User Manual - Electronics & Electrical Communication Engineering
Contents
1. 12 3 3 1 Installing DGPS Viewer 12 Chapter 4 Operation isiriciionszs Da 14 4 1 Operation Under Manual 14 4 1 1 Contacting Beacon Stations nima 14 4 1 2 Applying Built in Beacon Station List eese 22 4 1 3 Making Use of DGPS GPS Signals eee 2 4 2 Operation Under Auto Mode ne 29 4 3 Auto Search Operations ceci ett lai 20 4 4 Operation Without DGPS Features 30 Chapter 5 Ai eee lle 31 5 1 Standard Accessories pisciare 31 3 2 Optional Accessories P 32 Chapter 6 Technical oman iq eee ibas uta a 33 6 1 SPAN uen 33 6 1 1 GPS RECEIVER GENERAL aad Ra 33 6 12 BEACON RECEIVER 33 61 3 COMBINED RECEIVER GENERAL aad 34 SAN JO SE VIG ATIO N C Professional in N g on amp Communication 6 2 NMEA 0153 Protocolli a aa 34 6 2 1 About NMEA 0183 Protocol 34 6 22 Band Rate amp Character 36 6 3 NMEA 0183 Output Sentences 37 cet Noi TES 37 GPZDA OUO cried 39 043 SOPOLE ddl ea aaa babas 40 6 34 41 6 3 3 42 64 0 SU 43 6 3 12. Example GPGLL 3444 1234 N 03521 0000 E 123456 A CR LF Fields 1 3 3 6 Description Range Bytes 1 Latitude 34 degree 00 90 0 20 44 minute integer 00 59 0 20 1234 minute fraction 0000 9999 4L N North South Nors 010 3 Longitude 035 degree 000 180 0 30 21 minute integer 00 59 0 20 0000 minute fraction 0000 9999 L 411 E East West EorW 0 1 5 UTC 12 hh 00 23 0 20 34 mm 00 59 020 56 ss 00 59 0 20 6 Status AorV 0 10 Interpreting Ezample 34 degree 44 1234 min N 35 degree 21 0000 min E UTC 12 34 56 Status Positioning A Stand alone or DGPS positioning V Positioning interrupted SAN JO SE WAV IG ATIO N 1IN I Professional in Navigation amp Com munication 6 3 4 GPGSA out Positioning Status Example GPGSA A 3 01 02 403 Lessons 02 00 03 00 04 00 CR LF Field 1 2 3 4 3 6 15 16 17 Description Range Bytes 1 Operation Mode MorA 010 M 2D only Mode A 2D 3D Auto switching Mode 2 Positioning Status 1 3 1 Positioning interrupted 0 10 2 2D positioning 3 3D positioning 3 14 Satellite Numbers Used 01 32 Note A null field is output 0 20 for Positioning unless a satellite is available 15 PDOP n a Note 00 00 is output unless 50 3D positioning is performed 16 HDOP n a Note 00 00 is output while 5 positioning is in
3. 611 GPSRECEIVER GENERAL SIGNAL PROCESSING Antenna High reliability ceramic patch Antenna LNA gain 26 2dBi NF 2 0dB max Receiver Frequency 1575 42MHz C A code L1 band Receiver Architecture 12 channel ail in view algorithm tracks amp uses up to 12 satellites Update Rate second continuous Dynamics Up to 49m s s tracking sustained Datum WGS 84 plus 170 user selectable datum GPS Positioning Accuracy 15m 2DRMS L1 C A code HDOP 4 without SA GPS Positioning Speed 0 1 Kt RMS DGPS Positioning Accuracy 1 5m 2DRMS L1 C A code HDOP 4 DGPS Positioning Speed 0 1 Kt RMS Cold Start 90 seconds Warm Start 20 seconds Reacquisition 2 seconds 6 12 BEACON RECEIVER GENERAL SIGNAL PROCESSING Frequency Range 283 5 325 0 kHz Channel Spacing 500 Hz Frequency Resolution 0 01 Hz Minimum Signal Strength lt 5 uV m Q 100bps Dynamic Range gt 90 dB Adjacent Channel Rejection 60 dB 61 KHz Acquisition Time lt 2 sec manual command lt 2 sec automatic warm start lt 1 min automatic cold start Selection of Station Automatic or manual Signal Detection Direct digital synthesis DDS DATA PROCESSING 34 4 SAN JO SE N AV IG AT IO N IN C P ro fe ssional in Navigation amp Com m unication Demodulation MSK Minimum Shift Keying Error Detection Parity error check MSK Bit Rates 50 100 200 automatic 613 COMBINED RECEIVER GENERAL DATA PORTS Monitor Control Port RS 23
4. Pro fe ss 10 n l der Navigation amp Com m unication om DGPS Receiver DGPS 220 PC USCG IALA Beacon compatible User Manual Version A Please read this manual before operating the unit Rev Dec 23 2002 San Jose Navigation Inc SANJOSE NAVIGATION INC 9F NO 105 SHI CHENG ROAD PAN CHIAO CITY TAIPEI HSIEN TAIWAN R O C TEL 886 2 26879500 L l FAX 886 2 26878893 A E VVVVVV SANAV COM d 2 ISO 9001 NO T2000 351 SAN JO SE N AVIG A TIO NZI Pro f e ss ton adl in N g o amp Com m unication Content rime dici i ML d q 4 1 1 WS 4 1 2 What 18 DGPS7 5 1 3 Why use DGPS aa 6 1 4 How 1S DGPS s d aaa 7 Chapter 2 Introduction of 5 220 L R y RAR iaia 8 2 1 What Makes DGPS 220 PC Different eee 8 2 2 Main Features c Applications renato 9 2 2 1 The main features of DGPS 220 PC UL ene trie etienne 9 22 din D 9 Chapter 3 cuiu T b 10 3 1 Mounting the 10 3 1 1 Choosing a LuCalOm da aneii 10 3 1 2 Mount the 10 3 1 3 Connector Configuration eie eoi nin pena asa 10 3 2 Routing the Power Data 11 Bol Choosing a Cable Route lella 11 227 Securing the Cable aida 11 3 3 Software
5. 44 6 4 Luma 46 Chapter 7 Beacon Station 51 Chapter 8 DU A 52 8 1 Common 53 Chapter 9 IMPORTANT NOTES pali 55 Chapter 10 WARRANTY R D 56 AN QO SE N A VIG AT IO NI SS Professional 1 ati amp N C in ga o amp Com m unication Chapter 1 Overview Congratulations on the purchase of DGPS 220 PC a new member of our successful DGPS 220 receiver family You will find the device an accurate reliable and useful aid to your positioning pursuits Before introducing you our new receiver we would like to give you some basic background knowledge about GPS and DGPS which should be helpful for you to better understand your DGPS 220 PC 11 Whatis GPS GPS Global Positioning System is a satellite based global navigation system created and operated by the United States Department of Defense DOD Originally intended solely to enhance military defense capabilities GPS capabilities have expanded to provide highly accurate position and timing information for many civilian applications An in depth study of GPS is required to fully understand how it works but simply stated Twenty four satellites in six orbital paths circle the earth twice each day at an inclination angle of approximately 55 degrees to the equator This constellation of satellites continuously transmit coded positional and timing information at high frequencies in the 1500 Megahertz ra
