GPS/GLONASS receiver GNS702 Datasheet V1.2
Contents
1. 3 Download file There are just two files covering all GPS satellites The first file MTK7d EPO is for 7 days 53 the other is 106Kbytes for 14 days MTK14d EPO 7 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 4 Parse file using software example This is quite easy there must be added some header bytes and a checksum and a control counter GNS offers software support on this 5 Download to GNS702 receiver Please refer to the GPS GLONASS NMEAcommandInterface manual for details If the host has low memory available there s no need to save the whole file The steps 3 5 can be done frame by frame needing less than 2kBytes of buffer memory Code samples and support for several platforms are available from GNS in preparation Thanks to the predicted system download data stay valid for up to 14 days Therefore users can initiate the download everytime and benefit from using W LAN instead of using expensive GSM File size will be 5OkBytes for a one week prediction data set AGPS characteristics System A 6hrs predicted data File size for data download 53 kB 1 week prediction data Maximum predictiontime 7 14 19 TIFF sec Time and last position available TIFF 15 X sec Last position available 3 8 EASY self generated prediction dat2. 22 21 RELATED DOCUMENTS 22 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 3 FUNCTIONAL DESCRIPTION 3 1 System description The GNS702 is a high performance low power GPS GLONASS receiver that includes an integrated RF frontend SAW Filter LNA and a finely tuned 5 2x3 7x0 7mm ceramic chip antenna Due to high input sensitivity and integrated low noise amplifier LNA it can work at weak GPS GLONASS signals GNS702 is a complete autonomous GPS GLONASS receiver including Full GPS GLONASS processing without any host processing requirements Standard NMEA message output powerful NMEA command and control interface All clock sources integrated frontend integrates low noise amplifier LNA and a SAW filter Rich additional features like geofencing single sentence output last position retention magnetic variation distance calculation Interface for UART PPS output pin Fix Status Indicator pin 3 2 Block diagram GPS GLONASS chip antenna SAW filter Low Noise Amplifier GPS GLONASS chip 32 768kHz crystal VBACKUP 4 16 368MHz TCXO GND 3 8 11 12 A GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 3 3
3. GPS GLONASS m NMEAcommandinterface manual Detailed description of NMEA commands GNS702 StarterKit user manual Available from www forum gns gmbh com www forum gns gmbh com based evaluation kit NMEA protocol Detailed description of NMEA protocol User manual for the GNS702 receiver www forum gns gmbh com 22 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 9 GNS GMBH 2013 THE INFORMATION IN THIS DOCUMENTATION DOES NOT FORM ANY QUOTATION OR CONTRACT TECHNICAL DATA ARE DUE TO BE CHANGED WITHOUT NOTICE NO LIABILITY WILL BE ACCEPTED BY THE PUBLISHER FOR ANY CONSEQUENCE OF THIS DOCUMENT S USE REPRODUCTION IN WHOLE OR IN PART IS PROHIBITED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COPYRIGHT OWNER 23 GNS GmbH 2013 V 1 2 Apr 5 2013
4. v T n d iri PLAT 16 ORDERING INFORMATION Ordering information Type A X Pat J labelmarking Description GNS702receiver FWV gt Firmware version GNS702 4037735104907 YYWW gt date code SN gt serial number 17 FCC COMPLIANCE This product has passed FCC 911 compliance successfully The module emission and immunity has been proven to be compliant However applications using this module as a component must pass CE and or FCC again in whole 21 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 18 ENVIRONMENTAL INFORMATION This product is free of environmental hazardous substances and complies with 2002 95 EC RoHS directive RoHS COMPLIANT 2002 95 19 MOISTURE SENSITIVITY This device must be prebaked before being put to reflow solder process Disregarding may cause destructive effects like chip cracking which leaves the device defective Shelf life 6 months sealed Possible prebake recommendations 12 hrs 60 C Floor life time from prebake to solder process 20 DOCUMENT REVISION HISTORY 11 2013 M Reiff initial document Mar 14 2013 M Reiff Backup current value corrected PPS direction corrected at block diagram Label marking EREIN changed Related documents updated 21 RELATED DOCUMENTS Description file
5. SNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 1 INTRODUCTION GNS702 is a small autonomous GPS GLONASS receiver based upon the MediaTek MT3333 single chip available with a finely tuned high sensitivity ceramic chip antenna The receiver supports GPS and GLONASS simultaneously The navigation performance and accuracy is further improved by using correction data from SBAS WAAS EGNOS GAGAN MSAS QZSS First Fixes after just a few seconds are achieved with the help of A GPS using EPO Extended Prediction Orbit and the EASY self generated orbit prediction algorithm EASY Embedded Assist System does not require any resources or assist data from the host The excellent low power design makes it easy to implement this receiver in power sensitive battery supplied applications The new AlwaysLocate power management feature will improve this behaviour additionally It adaptively adjusts power consumption depending on the environment and motion conditions in order to achive a balance between fix rate power consumption and position accuracy Very low power requirements typ 93mMW 3 3V tracking for GPS GLONASS and internal voltage regulator makes it easy to run the receiver with various power supplies and allows direct connection to LiIon batteries GNS702 offers the industry s highest level of navigation sensitivity up to 165dBm It has superior dynamic perform
6. Satellite Based Augmentation SUPPONE EEE ER ESS SSSR RS CSSS Sn e enend dne 9 3 11 single sentence DULpUE esse ima sees eases nine sine 9 9 12 ESS DOS MIO Ce FC isa i git et MC E 10 Ala Goorencing FUHCLIOT eseseseeesdqenstetiudeosciinetuiqemseeinie du dudenincnitc didt tudiude 10 3 14 Senensi SSSR RS ESS Needle 10 3 15 Distance Calculation feature 6 29 6 10 3 16 GPS GLONASS almariac and ephemeris data sense Sens nee 10 3 17 Real tire Clock RIC mi iia te i eai ei ia 10 3 18 D ART a a a a a a a aa a a aa a a a 10 3 19 Module del9Sult settndgs sessions 11 4 TYPICAL APPLICATION BLOCK DIAGRAM 12 4l Typical System ani 12 S GPS GLONASS CharagteriS s esse Sense RSR Sn nes penses Rss 13 Bik GPS GLONASS Characteristics rss Rose essei 13 6 DESIGN GUIDELINES 14 7 ELECTRICAL SPECIFICATION 14 Absolute Maximum Ratings nee sense ne E a a aa a a ae aa aaa a a 14 Jee Recommended Operating Ceraditlo Seeeccesce
7. GPS and GLONASS simultaneous operation GNS702 supports tracking of the GPS and the GLONASS satellite system at one time This feature enhances the overall performance significant e Increased availability of number of satellites e Increased spatial distribution allows better geometrical conditions e Reduced Horizontal HDOP and Vertical Dilution of Precision VDOP factors In GPS only operation a minimum of 3 SVs is needed to determine a 2D position fix solution When using both systems 5 SVs are needed to determine the four unknowns and one more SV to calculate the GPS GLONASS time offset Using a combined receiver users have an access to potentially 48 or more satellites This high number of satellites can overcome the typical problems of restricted visibility of the sky such as in urban canyons or indoor scenarios 3 4 Power Management Features Power management schemes implemented for any GPS system requires an optimally tuned performance for both accuracy of the position fixes and the average power consumed for best user experience GNS702 architecture achieves these both aspects by providing flexibility and design choices for the system integration based on wide range of use cases and by leveraging on the proven silicon methodologies Also GNS702 provides position velocity and time measurements without any host loading This coupled with the optional built in power management options reduces the overall system power budget Selecta
8. is permanently stored inside GNS702 module even if all power supplies have been removed When the receiver is powered up again the data will be used to allow a quick re acquisition as soon as a coarse time information is available Time will be available immediately when RTC is kept running 3 17 Real time clock RTC GNS702 has a real time clock with 32 768Hz crystal on board As long as VBACKUP is connected to a power source the real time clock and the module memory can be kept alive at very low power consumption of just 15uA The RTC will track the current time and enable the module to start from sleep states with very fast time to first Fix TTFF 3 18 UART interface GNS702 core and I O sections work at 3 3V nominal Absolute Maximum Ratings should not be exceeded Should the GNS702 be interfaced to a host with I O at higher lower levels level shifters should be used UART baud rate is 9600baud by default The baud rate can be modified to higher rates by a NMEA software command See document GPS GLONASS NMEAcommandalInterface manual for details UART Default Settings 10 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 3 19 Module default settings The GNS702 receiver comes with default settings which are persistently programmed Whenever power is removed from the module both VCC and VBACKUP the settings will be reset to the v
