process while it is being performed 1 Load the recorded file Source file using the Select Folder Ml button and select destination file using the Browse Folder button 2 Open up the Preferences window using the Preferences button to check the settings of the recording and to set the conversion settings Click OK to return to the Convert program 3 Select the line to be used as source for the data convert If multiple lines are checked the converted data from those lines will be merged into the same output file 4 When the BZ button is clicked the user can see the converted data in a PPI display In fact the Inventory tool is opened when the PPI button is clicked more information regarding the Inventory tool can be found in the Data Analysis User Manual L 5 Use the Stats button to view the converted data statistics such as number of messages number of e
50. input power table Before performing a Rx measurement set the DTI529 switches as follows e Encoder either setting e Motor either setting e SLS ON e Mode A C s Tx OFF e Antenna Secondary 3 1 Rx Sensitivity Measurement 3 1 1 Getting Started The Radar Rx Calibration is loaded from the RASS S Toolbox using the rex lll button if Receiver Calibration vi File Edit Operate Tools Window Help Beer a o 5 r RF V tog Rec Calibration B TS dB Sree f Power Step 0 1 dB onoff O Tx Frequency 1090 0 MHz r Triggering Delay after Trigger 1500 Ju onjo O Timeout 10000 Jus Order Pulse Width _100_ us MSE 5 0E 0 Delay after Pulse 0 Ju r Filter r Calibration pulse v Amplitude Mean 2 y woe us N I 1 1 1 1 I CG 0 10 20 30 40 50 64 Ae Soo dBm I 1 96 1 Tx power dBm 14 7 view DA 0 25 110 um op on 70 op D um ar Cursor og dem 0 000 v RB Im ae Cursor E10 00 dem 0 108 lais r Comment lt Figure 17 Rx Calibration software Make the connections as shown in Annex 2 Rx Sensitivity and BW Sweep Measurements Connection Diagram IE UM 00171 002 DTI529 RASS S Tutorial odt 26 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 3 1 2 Performing a Rx Sensitivity Measurement Once the tool is running the calibration pulse is shown in the Calibration Puls
51. inside the zoomed area while the bottom part shows the timing pattern stagger pattern of the selected pulses gt View timing vi Holdoff us Filter Holdoff x a e Copy j Info i Sul TAI ll RAE talis RRR ER gl lu din PRF 488 29 Hz AN Uu Lu AN i H r IN aT lu 1 IN Tu di d Wil It l ft uff UI eene A A L l HL A A U A ID Min period 1920 00 ps dP WI 1870 1 1 ei ey SU ky pa IE ea I BIZ se Figure 12 View timing window Stagger pattern 5 Ifa repetitive stagger pattern can be found by the software The pattern and the stagger copy to the left and right will be shown in the lower graph in blue In that case the cursors will automatically be put at the correct positions Simply click the Return button to close the Timing window If no pattern can be found automatically The user must find the repetitive pattern himself by selecting a number of periods from the bottom graph and clicking the Copy button the stagger pattern is copied into the programs memory and can be used to extract this radar s pulses and discriminate them from other radars Afterwards simply click the Return button to close the Timing window After returning to the main vi it is best to rescale the graph first I View RFA pulses vi iG Awe EE dBm le 10 05 15 0 20 0 25 0 30 0 35 05 40 0 45 0
52. interrogation timing of that radar must be known The first step is to select a set of pulses of the radar under test The easiest method to do so is to select a horizontal portion of the SLS pattern using the zoom tool In the example shown in Figure the two red selections are not correct The right red selection has a gap so a false period will be measured The red selection to the left does not contain enough data The green selection is an example of the way selections should be made d m 10 0 Pi 15 0 d P3 S ch e Pulse 20 0 f SUM 22 5 j SLS 27 5 Y V 30 0 f 0 EE A GC Zi 3510 GGA ai Se Last 37 5 Si f ra Zu 7 SZ SP LZ OF 40 0 7 Ai Sa KC ae GK i S Se 42 5 ST ZS GE AP D Se A a F WA i Ka ars mpi wy A V EN ah pA vie z EG Ais A if d b p t f N hre L A N A a T teti F f t d a F 1 ER uFi G diua dr bad dad YT eal i ami I l l l l l l l l l l l l l l l l l l l l l 1 558 2 200 2 400 2 600 2 600 3 000 3 200 3 400 3 600 3 600 4 000 4 200 4 400 4 600 4 600 5 000 5 200 5 400 5 600 5 600 6 116 Figure 11 Selection of pulses to determine interrogation timing IE UM 00171 002 DTI529 RASS S Tutorial odt 21 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 L 4 Once the pulses for determining the stagger pattern are selected zoomed in click the Stagger Pa button The View Timing window will pop up The top graph will show all pulses that were located
53. l odt 18 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 s Transmit program controls the transmission for the Downlink measurement The Transmit program is used to transmit pulses or CW using the REAS transmitter for Downlink purposes 2 Before starting a recording first select or create the destination folder by using the Find Folder button When clicking this button a folder dialog will appear asking you to select a folder to store the recordings By default the folder dialog will open with the RFA subdirectory of the MSSR or PSR subdirectory of the active campaign folder as the starting point In case you want to create a new folder click the New button enter a file name and click Create Click Select and the desired folder is selected or created The File indicator of the Radar Field Analyser program will show the complete destination path for the pulse recordings followed by one File A CAMPAIGN 56DEMOUMISSRIRFAL gt TEST none Figure 8 Recording path 3 Set the trigger level correctly to avoid noise Radar Field Analyser vi z Receiver SE EE Max widths 1 00 oo Sie Window eae speed Progress C File usage O kb WE Gm et mme 0 0 e H SLAD Pulse count 2616 Figure 9 Uplink measurement 6 Click the U Record button to start the recording A file dialog pops up pointing to the selected destination The file path indicator will always reflect the lat