6. 005 6 speed kts 000 0 999 9 variable Note A null field is output unless speed information is available 8 True Course 123 5 degree 000 0 359 9 variable Note A null field is output unless true course information is available 9 UTC Date 45 SAN JO SE N AV IG A TIO N IN C Professional in Navigation amp Communication 02 DD 01 31 20 01 MM 01 12 020 95 YY 94 40 1994 2040 20 10 Magnetic Deviation degree 001 0 degree 000 0 180 0 50 W West VV or E 10 VV West MAG TRUE DEV E East MAG TRUE DEV Checksum 8 bits data between and excluding amp are XORed and the result is converted to 2 bytes of hexadecimal letters Only RMC sentences are transmitted with checksum All other output sentences do not include checksum fields Interpreting Example UTC 12 34 56 34 deg 44 1234 min N 135 deg 21 4567 min E Status Positioning Speed 5 6 kts True Course 123 5 degrees UTC date Jan 2 1995 Magnetic Deviation 1 0 degree West 46 SAN JO SE N A V IG A TIO N IN C Professionals in Navigation Com m unication 64 Geodetic Datum There are many geodetic systems in the world Enter a right geodetic system datum in accordance with your chart or map in use If the geodetic system in which you are situated differs from the geodetic system employed in your chart or map GPS fixes may be deviated from the actual positio
7. Start of Sentence marker 5 byte fixed length First 2 bytes represent a talker ID and the rest 3 bytes do a sentence formatter All sentences transmitted by DGPS 220 bear talker ID GP meaning a GPS receiver For the sentences received from an external equipment the DGPS 220 accepts any talker ID Talker ID XX found on the succeeding pages is a wildcard meaning any valid talker ID data field on Variable or fixed length fields preceded by delimiter comma Commas are required even when valid field data are not available i e null fields EX In a numeric field with fixed field length fill unused leading digits with zeroes Do not suppers leading zeroes Generally not required with the exception of RMC sentence 8 bits data between and excluding and are XORed and the resultant value is converted to 2 bytes of hexadecimal letters Note that two hexadecimal letters must be preceded by and delimiter is not required before lt checksum gt Only RMC sentences are transmitted with checksum All other output sentences do not include lt checksum gt For input sentences checksum is ignored lt CR gt lt LF gt End of Sentence marker Maximum length from to lt CR gt lt LF gt is limited to 82 bytes including and lt CR gt lt LF gt 6 Examples of Approved Sentences GPGLL 3444 000 N 13521 00 E E lt CR gt lt LF gt XXGLL 3444 0
8. the UTC output directly after power on may not be accurate Japanese local time is obtainable by adding 9 hours to UTC The UTC which you enter is used for the first time search of a satellite directly after power on If UTC you enter is deviated much from the actual UTC first fix will delay accordingly UTC entry with 10 minutes accuracy is desirable When DG PS 220 internal UTC is incorrect due to discharge of the backup battery etc enter UTC as correctly as possible D G PS 220 internal UTC is automatically adjusted to a correct value once a satellite is tracked 1 Common Terms PC Personal Computer Comm Communications LED Light Emitting Diode GPS Global Positioning System MOB Man Over Board ye ponmc og o SAN JO SE NA V gt ro f ssi E ig a ior al in Naviga INT Interval GGA Global Positioning System Fixed D ata GLL Geographic Positioning latitude longitude GSA GNSS DOP and active satellites G SV GNSS Satellites in View RMC Recommended Minimum Specific GNSS D ata VTG Course Over Ground and Ground Speed DC Direct Current TTL Transistor Transistor Logic TTFF Time To First Fix IG AT I O_N 1c ation Chapter9 IMPORTANT NOTES Itis recommended that you familiarize yourself with our operation by connecting the unit to the PC cable and mains power pack This will enable you to practice the operation of the unit Read the manual carefully and its operation will become clear and simpl
9. to enlarge the NAVIGATION window press the NAV button as shown below DATE TT LOD TEACH bli ET FLEW SAE TES Pu LEE LALO Fii n nu DOE BIO es 4 BEHew Heri ques ity VT REF HIE HE in eel pia fin TED je k H s Avia THOU HR F d d aran Pini Diani To minimize the window press the Tile button at the menu bar in the top of the main screen N C 18 S A N JO SE NAVIGATION lc TES Di bled 52s HEY GATE Pi CIE Ahi ua BAH AHH HAWHEHATION ii uam I SEPA PORT AT OB ETY Tau vie REF EM DO EAS JOUE ASSIA IHT mms r paman riam p eee 6 1 eo at FT baz puce n ues Ame man 19 SAN JO SE N AVIG AT IO N INC Com m unication 7 eee Pai I amm Hamm ja er cm 1 ni min TE 8 Press the Mode button at the bottom of the main screen to select the Manual mode which appears as Manu in the field Then enter the appropriate frequency and the baud rate in the Freq and B R fields respectively diim pk H r k Tuz indi WIND a pozun D TI Press the Mode Button Manu Manual Mode Enter the appropriate Enter the appropriate Baud Rate here Frequency here 20 x SAN JO SE _ NAVIGATION Professional a v a i amp Communication 9 Press the OK button to complete the beacon station configuration DAH sir BRETON HA
10. 220 PC 1 on certain open space with a relatively unobstructed view of the horizon in all directions 2 outside the path of radar transmitting antennas and away from other sources of interference such as DC motors transceivers solenoids and other electronic devices and 3 at certain height to avoid the obstruction of other higher objects nearby Mount the DGPS 220 PC The DGPS 220 PC is designed for a pole mount of a standard 1 14 marine thread 1 Place the DGPS 220 PC on the 1 14 threaded mast 2 Tighten the DGPS 220 PC firmly on the pole mount by hand Note Over tightening with a tool will cause damage to the threaded socket at the base of the DGPS 220 PC and such damage goes beyond SANAV warranty 3 To maximize signal reception mount the DGPS 220 PC parallel to the horizon Connector Configuration DGPS 220 PC comes with a cable with one 7 pin connector at one side that attaches the receiver itself and an open end the other side that can be configured as any kinds of connectors you want In our example we have made that open end two DB 9 connectors attaching one of the com ports of your computing device One DB 9 connector is to receive signals from beacon stations hereinafter refers to the Beacon Station connector and the other to receive RTCM formatted signals from GPS based satellites hereinafter refers to the GPS connector A wiring label illustrating the function of each pin is attached on both the bott
11. BO are used 7 m SAN JO SE NAV IG A TIO N 1IN ve Professional in Navigation amp Com m unication 63 0183 Output Sentences 6 3 1 GPGGA out Position Altitude UTC etc Example GPGGA 123456 3444 0000 N 13521 0000 E Field 1 2 4 304 302 00 000123 0 M 0036 0 Field 6 7 8 9 10 11 M 13 001 CRLF Field 12 13 14 Description Range Bytes 1 UTC 12 hh 00 23 0 20 34 mm 00 59 1 20 56 ss 00 59 0 20 2 Latitude 34 degree 0 90 O 20 44 minute integer 0 59 0 20 0000 minute fraction 0000 0999 40 N North South Nors 0 10 4 Longitude 135 degree 000 180 0 30 21 minute integer 00 59 20 0000 minute fraction 0000 9999 L 411 H East VVest E or W O 10 6 Status 0 2 0 Positioning not started yet 10 1 Stand alone GPS positioning 2 Differential GPS positioning 7 No of satellites used 00 08 0 20 8 DOP n a Note 00 00 is output while 50 20 3D PDOP v positioning is interrupted 9 Altitude 00999 9 to 017999 9 80 10 Unit for altitude M 0 1 11 Geoide Altitude 999 9 to 9999 9 O 6L 12 Unit for geoide altitude M U 10 13 DGPS Data Time 00 99 variable S JO SE NAVIGATIO N INC Pro fessiornal i avig x Com m unication This value indicates the time elapsed since the last RTC
12. JHONSTON ISLAND 1961 KANDAWALA KERGUELEN ISLAND KERTAU 1948 LA REUNION L C 5 ASTRO LIBERIA 1964 MAHE 1971 MARCO ASTRO MASSAWA MERCHICH MIDWAY ASTRO 1961 NAHRWAN NAMIBIA MAPARIMA BWI NORTH AMERICAN 1927 NORTH AMERICAN 1927 NORTH AMERICAN 1927 JO S E Pro fe s sio na 1 N AVIG AT N Navigation amp Com m unication J honston Island hilippines Excluding Mindanao Island indanao Island Eritrea Ethiopia Morocco Masirah Island Oman United Arab Emirates Bahamas Excluding San Salvador Island Bahamas San Salvador Island anada Including Newfoundland Island Alberta and British Columbia Fast Canada Manitoba and Ontario Northwest Territories and Saskatchewan Canal Zone Caribbean Central America Greenland N G 49 SAN JO SE NAVIGATION Com m unication NORTH AMERICAN 1983 OBSERVATORIO 1966 OLD EGYPTIAN 1930 OLD HAWAIIAN Ordnance Survey of Great Britain 1936 PICO DE LAS NIVIES PITACAIRN ASTRO 1967 Provisional South Chilean 1963 Provisional South American 1956 Venezuela PUERTO RICO Puerto Rico and Virgin Islands OATAR NATIONAL QORNOQ South Greenland ROME 1940 Sardinia Islands SANTA BRAZ Sao Maguel Santa Maria Islands Azoes SANTO DOS Espirito Santo Island SAPPER HILL 1943 East Falkland Island SOUTH AMERICAN 1969 Mean Value N G SAN JO SE N AV IG AT IO N INC i g amp Communication Paragu
13. 00 N 13521 00 E E lt CR gt lt LF gt XX may be any valid talker ID such as LC Loran C gt Proprietary Sentences The NMEA 0183 standard allows nav aid makers to send proprietary sentences if the minimum rules defined by the NMEA are obeyed Proprietary sentences must take the following form but it is free to makers what kind of fields are included and 7 in N avi amp gation Pro fe s 8 1 0 mad in Communication in what order they are transmitted out P lt maker ID data field gt lt CR gt lt LF gt where Description Start of Sentence marker Proprietary sentence identifier Sa 3 byte fixed length DGPS 220 maker ID is FEC meaning Furuno Electric Company lt data field on Variable or fixed length fields preceded by delimiter comma Layout is maker definable End of Sentence marker 6 2 2 Baud Rate amp Character Format System Asynchronous Full Duplex Speed 4800 BPS gt Start Bit 1 bit gt Data Length 8 bits MSB 0 gt Stop Bit 1 bit gt Parity Bit None Start Bit BO Bl B2 B3 B4 B5 B6 B7 Stop Bit Flow Control None gt Signal Lines used TD amp RD only Data Output Interval 0 to 2 seconds gt Character Codes used NMEA 0183 Sentences ASCII HEX OD OA 24 2A 2C 2E and alphanumeric Differential GPS Data Binary 6 of 8 format B7 0 B6 1 Only B5 to
14. 2 at 4800 baud Control Format NMEA 0183 Housing 7 pin circular hermetically sealed Pins Gold plated for anti corrosion POWER REQUIREMENTS Input Voltage 12 24V DC with power reverse protection Power Consumption Less than 3W 012 V DC max ENVIRONMENTAL Operating Temperature 30 to 75 C Storage Temperature 40 to 85 C Relative Humidity 95 non condensing PHYSICAL Dimension 3 25 inches height x 4 4 inches diameter Weight 1 5 lbs Enclosure High impact corrosion proof PC polycarbonate resin Construction Hermetically sealed fully weatherproof Mounting Pole mount to 1 14 threaded pipe OEM OPTIONS Sentence Available GGA GLL GSA GSV VTG RMC ZDA Output Interval 0 60 sec selectable Operating Mode 2D or 2D 3D automatic Satellite Masks SNR Elevation PDOP Type of Interface RS 232 standard RS 422 optional Datum WGS 84 plus 170 user selectable datum Extend Input Voltage Up to 60 VDC 6 2 0183 Protocol 6 2 1 About NMEA 0183 Protocol Approved Sentences Approved sentences are those of which formats are defined and fixed within the NMEA 0183 standard Any portion within an approved sentence format is NOT Professional in Navigation amp Com m unication 35 SAN JOSE NAV IG T IO NW IN C user definable An approved sentence generally takes the following form address field gt lt data field gt checksum field gt lt CR gt lt LF gt Where Description
15. A Dolls H WafD i e Stato ID 631 Za ID 32 PEC 1000 ERC 85099950000 AF S4 11 31 PRC 85H99335 00 ERE nnm 120 Sul ID 3 FRC 1374205304 000 REC Dili Bs Sab ID 28 PRC B85H99338 000 ERC 5589937 1100 120 Set IR TT PRC 3591344 DOUD ERE 8509935 ORI 115 Zat ID 3 PRC 85089712 00 ERC 8599935 0000 120 Sul ID 11 PRC 85690344 DOUD ERC Dno 120 Zar ID 8 FHC 850993950000 ERC Oi 120 joe ID 05 PRO 2594600 REC OO 25 Zat 10 03 PRO 85090118 DOO ERE DO 138 Far HR hib me om Freg 313 liliih Hami DN RESI M BLTH T5 MODE MANI Freq 212 h l Hami DIO EZ21 81 HLIH 0 75 MODE MANU TRACOM Freq 31300000 Hami 200 2551 81 HLIN 0 75 MODE MANT Freq BE psi pow Da N C 22 IS AN JO SE NAVIGATIO NI ro fess tonal in avigation amp Com m unication N C 412 Applying Built in Beacon Station List DGPS Viewer PC220 provides you with a list of beacon stations currently available all over the world To use this feature press the STN button of the BEACON window and click OK when you finish E armas san vm um um LLL Ta PEs SHREK HORS eS ar ee ee nali nm x jen dia a jH ed nd n AS ARTI i AE PR SESTA ILA G TO i A h Se L O nik dm PSU de ee ui 0 Press the STN button here Select an appropriate LENA DU AO RT LI STI li ILI country here by double click
16. C TEL ee rx Station ID XXX with a prerequisite of correct entry of both Frequency and Baud Rate the ID of a corresponding beacon station will display in the BEACON window Sat ID XX indicates the ID of satellites currently in use Referring to the Fig 3 RTCM signals from a reference beacon station displays in the BEACON window after the OK button is pressed with a prerequisite of correct entry Note If your entry is out of range an error message box will appear immediately DATE gin uTc T prem F r Pd m n h sd WEE in 114 1 ba g 112 PEC EHO LEC RI DOGR 1TH Lane PEC Oe EEC es DEDR 171 Lia PRC er init B m aaa pa Eu r Fit PIRA UD BRL idm DEP 1XI rin AC C PH EE An error m message IS TT en 8 Eba a Dieta T imib HPPH xu T TE Teki File ROI pm nm on x Cale As long as your entry of Frequency and Baud Rate can reach the beacon station currently available within your range the information on Station ID Sat ID PRC and RRC will flash every five minutes These data will be gone however if your original entry is no longer able to contact that beacon station for two minutes 21 S A N JOSE N AV 1G AT 10H 1 Professional i avigation amp Com m unication To learn about the current status of the beacon station configuration press the INFO button ha JO T Hfo QFb dunglgn A H Esl alls ph I MVL R