54. libration file WinQOW ccsssccsseccsseeesnnesesnneneannsesansceenesenanssseassesansneanesenanes 42 PIQUIC 36 SOCOM WVHA Le E 43 Figure 39 Downlink example of Didactical Test Jnterrogatoar SEENEN es eee eee E E E EN En 43 Figure 40 DOWMINK HPD Te 44 Figure 41 Outbeam Interference Generator software left and Sector Recording software right 45 Figure 42 POWEP amp Rate SClRUD D 46 Figure ER TEE L 47 Figure 44 Sectorial Video RECOlQING EE 48 Figure 45 Sectorial Video Viewer example ssc ss sees ece ss cesse ec es eee eee eee nnmnnn 49 Figure 46 Remote Field Monitor sSofware cssssss cesse cesses eee eee 51 Figure 47 Remote Field Monitor Exvample SEENEN esen ee 52 Figure 48 Remote Field Monitor Example RFM Setup Tab esse c esse cce c ces c ecce e eee eee 52 Figure 49 Remote Field Monitor result in Sectorial Video Viewer software cesses sees ecce e ENNER 53 Figure 50 UDR e TE te E 54 Figure 51 UDR TT E EE 55 Sey E UM 00171 002 DTI529 RASS S Tutorial odt 7 71 Didactical Test Interrogator DT1529 Figure 52 Figure 53 Figure 54 Figure 55 Figure 56 Figure 57 Figure 58 Figure 59 Figure 60 Figure 61 Figure 62 Figure 63 Figure 64 Figure 65 Figure 66 Edition Date 03 Jan 13 EXD FOP DOL sa oo cates ees 56 II OC ONIN EE 57 Convert Radar Data SOLE WAN EE 58 Hexadecimal display of Converted data sss 59 Result of a Data Recording using the DTI529 and the UDR600 1c
55. lities without the need to have a radar available The DTI529 can be powered up with the use of one of the RASS S instruments or from an external power supply The user of the DTI529 needs to know how the simulated rotation is applied On the circuit board in between the couplers and the antenna connector four modulators are controlled to mimic the antenna characteristics for uplink downlink and STC At all three receiver channels STC is applied for short range aircraft 650us or 53NM Due to the high PRF of 488Hz the maximum range is limited to 150NM 1 2 Technical Specifications Table 1 Technical Specifications RF frequency 1030MHz Min RF output power 1dBm PRF 488Hz Revolution time 4 2s or 8 4s ACPR 12 bit 14 bit 4096 or 16384 Dynamic range of interrogation pulses Min 18 dB POWER SUPPLY Supply voltages 12V 15V 12V 15V Operating current Less then 200 mA on each supply voltage IE UM 00171 002 DTI529 RASS S Tutorial odt 11 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 1 3 Block Diagram Antenna W i ACP Q ARP Q9 i OS m Z Trigger amp LOG LOG LOG E Le ES lt L OBA OBI gt vid A vid Q vid EEPROM Lei 8 Dig 2 Dig 3 E 1 Uplink antenna modulation 2 Trigger Interrogation modulation 3 1030MHz oscillator 4 STC SUM Downlink antenna modulation Dig 4 QF vid 5 Monopulse processor 6 STC DELTA Do
56. lue for the attenuation s Disconnect the trigger e Use the wrong video output Q What are you measuring IE UM 00171 002 DTI529 RASS S Tutorial odt 30 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 3 2 BW Sweep Measurement The Rx Bandwidth measurement consists of a frequency sweep The RFA641 transmitter is set to transmit a pulse at the specified power value and the frequency is swept between two chosen limits The RFA641 continuously samples the output of the radar receiver video signal and uses these values to build a dBm versus frequency table The resulting bandwidth graph can be analysed to determine the 3dB and 10dB bandwidths of the receiver 3 2 1 Getting Started The Radar Rx Bandwidth software is loaded from the RASS S Toolbox using the rex ll button Bandwidth Calibration vi File Edit Operate Tools Window Help EE ees Tele The Teal rot running dB Rx Bandwidth Calibrati Frequency Power Setting x Bande ration s o ae Attenuation dB 0 000 Sweep 30 00 Iw r og Step MHz 67 1 TxPower 14 9 dBm 10 000 r Triggering Procedure Delay after trigger US 20 000 x ET us Dynamic Pulse Width us OStatic 30 000 Delay after Pulse po Ju r Calibration pulse Amplitude y 40 000 50 000 60 000 70 000 us Kat 1 1 1 1 1 1 0 10 20 20 40 DU c SL ou MHz 90 000 7 1000 0 Tx
57. m Delta and Omega will be disabled until the next ARP occurs IE UM 00171 002 DTI529 RASS S Tutorial odt 38 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 3 Before starting the measurement it is important to check the position of the output pulse and the setting of the sampling point Click the Preview W I button to open the Preview STC vi window i Preview STC vi L S pe Figure 30 Set sampling point of test pulse Use the cursor to set the sampling point for the pulse amplitude Once set click the Return button to return to the sectorial STC measurement program 7 Click the SUM button A dialog box will prompt the user to check the connections of the different channels to the back panel Ch2 and the Tx of the RFA641 Confirm the connections by clicking the OK button ake sure the Sum channel video is connected to Analog input Chi of the RFA Backpanel and the Tranceiver Tx output is connected o the Sum MjSSR RF input using the antenna able and the apropriate attenuator Figure 31 Verifying the connections 8 Upon the ARP following the start of the measurement the PPI Graph containing the sectorial STC map is updated with the measurement result for the full revolution at once 1 1 1 1 1 1 1 1 1 1 502 400 300 200 100 0 100 200 300 400 502 Le 502 Figure 32 Sectorial STC result By default the Z scale color is auto scaled on the minimu