17. FICALLY DISCLAIMED The express warranty will not apply to defects or damage due to accidents neglect misuse alternations operator error or failure to properly maintain clean or repair products LIMIT OF LIABILITY In no event will San Jose Navigation Inc or any seller will be responsible or liable for any injury loss or damage direct or consequential arising out of the use or the inability to use the product Before using users shall determine in the suitability of the product for their intended use and users assume all risk and liability whatsoever in connection therewith PURCHASER S DUTIES The purchaser must return the unit postpaid with proof of the date of original purchase with the return address to SANJOSE NAVIGATION INC 9F No 105 Shi Cheng Road Pan Chiao City Taipei H sein Taiwan R O C TEL 886 2 2687 9500 FAX 886 2 2687 8893
18. INC Professional in Navigation amp Com m unication obtained by 3D positioning that altitude is assumed instead of 0 meter 2D positioning is performed when the following two conditions are met At least one satellite is available for acquisition and tracking HDOP which is determined by satellite allocations in the sphere is smaller than 10 HDOP 10 The unit does its best to perform 3D positioning but switches to 2D positioning only when either condition can t be met PDOP Threshold When PDOP degrades exceeding this parameter the unit switches from 3D to 2D positioning automatically Bear in mind that the altitude is updated by 3D positioning only gt HDOP VDOP m G PS positioning position fixing accuracy depends on satellite allocating positions in the sphere Parameters PD HD OP and VD OP indicate this type of degrading indexes for G PS position fixing the smaller the values are the higher the position fixing accuracy gets HD O P means horizontal dilution of position fixing and affects 2D positioning VD OP does vertical dilution PD OP contains these two components as expressed below and can be used for 3D positioning PDOP SORT HDOP x HDOP VDOP x VDOP gt UTC Time This is Coordinated Universal Time D epending on earth s rotating speed leap second of one second or so may be inserted per year The UTC output by the unit is based on both almanac data and satellite tracking Therefore
19. M SC104 TYPEI or 9 data updating Unless DGPS mode is selected a null field is output 14 DGPS Station ID 0000 1023 40 Unless DGPS mode is selected a null field is output Interpreting Example UTC 12 34 56 34 deg 44 0000 min N 135 deg 21 0000 min E Status Stand alone GPS No of satellites 4 satellites DOP 2 00 Altitude 123 0 meters high Geoide Altitude 36 0 meters high DGPS Data Time 13 DGPS Station ID 1 gt BU S AN JOSE NAVIGATION INC Professional in ga io amp Com m unication 6 3 3 GPZDA out Date Time Example GPZDA 123456 01 02 1995 09 00 CR LF Field 1 2 3 4 2 6 Description Range Bytes 1 UTC Time 12 hh 00 23 20 34 mm 00 59 0 20 56 ss 00 59 0 20 2 UTC Day of Month 01 DD 01 31 0 20 3 UTC Month 02 MM 01 12 020 4 UTC Year 1995 YYYY 1994 2040 0 40 1 Local Zone Time Hour 09 hh 13 00 13 30 East West of date line 6 Local Zone Time Minute 00 mm 00 59 0 20 NOTE Local zone time setting is used for calculating local time when outputting PFEC GPast Local Time UTC Local Zone Time Interpreting Example February 1 1995 12 34 56 Local Zone Time 09 00 REA P ro fe ssi nal in 6 3 3 GPGLL out JO SE N AV IG ATIO N IN Com m unication C Position UTC etc
20. NMEA data click PAUSE 5 The SURVEY window contains data as follows To gain a better view of a separate window press the corresponding button SAM dur MEAVIGATIOM IHO a S CARIOR D INE am Vu knee cum Due mira emn on Mida ii ea Lie Lange d CE bezdi E LI Lait er Bai Sd Darei uon rosters Laid Lown r BaP mul Note 1 min 1 8 km gt 0 001 min 1 8 m 27 SAN JOSE NAVIGATION INC Professional 1 avigation amp Com m unication 6 With availability of DGPS positioning you can launch various SURVEY functions by clicking START in the window Then a message box will appear asking you where you want to save a log file for the survey as shown below DATE DD LITE TIME JHA 55 Winey Average Laliberte Longitude SPS Haight Samples LaL an Elewanon Std Deion imeters L atrtaca Langue DOPIP HA Guahby DATE Dow rY UTC TIME HH fM 55 Maan Soraga mhh rina aj EE ESCO aye Click OK when you finish SAN JO SE N AVIG AT IO sz a a v amp Com munication SAR POSC HAWIGATIONH HE TEL B T Z ES PASC 2 TERT A ina iie su TT dab a nal Hour O6 an iceri Ayers Laid ichs SA gr TEN Longue z yn 1 GPS Hari 41 s n amples Lerik on E Cit E va pii on irain Latius bon Lorne m b Euler Dog Hey Gad uI PG E 1 Over time more data are col
21. ada d LOI mm UH ve em paga pem rik 2 ran Late oceano rid IT TE Hhh EI rg di MI Bu idal tT d rrbam iri b E IPD isigi 111 Latine mn TT Ba Desi yaran dra RO HEKE oraq ace 31 SAN JOSE NAVIGATIO IN C Piro f e ss ton al im avig o amp om m unici Chapter 5 Accessories 5 1 Standard Accessories 1 RS 232 Cable 15m attached vvith a VViring Label surrounded by a red rectangle shown in the picture above 2 Wiring Label PAVE COLOR PUWCTION arscn uu Attached to the RS 232 Cable f fi Facete Til r reca n cz mm amd ron PC or a tn pup GPS mehr Bano recens p parasi 3 nen Weare T sspalbecu qa PE data EE ond 5 Yel mani fae pound cranes hara B irsranxi and to the bottom of 4 Hua Tan Te b rama b en vb c it kir EMI apa Ld Care a n 8 r Hara pe of Be cer DGPS 220 PC surrounded by E meh Pii EPICA Iu Pre rolu m x unun o ared rectangle bar as shown in the left picture 3 Utility Programs DGPS Viewer PC220 Version 2 0 4 User Manual Version A 32 SAN JO SE E J Professional in N AV N avig IG A TIO N om munic N G 5 2 Optional Accessories 1 Magnetic Mount Permanent Mount 33 4 SAN JOSE NAVIGATIO N IN C m Professionoai in Navigation amp Com m unication Chapter 6 Technical Information 6 1 Specifications
22. ay Trinidad and Tobago Venezuela SOUTH ASIA Singapore SOUTHEAST BASE Porto Santo and Madeira Islands SOUTHWEST BASE Faial Graciosa Pico Sao Jorge and Terceira Island TIMBALAI 1948 runei and East Malaysia Sarawak amp Sadah TRISTAN ASTRO 1968 VITI LEVU 1916 WAKE ENISETOK 1960 ZANDERIJ BUKIT RIMPAH CAMP AREA ASTRO G SEGARA HEART NORTH HU TZU SHAN Tananarive Observatory 1925 Sweden SAN JOSE VIG ATIO 4 Pro fessionalsdi n ga io amp Com munication Chapter 7 Beacon Station List For the most updated information on the Beacon Station List please visit http www csi wireless com support pdfs radiolistings pdf In addition our utility program also provides you with information on beacon stations N G 52 S AN JO SE VIG AT IO Pro fessiornal iy N g o amp Com m unication N C Chapter 8 Glossary Almanac GPS Data Almanac is constellation data for all GPS satellites Each G PS satellite transmits almanac The unit receives G PS satellites referring to almanac Unlike ephemeris almanac indicates rough constellation only and is not directly used for position time fixing Unless almanac is available the unit must try to acquire satellites sequentially until it successfully acquires one Almanac Data Output Data Almanac is a very stable data like your calendar So once the unit receives almanac it is preserved f
23. ding button AF JOSE HANTOATIIB INC p Here apum i bia ieri x SS ama n kaman mar ATEALTTEEZ Fi UE SPIGA 1231250557 Fu an ALTITUDE bi an nn m CoG 2448 SOG BD DGPS positioning is resulted rm m Hoe l VHP Ban bala m E SAGE from the availability of a Other data in the NAVIGATION window are described below Data Descriptions Date DD MM YYYY The date of positioning UTC TIME HH MM SS Coordinated Universal Time Temps Universal Cordon The international time standard formerly Greenwich Mean Time or GMT Zero hours UTC is midnight in Greenwich England which is located at 0 degrees longitude Everything east of Greenwich up to 180 degrees is later in time everything west is earlier SAT Satellite ID ELEV Elevation AZM Azimuth SAN 4 JO SE NAV GAT ON P ro fe ss 1 0 na 1 in ga io amp Com m unication SNR The signal to noise ratio The ratio of the amplitude power volume of a data signal to the amount of noise interference in the line Usually measured in decibels it measures the clarity or quality of a transmission channel audio signal or electronic device The intent is always to make the ratio greater so that the unwanted noise can be more easily identified and thus eliminated SATELLITES IN USE The number of satellites currently in use SERIAL PORT The Com Port current
24. ding 1 5 meter DGPS positioning accuracy by utilizing the broadcasted 283 5 325KHz differential GPS corrections from the USCG CCG or IALA Beacons at no charge Both GPS and Beacon receivers antennas are built inside the enclosure making DGPS 220 PC a single device featuring easy installation maintenance and integrated services SAN JOSE NAVIGATIO N INC Professional in Navigation amp Com m unication 22 Main Features amp Applications 4 2 2 1 The main features of DGPS 220 PC High positioning accuracy 1 5m User configurable output sentences User programmable output time interval User selectable datum WGS 84 plus 170 user selectable datum Standard RTCM SC 104 Standard RS 232 amp optional RS 422 signal levels Wide operating voltage range 12 24V DC Compact construction fully weatherproof Excellent noise immunity VV VV VV VV WV Easy installation amp operation 2 22 Applications gt Marine terrestrial or aeronautical applications Real time and post processing DGPS yield monitors Soil sampling location Crop and land mapping applications Public Safety precise vehicle location Construction VV VV V WV Transportation 10 SAN JOSE NAVIGA T IO 3 1 3 11 3 12 3 13 N C Professional in Navigation amp Com m unication Chapter3 Installation Mounting the DGPS 220 PC Choosing a Location To minimize potential reception problems you are advised to mount the DGPS
25. e We use an internal battery to retain the memory of stored data After a certain period this battery will need to be replaced T his is not covered under warranty Please do not disassemble our D GPS receiver T his will destroy the unit s security seal and the logger may no longer function If you disassemble the unit it will have to be returned to us for reassembly T his will also void the warranty It is always safer that you seek assistance with our technical engineers if you are inexperienced with electronic work 56 j SAN JOSE NAVIGATION Professional in Navigation amp Com m unication N C Chapter 10 WARRANTY LIMITED WARRANTY SANJOSE NAVIGATION INC expressly warrants that for a period of one 1 year from the date of purchase Our accessories will be free of defects in material parts and workmanship labor Within the warranty period a unit will be tested repaired or replaced at our option at no charge If your unit is out warranty we will quote repair charges necessary to bring your unit up to factory standards THIS WARRANTY APPLIES ONLY TO ORIGINAL PURCHASE Any unit under warranty should be shipped prepaid to our factory Warranty replacements will take approximately ninety 90 days WARRANTY EXCLUSION THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES EXPRESSED AND IMPLIED INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECI
26. elow h ute m 0273 D X x1 s ESET AT Tr G 13 IS AN JO SE N AVIG A TIO NI Communication 2 Please enter the directon in which bo ratai navigation Trem Labiw ndowes A41 Fur T ini Ergin b ahsady retaled Di nasagalion Change Labain EV Aure Time Engine Directoy DW EMV yriam17 ORTE Cheng 3 The default folder for the program is in your system drive If you want to change it press the Change button otherwise press the Finish button to complete the installation N C 14 SAN JOSE NAVIGA T10 H 1 Piro fe sio na l im aviga io amp om m unici Chapter 4 Operation Instruction DGPS 220 PC can be operated under the manual or the automatic mode which are detailed as follows 4 1 Operation Under Manual Mode This mode is particularly designed for those who are certain about the frequency and the baud rate for a reference beacon station In general operating efficiency under this mode is significantly higher than the Auto Mode and thus you are strongly recommended to choose this mode whenever it is possible 411 Contacting Beacon Stations Procedures 1 Click Start gt Programs gt navigation Then launch the program by navigation double clicking the icon 2 The main screen of the program will then appear as below Referring to the Fig 1 there are four separate windows namely NMEA N G Si nnm JOSE NAVIGATION INC Profes