58. m and maximum of the loaded receiver calibration file The auto scale pad for the color display also contains a Z axis auto scale button to IE UM 00171 002 DTI529 RASS S Tutorial odt 39 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 allow auto scaling on the Z axis for the selected zoom in X direction and Y direction Figure 33 XYZ Graph Controls lf wanted you can set the color scale manually in the Z co or scale control A red cursor is available in the Sectorial STC graph to allow selecting an azimuth The STC curve for the selected azimuth is then displayed in the STC time graph at the right side of the software vi Range azimuth and power level of the selected point are indicated in the cursor readout 9 When the channels STC curve is measured click the Save button to save the measurement data to disk The data will be saved as an S4 plot file containing one scan with a plot for each measurement point The following plot information fields are filled in Range Azimuth Power level Time and Scan Nr This data file can be viewed using the 3D View function of the Inventory as explained in the RFA641 User Manual The VI will prompt a standard file dialog by default pointing to the RESULTS subdirectory of the active campaign folder Type in the desired file name and save the data on disk 3 4 3 Typical Result A typical result of a Sectorial STC measurement after rescaling the Z color scale control ca
59. metimes just running the Downlink or the Sectorial Video Recording software is enough to trigger the timing signals To perform the data recordings the user should use the instructions of section 8 2 IE UM 00171 002 DTI529 RASS S Tutorial odt 54 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 8 SerRIAL Data Recorpinc UDR600 8 1 Getting Started button on the RASS S toolbox The Serial Protocol Recorder tool can be opened from the Serial Data Z The UDR Control vi will be opened i UDR Control vi File Edit Operate Tools Window Help Recording Size 0 kb Time 01 00 00 UTC 11111904 UCR Status tn m al l I I UDR serial Nr o i R 0 00 deg Connection e L UE Figure 51 UDR Control software Make the connections as shown in Annex 10 UDR600 Data Recording Connection Diagram 8 2 Performing a Serial Data Recording The Didactical Test Interrogator produces 4 different data formats on its four RHP Simulator ports 1 2 3 and 4 these 4 data formats are listed in table 2 on page 14 1 The UDR600 has a factory default transport layer protocol configuration Yet at any time the UDR600 can be reprogrammed by the user to any of the following transport layer protocols HDLC SYNC 13 AIRCAT LINK Now reprogram the UDR600 transport layer protocol if necessary by clicking the Reboot lil button and following the instructions
60. n Sectorial Video Viewer software IE UM 00171 002 DTI529 RASS S Tutorial odt 53 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 7 Ser aL Data ReEcorpinc RIM782 Make the connections as shown in Annex 9 RIM782 Data Recording Connection Diagram As soon as RASS S detected the UDR inside the RIM782 the following message will pop up UDR Reboot tool vi One or more UDR bypee devices are detected They can be reprogrammed For use with RAS5 5 Tryour DC ask to install drivers proceed as instructed by your operating system TF you want to use Hem later with RaS5 R please unplug them From USB For a short while Cancel Figure 50 UDR Control software Click OK and follow the on screen instructions to reboot the UDR type 2 RASS R inside the RIM782 to a UDR type 1 RASS S The UDR inside the RIM782 will now behave in the same way as a normal UDR600 One more difference with the normal UDR600 In case you connected the timing signals but the dial of the data recording tool is not rotating check whether the RIM782 is using the correct timing signal channels 1 Connect the USB Video port to the computer the setting of the timing signals is done by the video board 2 Open up the Downlink tool see also chapter 4 3 3 Verify the settings of the timing selector ACP ARP When the selectors are set to the channels to which you connected the timing signals the dial should be rotating So
61. n be found below gt Sectorial STC vi Rau a Lee Power Setting 558 ITI TTTR Attenuatio 30 d6 500 Ki 7 fl ET i l 74 1 2 7 dBm __ Tx Frequency 1090 0 Mhz r Timing Start Delay us Stop Delay us sectors aI E a 60 0 62 5 65 a et RAR 1 1 58 0 50 0 RENE A male e La S Figure 34 Sectorial STC Sweep Result IE UM 00171 002 DTI529 RASS S Tutorial odt 40 71 ri Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 d Down tink ANTENNA MEASUREMENT The Downlink measurement enables the user to measure the HPD antenna pattern at reception The RFA641 is set up in the field as the RF downlink source transmitting SAM Synchronous Amplitude Modulated pulses The test pulses are then measured at log video level at the output of the M SSR or PSR receiver using the RIM 82 The measurement uses a sampling window which is selected by the user In this sampling window the software determines the mean amplitude of the CW signal or synchronous pulses received from the uplink field setup The sampling window can be shown at all times continuously updated with the sampled data The measured amplitudes are then converted to the received RF power at coupler level using the receiver calibration file The receiver calibration file is a table describing the radar receiver output voltage vs the RF input power and needs to be measured before the downlink
62. n the field from this point the antenna pattern becomes visible s RF couplers gt A QO These couplers in the antenna chain sample the interrogation signal or inject test pulses The couplers are located at the end of the low loss cabling from the rotary joint to the receiver The input range has to be measured with a receiver calibration but the input power must not exceed 10dBm As an input the coupler of the gt channel is the same as on the A and Q channel But this bi directional coupler also outputs the interrogations that are transmitted on the gt channel e Trigger Outputs the interrogation pulses of the main beam at TTL level P1 P3 e ARP Outputs the Azimuth Reset Pulse North mark pulse e ACP Outputs 4096 or 16384 ACP s per revolution depending on the encoder selection 1 4 4 Monopulse Receiver Section e OBA Stable OBA curve between 20dBm and 40dBm e OBI e 5 A Q video channels IE UM 00171 002 DTI529 RASS S Tutorial odt 13 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 1 4 5 RHP Simulator Section e Q quantized video channel s Data channels 1 2 3 4 Table 2 Data Channels of DTI529 Channel Data format 1 EUROCONTROL 2 ASTERIX CAT34 48 3 AIRCAT 500 4 RDIF 1 4 6 Illustrative Example LS Third gien vi E l RME Power dBm Not defined Power d6 mn F Range 44 SS File Edit E Project Windows Help Lag SE rt glan zs Z
63. ode Reply if P1 P2 bm d8 Radar Parameters Altitude Kl 12000 Tm Ameena can 32 EE 25 Ox Ose Tx Power SSR ZT 10 0 dem Ger D Ka ba U 1 25 50 75 100 125 150 175 200 225 ma a Tx G 197 00 37 00 _ dem Target Return 51 5 d8m Radar Field Analyser w 7 RFM Rx 56 2_ d8m Path loss gt 93 2 _ d8 RFM Tx Power 9 19 3_ dem Target pwr Les lidel Auto update Figure 47 Remote Field Monitor Example 2 Next hit the Play LE button the target will be generated and detected 3 Switch to the RFM Setup tab you will see detected pulses similar to an uplink antenna diagram gt Remote Field Monitor vi OH x RM Rumningiarget Generated RFM Setup EE Mode _ s FixedTarget Trigger Counters Trigger Count Lei e 6 6666 6 6 6 666666 66 6 66 666 666 66 666 666 666 66 666 66666 666 66 66 6 666666 o 6 6 6 6 6 66 oo IE UM 00171 002 DTI529 RASS S Tutorial odt 52 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 4 Set the trigger level such that you see a diagram as shown above typical 60 to 70 dB Increasing the trigger level will reduce the number of detected interrogations from the DTI529 Now the RFA641 setup as PARROT is generating a static target More information regarding the RFM software can be found in the RFA641 User Manual 6 3 Exercise The user is advised to use the Sectorial Recording tool to record the static RFM target which is
64. oise level of the receiver when no signal is sent from the uplink side disconnect cable at RFA641 Tx connector The two or single channel s to be recorded can be selected with the parameters on the Downlink front 2 A Q are respectively shown in red blue and green E Device Radar Type biz 97 03 36 CST dch PSR Analog Input 1 Analog Input 2 SL DELTA C OMEGA CHI Video v CH2 Video v Timing Encoder Trigger ACPL ARPI Triggeri se Calibration File me AY YY CAL_080619DTI RIM CAL d i A U U y l A d 1 i Info Ring Settings rings a gl Absolute dB ring is Co Relative Quber Ring Lon Log Offset 0 Graph Pallet Counters Inn acpplamgg JI o IPR a203 ARP 24 Running Figure 39 Downlink example of Didactical Test Interrogator IE UM 00171 002 DTI529 RASS S Tutorial odt 43 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 5 Start recording using the Record el button 6 When the recording is stopped Stop m button a dialog box will pop up to select a logging file The software will suggest a default file name Downlink yyyymmdd time One can also save the data to file using the Save button 4 4 View HPD Logfiles To view the measured antenna diagrams RASS S contains a universal tool called View HPD Logging The program is capable of reading recognizing and displaying Uplink and D
65. on 2 4 RFA Data Analysis Create HPDs from a Pulse Recording 2 4 1 View Recorded Pulses 2 4 1 1 Getting Started The View RFA Pulses window shows the pulses as they were recorded in time A measurement using the RFA641 should contain at least three revolutions of the antenna pattern but preferably more are used By selecting a boresight and defining the stagger timing in that boresight the user can extract the fingerprint of the specific radar under test After this fingerprinting the software will deal with extracting the different HPD curves from the recorded pulses The View RFA Pulses tool can be opened from the RASS S Toolbox using the Uplink 03 View Recorded Pulses button select E View RFA pulses vi File Edit Operate Tools Window Help g ESTEE T Be _ dBm 00 i ee DD 0 5 EI HEH HEH EU CHE HEH 10 0 raug arr shon J DEJE eal L I d Scope D bz Ja 18 freshold JE70 0_ f90 0_ d LIL fo r Set Up Inde r In x dB Pulses scope 7 20 04 ulses ssp Filter a1 40 0 ars O 4 1 60 0 Sei UE va ST E DT 100 0 1 1 1 1 1 1 1 1 1 aki TTT IIE Figure 10 View RFA Pulses software 2 4 1 2 View RFA pulses Extracting the HPD Diagram 1 Select the measurement type SSR or PSR in the Set Up field at the bottom of the window and click the Load button A dialog box will pop up You will be able to sele