27. etween the measured and calculated range is the total error The error data for each tracked satellite is formatted into a correction message and transmitted to GPS users The correction message format follows the standard established by the Radio Technical Commission for Maritime Services Special Committee 104 RTCM SC104 These differential DUN SAN JOSE NAVIGATIO I C Professionals imn Navigation amp Com m unication corrections are then applied to the GPS calculations thus removing most of the satellite signal error and improving accuracy The level of accuracy obtained is a function of the GPS receiver GPS Satellites A N a F x E Reference Station Coupler DGPS Radiobeacon Antenna Differential GPS Broadcast Site 13 Why use DGPS DGPS accuracy and integrity are better than GPS gt Accuracy improvement 2drms Positions of 10 meters or better are achievable using DGPS USCG signals vs 100 meters or better for GPS Standard Positioning Service Integrity improvement Provides an independent check of each GPS satellite s signal and reports whether it s good or bad SAN JO SE _ NAVIGATION 4 1 im N avigation amp Com m unication 14 How is DGPS used DGPS receivers collect navigational signals from all GPS satellites in view plus differential corrections from a nearby DGPS site Many DGPS rece
28. ing it 23 SAN JO SE Select an appropriate city here by double clicking it Click OK when you finish N AVIG AT IO ation Com m unic 4 1 3 Making Use of DGPS GPS Signals After successfully contacting a reference beacon station you are supposed to be able to receive DGPS signals through our DGPS 220 PC To begin receiving signals switch the Beacon Station connector to the GPS connector Then related data will display in the other three windows namely NMEA NAVIGATION and SURVEY ina anta i rH ETC Et Er ATTI FA DIR ODERD B DITS ADA MENTE TIR HIT a0 S TURCO SITE ATE SLIT EmN ek ED 5 4 TURLE HSLS EIH ILEA A A PODE 1 1 OR TE 2 das AES T 1 Hr haz ih B tl Ezan aT m A MTM LI 2 a HENSE a Era a Sad SAH JOSE HAWIGATICHM INC oo MUNTEN UE Te ET are ESTR e r he Per ATH nt ji iden kaa 4 Ooh His oon Ut Gen GPS data in the NAVIGATION NMEA and SURVEY windows are briefly described in following pages N C 24 4 SAN JO SE NAVIGATION 2 Professional imn Navigation amp Com m unication N C If you have successfully contacted a reference beacon station the Quality field of the NAVIGATION window will show DGPS indicating you are currently under DGPS positioning To gain a better view of a separate window press the correspon
29. ivers consist of two units a GPS receiver with a data port for DGPS corrections directly connected to a radio receiver DGPS receivers display position velocity time etc as needed for their marine terrestrial or aeronautical applications N C SAN JOSE UAYVILI G AT ION IN C 4 Professionalin ga io amp Com m unication Chapter2 Introduction of DGPS 220 PC 21 VVhat Makes DGPS 220 PC Different It is the availability of host based operation that makes DGPS 220 PC different from its predecessor DGPS 220 which features automatic search for beacon stations In addition to the automatic mode DGPS 220 PC now offers a manual mode an extra feature that allows users themselves to set up in their computing devices the frequencies and baud rates for beacon stations This feature is designed mainly to provide users with enhanced flexibility in positioning without scarifying accuracy As part of effort to free manual operating users from the hassle of finding beacon stations available for their locations DGPS 220 PC is shipped with a list of beacon stations located worldwide Essentially DGPS 220 PC is an integrated GPS Beacon receiver with built in antennas providing differential GPS corrections in NMEA 0183 format for navigation requiring high degree of accuracy DGPS 220 PC is a combined high performance GPS receiver and a differential beacon receiver in an extremely compact and fully waterproof enclosure provi
30. lected 2 Results of increased data as the receiver has obtained more information on Samples of Samples DATE DOM UTO TRE irta Nisin scena Lambe A Logica HiME FS to EH Lai n Denton m He Dest mi on Lemur Longinuda 128 Elevator 15 DoPEPHvi DE nib 0357 rul Dora mu E AH JOSE A POH IC SL PAS ee D A amm Oe co Baa ere Ae N C 29 SAN JO SE N AVIG A TIO N IN C Professional in Naviga io amp Com munication 4 2 Operation Under Auto Mode This mode is designed for those users who have no idea about the appropriate Frequency and Baud Rate of the reference beacon station available for their location A default set of Frequency and Baud Rate which are configured in line with export destinations is stored in the RAM of ex factory DGPS 220 PCs Over time after applications eight sets of used Frequency and Baud Rate are stored in the RAM The default set of Frequency and Baud Rate serves as the first of the eight sets in the RAM under Auto Mode operation Over time after applications the set of Frequency and Baud Rate used in the last time serves as the first set in the RAM The receiver adopts the first set of Frequency and Baud Rate for four minutes and three minutes respectively and then switches to the second and so on every one minute until having found a matching set of Fre
31. ly in use LAT LON Latitude and Longitude FIX A position determined by observation and computation which can be 2D or 3D D stands for Dimension here 2D means that the current positioning is being conducted in the two dimensions without measuring the altitude thereby resulting in GPS positioning 3D means that the current positioning is being conducted in the three dimensions thereby resulting in DGPS positioning a more accurate position fix than GPS Altitude The height of a thing above a reference level especially above sea level or above the earth s surface COG Course Over Ground SOG Speed Over Ground HDOP Horizontal Dilution of Precision VDOP Vertical Dilution of Precision DGPS AGE The interval between the DGPS data currently in use and the impending one The shorter the Age the better DGPS performance REF STN ID Reference Station ID The ID of the beacon station that transmits RTCM signals for DGPS operation Data shown in the NMEA window are GPS sentences transmitted via the NMEA 0183 protocol SAN JO SE NAV IGCATI ION INC ation Com m unication To gain a better view of a separate window press the corresponding button Press this button to halt the transmission of NMEA signals Fid a i mai For more information on GPS sentences please see the Section 6 2 of Chapter 6 4 To halt the receipt of