66. onnection Diagram The software will ask to load the correct receiver calibration file after you have started the tool This is necessary to be able to calculate the exact power level corresponding to the measured pulse amplitudes This can also be done using the Load Rx Calibration L button The selected calibration file is then displayed By clicking Cancel in the file dialog it is possible to select a default table in case no receiver calibration file is available Use Slope and Offset to change the default table to your needs 1 Make sure that the STC mode is selected selector in the top right corner of the vi 2 Enter the proper amount of attenuation and take into account that the antenna jack on the Test Interrogator is not a 30dB coupler In order not to saturate the low noise amplifier in the front end it is best to use 50GB of in line attenuation In order to get an optimal result for the measurement on the test interrogator the default parameters should be adjusted to the following values o Attenuation 50 dB o Pulse width 20 microseconds o Start delay 50 microseconds o Step 1 microsecond o Stop delay 560 microseconds stop before the Downlink simulation starts The Calibration Pulse field continuously monitors the signal available on the Ch2 video input at the selected delay Set the cursors at the beginning of the pulse 3 Click the Sum button to measure the gt channel The spikes you might notice are sector
67. ore information regarding the parameters can be found in the RIM782 user manual 3 Sectorial Video Viewer The user is advised to experiment on his own the different settings of the Sectorial Video Viewer software More information regarding the parameters can be found in the RIM782 user manual IE UM 00171 002 DTI529 RASS S Tutorial odt 50 7 1 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 6 Remote Fietp Monitor Function RFA641 The following section will explain the RFM functionality of the RFA641 the user is afterwards advised to use the sector recording tool to make a recording of the RFM signal The Remote Field Monitor function consists of a programmable transponder function capable of supporting Mode 1 2 3 A C interrogation modes The software supports to set up a fixed target or a target following a programmable radial scenario 6 1 Getting Started The Remote Field Monitor function is loaded from the RASS S Toolbox using the RFM E button in the list the function is called RFA amp RMU Remote Field Monitor for SSR i Remote Field Monitor vi SEE File Edit Operate Tools Window Help Bama RFM Setup Parameters Fixed Target RFM Parameters Target Setup True range RFM ho Ted RFM Antenna Gain 10 0 Top 1 Code o 7000 Transponder Power dBm A x a RFM Tx Gain b4 0 oe 2Code o 7000 Target Range 10 000_ Nm ei RFM Rx Attenuator dB A Code o 7000 Reply ifP1
68. ownlink HPD logfiles of both M SSR and PSR measurements 1 Open the View HPD Logfiles program from the Downlink button on the RASS S toolbox 2 Use the Load lai button to select a downlink logfile select the file of interest and click the OK button The selected file will be displayed in the active layer and its file name will be presented in the Layer info sub window the date and time of the recording is shown and diagram parameters of the selected logging are displayed gt View HPD Curves vi leie IE Bees ele ssn pownink O Sum Delta WS v PR 2 AS e A Wh l d i 40 0 1 1 1 1 I 1 1 I I 1 I 1 I 1 1 I 1 s 180 00 160 00 140 00 120 00 100 00 680 00 60 00 40 00 20 00 0 00 20 00 40 00 60 00 80 00 100 00 120 00 140 00 160 00 180 00 UE AS s e H Di el si BK fed bas Teta 2 Jas m e H D_Down ssr J 2 3 J d J 5 j zeen T O B O B oO H O lei MBoresight adjust MA Relative L Filter L Back lobe m Index Date Time 3dB beamwidth 10dB beamwidth Sum Delta Crossovers Sum Omega Crossovers 0 5 31 2007 10 18 51 Ak 2 56 deg 4 55 deg 18 69dB 2 77 deg 18 58dB 2 81 deg Figure 40 Downlink HPD example 4 5 Exercises Find out what happens when you e Switch the Tx type in the Uplink software to SAM pulses s Connect ACP as trigger PSR trigger IE UM 00171 002 DTI529 RASS S Tutorial odt 44 71 i Didactical Test Interrogator DTI529 Edition Date
69. quality of the curves click the Spline button The HPD graph will be splined using a cubic spline routine IE UM 00171 002 DTI529 RASS S Tutorial odt 23 71 i Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 11 The HPD curve will now require a detailed evaluation This can be done automatically using the OTD button which will invoke the following window les CalcOTDparameters vi 2 HPD Type OTD Definition File SSR Uplink Antenna Parameter Calculation COTO Calculated Antenna OTD Limits Antenna Parameter Sum 208 Beamwidth deg poret f pwo Sum Mean Sidelobe Level dBm 49 40 Sum Mean Backlobe Level dem 50 22 Il Powerte JL L n Ooo ST T MGE WE Lk WE E Omega Notch Depth dem Power de 24 0 Power de Lo Dem SECHER a Sid fos Mean SLS Level dBm 32 94 TG ee A EE oo o ee ll WE ee D Relative OTD Error um 306 Bearmwidth outside spec Outside 27 10 2 70 deg um 1006 Beamwidth outside spec Outside 3 80 4 20 deg Urn Omega Crossovers outside 16 00B 3 06 1 Punchthrough Figure 15 HPD Out of Tolerance Data 12 The curve can now also be logged to disk and reviewed later using the View HPD Logfiles function from the Radar Toolbox Use the Save button to evoke the Log panel If no logfile has been selected yet Open an existing logfile with the Open logfile button or create a new logfile with the New Logfile button In both cases a file dialog will appea