32. n on the chart or map International Geodetic Datum Mean Value Japan Korea amp Okinawa NORTH AMERICAN 1927 Mean Value CONUS EUROPEAN 1950 Mean Value AUSTRALIAN GEODETIC 1984 Australia and Tasmania Island ADIADAN Mean Value Ethiopia Senegal Somalia AIN ELABD 1970 Bahrain Island ANNA 1 ASTRO 1955 Cocos Island ARC 1950 Mean Value Botswana Lesotho Malawi Swaziland Zambia IZimb abwe Mean Value Kenya z Tanzania Tanzania ASCENSION ISLAND 1958 Ascension Island ASTRO BECON E Iwo Jima Island ASTRO B4 SOR ATOLL Tern Island ASTRO POS 714 St Helena Island ASTRONOMIC STATION 1952 Marcus Island SAN Professional in AUSTRALIAN GEODETIC 1966 BELLEVUE IGN BERMUDA 1957 BOGOTA OBSERVATORY CAMPO INCHAUPE CANTON ISLAND 1966 CAPE CANAVERAL CARTHAGE CHATHAM 1971 CHUA ASTRO CORREGO ALEGRE DTAKARTA BARAVIA DOS 1968 EASTER ISLAND 1967 EUROPEAN 1950 Cont d EUROPEAN 1979 GANDAJIKA BASE GEODETIC DATUM 1949 GUAM 1963 GUX 1 ASTRO HJORSEY 1955 HONG KONG 1963 INDIAN IRELAND ISTS 073 ASTRO 1969 JO S E VIGA T Navigation amp 10 Na Communication Australia and Tasmania Island iFfate and Erromango Islands ermuda Islands Phoenix Islands South Africa Mean Value Florida amp Bahama Islands Tunisia Chatham Island New Zealand Paraguay Sumatra Island Indonesia Gizo Island Nevv Georgia Islands Diego Garcia N G SAN
33. nge GPS receivers with antennas located in a position to clearly view the satellites pick up these signals and use the coded information to calculate a position in an earth coordinate system GPS is the navigation system of choice for today and many years to come While GPS 5 SAN JOSE NAVIGATION I Professional in Navigation Communication N C is clearly the most accurate worldwide all weather navigation system yet developed it still can exhibit significant errors GPS receivers determine position by calculating the time it takes for the radio signals transmitted from each satellite to reach earth It s that old Distance Rate x Time equation Radio waves travel at the speed of light Rate Time is determined using an ingenious code matching technique within the GPS receiver With time determined and the fact that the satellite s position is reported in each coded navigation message by using a little trigonometry the receiver can determine its location on earth Position accuracy depends on the receiver s ability to accurately calculate the time it takes for each satellite signal to travel to earth This is where the problem lies There are primarily five sources of errors which can affect the receiver s calculation These errors consist of 1 ionosphere and troposphere delays on the radio signal 2 signal multi path 3 receiver clock biases 4 orbital errors also known as ephemeris errors of the satellite s e
34. om of DGPS 220 PC and the cable as shown below to help you with configuring the two DB 9 connectors uy SAN JOSE NAVIGATIO N 1MN C Professional in Navigation amp C om munication COLOR FUNCTION DESCRIPTION 1 White Fecsiya 182 To receive commands from PC for setting up GPS andior Beacon receiver s parameters 2 Green Transmil 1 To output accurate GPS data in NMEAD183 formal 3 Yellow Ground Signal ground common Io receiva amp ransmit 4 Braid Earth To be connected lo vehicle chasis far EMI suppression If necessary 5 Blue Transmit 2 Toowiputstatus data showing the status of Beacon receiver 8 Black Power Negative I Red Poware Pasitve Power input DC12V 24V_ 3 2 3 2 1 3 2 2 Wiring Label Routing the Power Data Cable The 15 meter Power Data Cable provided with the DGPS 220 PC is terminated on one end with a circular 7 pin connector and on the other end with exposed wires Choosing a Cable Route Right after the mounting of the DGPS 220 PC you should go on routing the povver data cable from the DGPS 220 PC to your computing device VVhile routing the cable choose the most direct path to the display device and consider the following suggestions 1 Keep the cable away from corrosive chemicals sharp or abrasive surfaces and from areas of excessive heat 2 Avoid excessive tension sharp bends or kinks in the cable 3 Locate the cable away from rotating machinery or reciprocating equi
35. or a considerable long term Almanac date output indicates when the unit received the existing almanac RTCM SC 104 Differential GPS Error correcting data based on the standard released by the Radio Technical Commission for Maritime Services Washington D C This unit supports the following three data Type Message Differential GPS Correction Data Basic D ata Type 3 Message Locations of Base Stations Type9 Message High rate D ifferential G PS Correction D ata When these correction data are entered DG PS mode is invoked automatically resulting in high precision position fixing When DGPS mode is invoked the position fixing status changes to D G PS automatically DGPS 220 PC ignores messages other than TY PE 1 3 and 9 3D Position Fixing In 3D position fixing altitude is obtained in addition to L L For 3D fixing the following conditions should be met More than four satellites can be acquired tracked which is determined by relative allocations of satellites in the sphere must be smaller than the preset threshold PDOP lt PDOP Threshold D efault 6 Setting may be altered Number of Satellites for DGPS Satellite correction number involved in DG PS input data DGPS Station ID DGPS station ID number ranging from 0 to 1023 as defined by RTCM SC 104 specifications 2D Positioning Assuming the altitude at 0 meter the unit fixes L L If a reliable altitude had been 53 m SAN JOSENAVIGATION
36. pment 4 Avoid routing the cable through door or window jams Securing the Cable After the cable routing has been completed you should now fasten the 7 pin connector to the DGPS 220 PC and secure the cable with tie wraps along the routing 1 Align the cable connector with the mating connector on the DGPS 220 PC Please note that power has to be turned off if you ve previously connected the cable to a power source Otherwise ill matched connection between the pins and the DGPS 220 PC connector will damage the receiver 2 Fasten the interconnection with the locking nut Seal up the cable connector by pulling the watertight sleeve up to the DGPS 220 PC 4 Use tie wraps to secure the cable along the routing SAN JOSE N AVIGATIO N IN Professional i aviga io amp Com m unication m Gikcon Waka Cove me F 3 Ms HIN ASS ESMMDENT Wiring Layout 3 3 Software Installation Since all of the DGPS 220 PC operations are carried out in your computing device the product is especially shipped with one CD in which an application program called DGPS Viewer PC220 version V1 13 is stored The DGPS Viewer PC220 is formulated to work with the device 3 3 1 Installing DGPS Viewer PC220 Procedures 1 Insertthe appropriate CD into your computing device Double click the setup icon to install the program in your system drive In our example we assume the system drive is the D drive as shown b