70. r After selecting a logfile a new or an existing one use the Add logging button to add the current data If a logfile has already been selected the logfile string indicates the selected file name Use the Add Logging button to append the current data to the logfile 2 4 2 View HPD File To view the measured antenna diagrams RASS S contains a universal tool called View HPD Logging The program is capable of reading recognizing and displaying Uplink and Downlink HPD logfiles of both M SSR and PSR measurements The View HPD Curves tool can be opened from the RASS S Toolbox using the Uplink i button select View HPD Logfiles IE UM 00171 002 DTI529 RASS S Tutorial odt 24 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 gt View HPD Curves 2 vi File Edit Operate Tools Window Help e Hit Wwe SIS Ba 40 0 d 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 deg 10 00 9 00 8 00 7 00 6 00 5 00 4 00 3 00 2 00 1 00 0 00 100 200 3 00 400 500 600 7 00 800 900 10 00 11 00 TEF HO fed GZ Leiaz Jas mi e 4 Eurocontrol OTD p Index o o G dai Ltb gt Boresight adjust MA Relative J Filter L Back lobe fC mmm DI U2 7456389 No File Name Index Date Time 3dB beamwidth 10dB beamwidth Sum Delta Crossovers Sum Omega Crossovers Figure 16 View HPD Logfiles program Use the Load button to select a logfile select the file of interest and cli
71. rements of the Omega channel Disconnect the BNC BNC cable coming from the Analog Ch2 in connector at the back of the RFA641 at the A connector and connect it again to the Q connector The previous step 4 can now be repeated for the Omega channel 5 When all channels are measured click the Save button to save the measurement data to disk The VI will prompt a standard file dialog by default pointing to the CALIB subdirectory of the MSSR or PSR subdirectory of the active campaign folder Type in the desired file name and save the data on disk or select Cancel if you do not wish to save the results IE UM 00171 002 DTI529 RASS S Tutorial odt 35 71 i Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 3 3 3 Performing a DSTC Sweep Measurement Make the connections as shown in Annex 4 DSTC Sweep Measurement Connection Diagram The software will ask to load the correct receiver calibration file after you have started the tool This is necessary to be able to calculate the exact power level corresponding to the measured pulse amplitudes This can also be done using the Load Rx Calibration L4 button The selected calibration file is then displayed By clicking Cancel in the file dialog it is possible to select a default table in case no receiver calibration file is available Use Slope and Offset to change the default table to your needs 1 Make sure that the DSTC mode is selected selector in the top right corner of
72. rrors etc IE UM 00171 002 DTI529 RASS S Tutorial odt 3 58 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 6 Check the Hex checkbox to view the hexadecimal display of the current conversion process Hex e ppd 0200 OBFO 7379 Weed FGF CA Figure 55 Hexadecimal display of converted data 7 Click the start LE button to start the conversion The progress bar will show the status of the conversion process The converted file is stored at the destination location and can now be further analysed Note When you selected the PPI button the data can be viewed in the Inventory tool You d need to load the converted file in the Inventory first by clicking the Load CC button as the Inventory does not display the converted date in a live manner 8 4 Data Analysis More information regarding the possible data analysis functions of RASS S can be found in the Data Analysis User Manual IE UM 00171 002 DTI529 RASS S Tutorial odt 59 7 1 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 8 5 Typical Result I s Ae x oo H v ooo ek 4 Codes M 80 100 120 h 7 S IER Track ao Power dem 0 0 k Rec Time 00 00 00 00 1837 l l l l i l I 221 700 100 125 150 175 200 719 Figure 56 Result of a Data Recording using the DTI529 and the UDR600 IE UM 00171 002 DTI529 RASS S Tutorial odt
73. s or CW using the RFA641 s transmitter As soon as the Transmit program is IE UM 00171 002 DTI529 RASS S Tutorial odt 41 71 Didactical Test Interrogator DT1529 Edition Date 03 Jan 13 selected the HPD_Preferences window will pop up this window can also be evoked using the Preferences button at the Downlink settings tab gt HPD_Preferences vi Downlink RFA Timing Tx Freq 1090 0 Mhz Delay after trigger us EE Cam Sliding window us ENN S SAM Holdoff is Sampling window 1200 p Filter SAM Width us Min pulse width us SAM Timeout us T se Tx Power san Recording If Ch1 Sum Jis gt InF_ dBm Log From deg to 360 0 deg Figure 36 Preferences window 2 Several settings can be changed such as the width of the pulses Tx power The Tx type selector can be switched between SAM and CW signals Change the Tx type to CW and click OK to return to the Uplink program 3 The Uplink program will show the transmitted signal and warn you of the fact that the RFA is now transmitting 4 3 Performing a Downlink Antenna Measurement using the RIM782 1 The first step is to load the receiver calibration file Click the Load Rx Calibration Table to be able to select the correct calibration file The calibration file is used to convert the measured voltages to the received RF power at coupler level When the user chooses not to select a Rx Calibration File the default curve will be used button