37. quency and Baud Rate of a reference beacon station for your location Therefore the entire process of this mode lasts for eleven minutes four minutes for the first trial and one minute for each of the remaining seven trial 43 Auto Search Operation In case there is no matching Frequency and Baud Rate in the eight sets stored in the RAM the receiver would launch an automatic search for any beacon stations available for your location As such this approach generally spends even more time finding an appropriate reference beacon station than the Manual Mode In addition this approach could even end up in void so you are strongly recommended to adopt the Manual Mode first whenever it is possible and use the Auto Mode as an alternative for the Manual Mode SAN JO SE N AV IG ATIO N INC 4 4 Operation Without DGPS Features DGPS 220 PC allows you to receiver GPS signals even if you fail to obtain DGPS features largely due to unavailability of an appropriate reference beacon station for your location In this case DGPS Viewer PC220 displays a REF STN ID shown the last time in our example it is 631 its Quality refers to GPS and the DGPS AGE is not available RE HN BATA UC ee DATE eM rr ThE HH PATFLLITER A Le i r E ian i LaT LoH MEMS 118 155581 Fa ALT we 55 E x EAH BAHL ES DH TLS 4 ETHES BAV HER l HuTERTi Em umur sri eur l arazi rcrum TAB BILE MAWHIATRON PL TELE i MITAD d
38. sional in vig a io amp om m unica io BEACON NAVIGATION and SURVEY 3 Press the Comport button to set up the Com Port of your computing device BAM JOGE NHASGATIIHR LC TH NS METEEN ram 2 GUT siy ere varan cum 4 A dropdown List will then appear as follows DGPS Viewer PC220 BAN JOGE BAWIDATION IHE un I JAE rak vr dax e Porre vm ccm ome rumen anni nm Select an appropriate Com Port here Referring to the Fig 2 there are four comports for you to select In our example we connect the DGPS 220 PC with our computing device through the Com Port 1 so we select COMI here by double clicking it Note If you use other comport such as the Com Port 2 for connection you must select COM2 accordingly 16 IS AN JO SE N AVIG AT IO N INC x Piro fessionsil im aviga io amp om m unication 5 The program will then ask you to select an appropriate baud rate In line with general GPS configuration we strongly recommend you to select 4800 here by double clicking it ga Hum ae Aa aa ol 6 configuration you have done vvill then display at the SERTAL PORT of the NAVIGATION window as shown below 17 4 SAN JO S E Pro fe s s ro nea i n N AVIG AT IO N Navig ation amp Com m unication Tips To enlarge one of the four windows just press the corresponding button at the menu bar in the top of the main screen For instance
39. terrupted 17 VDOP n a Note 00 00 is output unless 5 3D positioning is performed Interpreting Example 2D 3D Auto switching Mode 3D Positioning Satellites used 01 02 03 PDOP 2 00 HDOP 3 00 VDOP 4 00 42 SAN JOSE NAVIGATIO NW INC Professional in ga io amp Com m unication 6 3 5 GPGSV out Satellite Details Example GPGSV A yl 06 01 05 2234 56 Fields 1 2 B 4 2 6 7 04 1 223 44 Field 8 9 10 11 01 375 3088 332 Field 12 13 14 15 01 42 234 48 CRLF Field 16 17 18 19 Description Range Bytes 1 Total No of Messages 1 3 0 1 2 No of Message 1 3 0 1 3 No of satellites 1n line of site 00 12 0 20 with elevation angle higher than 5 degrees only 4 1 Sat SV 01 32 0 20 5 1 Sat Elevation Angle 05 90 0 20 6 1 Sat Bearing Angle 000 359 0 30 7 1 Sat SNR Signal Noise 00 99 211 Ratio C No 8 11 2nd Sat Details 12 15 3rd Sat Details 16 19 4 Sat Details JO SE NAV IG A TIO N 1IN I e Professionals in Navigation amp Com m unication 6 3 6 GPVTG out Course amp Speed Example GPVTG 012 3 T 001 1 M 001 2 N 0002 2 K CR LF Field 1 3 5 7 Description Range Bytes True Course 012 3 degree 000 0 359 9 variable T True T Note A null field is ou
40. tput unless 1 true course information is available 3 Magnetic Course 001 1 degree 000 0 359 9 variable M Magnetic M Note A null field is output unless 010 magnetic course information is available 5 Speed kts 001 2 speed kts 000 0 999 9 variable N kNot N Note A null field is output unless 010 speed information is available 7 Speed km h 0002 2 speed km h 0000 0 9999 9 variable K Km h K Note A null field is output unless 010 speed information is available JO SE WAV 16 A TIO N 1IN I Professional in Navigation amp Communication 6 3 7 GPRMC out UTC Position Course Speed etc Example GPRMC 123456 A 3444 1234 N 13521 4567 E Field 1 2 3 5 005 6 123 5 020195 001 0 W Field 7 8 9 10 FF CR LF Field Checksum Description Range Bytes 1 UTC Time 12 hh 00 23 20 34 mm 00 59 2 56 55 00 59 20 2 Status Aor V DO 10 A Stand alone or DGPS positioning V Positioning interrupted 3 Latitude 34 degree 0 90 at 44 minute integer 0 59 20 1234 minute fraction 0000 9999 40 N North South 8 IBN 5 Longitude 135 degree 000 180 030 21 minute integer 00 59 20 4567 minute fraction 0000 9999 40 E East West E or W O10 7 Speed kts
41. xact location and 5 the intentional degradation of the satellite signal by the DOD This intentional degradation of the signal is known as Selective Availability SA and is intended to prevent adversaries from exploiting highly accurate GPS signals and using them against the United States or its allies However on May 1 2000 U S President Bill Clinton ordered Selective Availability SA turned off at midnight Coordinated Universal Time Now civilian GPS users around the world will no longer experience the up to 100 meter approximate 300 feet random errors that SA added to keep GPS a more powerful tool for the military Today GPS units are accurate to within 20 meters approximately 60 feet although in good conditions units should display an error of less than 10 meters The combination of these errors in conjunction with poor satellite geometry can limit GPS accuracy to 100 meters 9590 of the time and up to 300 meters 590 of the time Fortunately many of these errors can be reduced or eliminated through a technique known as Differential 12 Whatis DGPS DGPS works by placing a high performance GPS receiver reference station at a known location Since the receiver knows its exact location it can determine the errors in the satellite signals It does this by measuring the ranges to each satellite using the signals received and comparing these measured ranges to the actual ranges calculated from its known position The difference b
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