74. size used A time indication shows the current time The PPI indicator will show the radar timing information ACP ARP during the recording if connected This timing information is also recorded together with the serial data and can be used for analysing the data in a later stage 5 The Connection panel indicates the integrity of the recording for each of the channels and the GPS information individually if connected For each hardware channel and for the timing information GPS ACP ARP there is a LED display that indicates the general status of the recording for that particular channel o grey hardware channel NOT IN USE o red channel NOT OK o yellow intermitted failure o green the channel is OK Notice that a red or yellow LED does not necessarily mean that the recording has failed A poor line quality also results in a temporary red yellow light A green light indicates that the recording is functioning in an optimal way for the respective hardware channel The synoptic text displays more details of the current status of the recording For each channel the number of transmitted frames and the number of good and bad received frames are counted These counters are updated continuously during the recording During the recording the raw data is logged to disk temporary file displayed and updated in the Data Messages window Ee UDR Control vi Sie x Recording Size 60 kb Time 07 23 10 UTC 16 06 2005 UDR Status
75. t Interrogator DTI529 Edition Date 03 Jan 13 TABLE OF CONTENTS 1 DIDACTICAL TEST INTERROGATOR DTISa29 sss sssss senenn eenn 11 t1 ASG GIBI ces Let DEE 11 1 2 Technical SOC CHI CALI ONS EE 11 R OC 46 cT 12 1 4 Interface and External Connechors sss esse sees sees sese 13 ge NN eu ele EE 13 1 4 2 Operation Mode Gelectors 13 1 4 3 Signal Input Outputs of Antenna TX Gechon cece ee ee e 13 1 4 4 Monopulse Receiver Gechon 13 14 5 ln HE te le EE 14 14 6 MUS EPATIV GS EXAMI ei 14 2 UPLINK IG TITELE CHE 16 C Bela Star e H 16 ol O TTT e Ka TTT 16 2 2 1 Adjusting the Input Level sese eee ee eee ee 16 2 2 2 Adjusting the Trigger Level sese 17 2 2 3 Pulse Sampling Mechantem iniaiaiai aa aiaa R E aAA Raihia 17 2 3 Performing an RT UN ee Un DE 18 2 4 RFA Data Analysis Create HPDs from a Pulse Recordumg css cesses essen e 20 24 1 VIEW Recorded ET 20 2 4 1 1 Getting RE a E 20 2 4 1 2 View RFA pulses Extracting the HPD Diagram sese eee ee eee eee 20 2 4 2 View e RM E 24 Y FOP EE 25 3 M SSR PSR Receiver NIEASURENENTS ccc ec ec ee ee ee eee eee eee 26 3 1 Rx Sensitivity Measurement ccs sss s cesses sees esse e eenn enen neee 26 3 1 1 Getting x Ts ME 26 3 1 2 Performing a Rx Sensitivity Measurement cece eee e e eee ee ee 27 2 LS Typical I EE 29 SR EXE EEN 30 3 2 BW S9W6 p Measure ment T 31 S E Ts fee iE e ee 31 3 2 2 Performing a BW Sweep Measurement eee e ee ee eee ee 31 A e oh
76. tended for generation of out beam FRUIT and or CW interference scenarios After compiling the scenario is downloaded to the Radar Field Analyser RFA641 for injecting the interference signals in the RF section of the radar DT1529 The Interference Generator software is used to set FRUIT Type FRUIT Content and Power and Rate to select the characteristics of the out of beam FRUIT to be generated by the RFA641 The Interference Generator window has three tabs Fruit Type Fruit Content and Power amp Rate which can be selected IE UM 00171 002 DTI529 RASS S Tutorial odt 45 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 1 Set the following parameters in the Power amp Rate tab Interference _Generator_RFA vi Fruit Type Fruit Content Power amp Rate Distribution Radar Coupler Loss out sector in sector 12 00 0 00 Min dBm Min idem secirey Deg fF Figure 42 Power amp Rate set up The lock in the right bottom corner must be switched on in case the Interference Generator has to lock onto the ARP signal coming from the radar under test which is surely the case when a sector is used When the correct settings are made download the interference scenario to the RFA641 using 4 the Download button The scenario can then be started using the Play LE button and stopped using the Stop m button The Save button allows the user to save the scenario to disk such that the scenario can
77. the overall dynamic range Append On OFF of the receiver measurement To do this check the Append z button and insert a 20dB attenuator at the Rx input of the DT1529 Change the Attenuation parameter into 50dB and click the Sum button again The software will append the two calibration curves to each other The two curves match perfectly except for very low power v tog Rec Calibration Sum wm wm dBm 0 25 t t t t t 1 1 1 1 1 1 110 100 90 80 70 60 50 40 30 20 10 0 Figure 21 Rx Calibration Second Sweep Append function 6 Proceed with the measurements of the Delta channel Disconnect the BNC BNC cable coming from the RFA641 Tx connector and going to the 2 connector of the DTI529 at the 2 connector and connect it again to the A connector of the Test Interrogator Disconnect the BNC BNC cable coming from the Ch2 in connector at the back of the RFA641 and going to the 2 Receiver connector of the DT1529 at the 2 connector and connect it again to the A Receiver connector of the Test Interrogator The previous steps 3 to 5 can now be repeated for the Delta channel 7 Proceed with the measurements of the Omega channel Disconnect the BNC BNC cable coming from the RFA641 Tx connector and going to the A connector of the DTI529 at the A connector and connect it again to the Q connector of the Test Interrogator Disconnect the BNC BNC cable coming from the Ch2 in connector at the back of the RFA641 and
78. then displayed By clicking Cancel in the file dialog it is possible to select a default table in case no receiver calibration file is available Use Slope and Offset to change the default table to your needs The calibration file can always be reloaded afterwards using the Load Rx Calibration button 1 Enter the proper amount of attenuation and take into account that the antenna jack on the Test Interrogator is not a 30dB coupler In order not to saturate the low noise amplifier in the front end it is best to use 50dB of in line attenuation In order to get an optimal result for the measurement on the test interrogator the default parameters should be adjusted to the following values o Attenuation 50 dB o Pulse width 20 microseconds o Start delay 50 microseconds o Step 1 microsecond o Stop delay 560 microseconds stop before the Downlink simulation starts The program will synchronize to the ARP and interrogations of the radar The azimuth information is indicated in the PPI Pict window Once the number of interrogations per revolution IPR is constant the azimuth can be calculated correctly and the measurement buttons are enabled 2 The sectors parameter determines the number of measurements to be executed during one revolution In fact it acts as a divider for the IPR count so that each IPR sectors amount of triggers a measurement is performed Each time one of the measurement parameters is changed the measurement buttons Su
79. ulses SIC System Identification Code SLS Side Lobe Suppression a technique to avoid eliciting transponder replies in response to interrogations transmitted via antenna sidelobes SSR Secondary Surveillance Radar STC Sensitivity Time Control TX Transmitter Uplink Ground to air signal path UTC Coordinated Universal Time Edition Date 03 Jan 13 IE UM 00171 002 DTI529 RASS S Tutorial odt Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 1 DipacticaL Test INTERROGATOR DTI529 1 1 General Introduction This tutorial allows a novice user of RASS S to learn and experiment with the equipment performing a number of basic measurements of RASS In all cases the DT1529 or Didactical Test Interrogator will be used to substitute the radar s test signals The Didactical Test Interrogator has been conceived as a lightweight instrument developed to simulate the basic signals of a surveillance radar Except for the power aspect all the signals on the DTI are intended to mimic the behaviour of a surveillance radar In order to improve the degree of realism and with the user s comfort in mind the structure of the instrument also resembles the normal radar system s configuration an RF interrogator section and a receiver module with monopulse output Originally the DTI529 was developed to support the training of the Intersoft Electronics RASS S tools It allows the radar engineers to practice its main functiona
80. will be very fast and it is possible that you do not recognise an antenna diagram any more This situation should be avoided as well A correct setting of the Trigger level just above noise level is very important 2 2 3 Pulse Sampling Mechanism The RFA Uplink parameters influence the behaviour of the pulse sampling and detection mechanism A comprehensive explanation of the implemented sampling mechanism can help you to understand the parameters involved IE UM 00171 002 DTI529 RASS S Tutorial odt 17 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 By selecting the correct frequency the interrogation pulses of the radar of interest are sampled red curve All pulses crossing an adjustable trigger video level green line will be detected and the amplitude and timing information is stored in a file on disk for later analysis Max pulse width 1 us window Max 3 samples Trigger levwel H E men wideo signal threshold detect output T Figure 6 Pulse sampling mechanism theory The sampling rate for the pulses defaults to 16 MHz but will depend on the selection of the maximum pulse width parameter In the pulse detection mechanism a maximum pulse width can be defined to be able to detect reflected pulses It needs to be set according to the expected pulse width of the interrogation pulses The value for this pulse width window must be set about 30 longer than the expected pulse width Ther
81. wnlink antenna modulation 7 STC OMEGA Downlink antenna modulation 8 Quantized VideotDSTC modulation Figure 1 Block diagram DT1529 IE UM 00171 002 DTI529 RASS S Tutorial odt 12 71 Didactical Test Interrogator DTI529 Edition Date 03 Jan 13 1 4 Interface and External Connectors 1 4 1 Power Supply The DT1I529 is powered through a DB9Y connector It can be powered from the back panel DBY connector of the RFA641 the RF T646 or through an external power supply 1 4 2 Operation Mode Selectors e Mode A C S Switches from A C mode interlace to a A short P4 C short P4 and UF11 all call mode interlace e SLS ON OFF Disables the control beam of the antenna and doing so switches off the P2 or P5 pulses This switch becomes handy when the interrogations are intended to evoke a reply or to simulate a malfunctioning antenna e Motor Alters the antenna rotation speed from 4 2s to 8 4s s Encoder Selects the precision of the encoder to 12 or 14 bit resolution the 12 bit encoder mimics an eccentricity error the 14 bit encoder is flat s Tx On Off switches the transmitter on or off e Primary Secondary selects the antenna pattern that is transmitted PSR or SSR antenna pattern 1 4 3 Signal Input Outputs of Antenna Tx Section e Antenna Outputs the interrogations of the transmitter and inputs the replies of the targets The request and reply signals will be picked up on a specific point i

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