9. second On request PPS output can activated on a 2D fix or after power up of the module providing a time accuracy decreased PPS signal Ti 100ms T2 1sec GNS702 module provides an exceptionally low RMS jitter of typical 10 nanoseconds PPS characteristics based upon a 3D fix 1PPS pulse duration 2100 mec 1PPS time jitter Pulse rising edge deviation from nsec i 10 RMS expected pulse time measured with full 3D fix 1PPS rise and fall time 5 msec 10 90 load is 10k 5pF 3 10 SBAS Satellite Based Augmentation support GNS702 supports Satellite Based Augmentation for improvement of the navigation precision Correction data is sent from geostationary satellites to the GPS GLONASS receiver GNS702 supports European US and Asian augmentation systems EGNOS WAAS GAGAN MSAS QZSS to enable precision improvements in nearly every region of the world SBAS is active by default and will automatically track the available SBAS satellites It can be disabled by NMEA command See document GPS GLONASS NMEAcommandadliInterface manual for details Note In SBAS mode the maximum NMEA sentence update rate is limited to 5 per second 3 11 Single sentence output GNS702 allows to reduce data transfer to host to a minimum Reduced data transfer can save host processor activity times and thus reduce system power consumption relevant information will be provided in a single sentence output To save further c
10. 157542 65 dessus M 000000 Datum y WGS84 O AGPS rr 7 14 days Configurable Z Output data frequency 1 10 1 1 Navigation amp tracking sensitivity 165 dBm autonomous Acquisition sensitivity 1 148 X dBm jColdstat o Reacquisition sensitivity 163 dBm JjHotstat Z o TTFF hotstart O 5 X AlSVsQ 130080nm autonomous warm start 33 5 All SVs 130dBm autonomous cold start 35 59 All SVs 130dBm Reacquisition timet 1 1 i1 sec All SVs 130d8m Number of channels tracking 33 J O Number of acquisition channels 99 J Dimension 16x16x21 Tolerance is 0 2 mm Weight I oo Power consumption GPS ACTIVE acquisition NMEA frequency 1 sec SBAS enabled MTAIC enabled igs S NMEA frequency 1 sec SBAS enabled MTAIC enabled m s GPS ACTIVE tracking Without aid 2D RMS Using SBAS 2D RMS 35 28 Backup current 3V 15 3 ES e Without aid Using SBAS m s Operation altitude Operation velocit Operation acceleration Note based on chip specifi
11. Byte Flash memory able various events 3 6 Active interference cancellation MTAIC Because different wireless technologies like Wi Fi GSM GPRS 3G 4G Bluetooth are integrated into portable systems the harmonic of RF signals may influence the GPS reception The multi tone active interference canceller can reject external RF interference which come from other active components on the main board thus improving the performance of GPS reception GNS702 can cancel up to 12 independent continuous wave CW channels having signal levels of up to 80dBm The functionality is enabled by default and increases power consumption by about 1mA 3 7 AGPS with EPO data AGPS assisted GPS allows to shorten TTFF TimeToFirstFix by injecting ephemeris data from an external source into the module s memory With the help of these data the module does not need to acquire satellite positions by receiving the data from the satellites Depending on time and position information that is still available in the module memory the TTFF can be reduced to just a few seconds The GNS AGPS service is based on a short term predicted data service The predicted data will be fully processed by the GPS engine The host must load the data from the web and transfer them over the UART into the module 1 Check GNS702 module EPO Extended Prediction Orbit data for validity by comparing the time 2 Connect to web server through network connection GPRS WLAN LAN
12. C Not connected gt 0 0 0 3 JGND P jGround 4 4 D 4 VBACKUP Backup power input for RTC amp navigation data keep This connects to the backup power of the GPS module Power source such as battery connected to this pin will help the GPS chipset in keeping its internal RTC running when the main power source is turned off The voltage should be kept between 2 0V 4 3V Typical 3 0V If VBACKUP power was not reserved the GPS receiver will perform a lengthy cold start every time it is powered on because previous satellite information is not retained and needs to be re transmitted This pin must be connected for normal operation 5 1PPS Time Mark Output 2 8V CMOS Level This pin provides one pulse per second output from the module and synchronizes to GPS time Keep floating if not used 3D FIX 3D Fix Indicator The 3D FIX is assigned as a fix flag output If not used keep floating Before 2D Fix The pin will continuously toggle with 1Hz output one second high level and one second low level signal After 2D or 3D Fix The pin will continuously output low level signal This pin may not connected to high level at power on sequence NC Not connected J 00000 GND P _ Grud O LO This is the UART A transmitter of the module It outputs GPS information for application This is the UART A recei
13. a feature GNS702 includes an internal prediction system that allows to sample satellite orbit data during operation and use that data to speed up TTFF on later starts The prediction time frame is up to three days forward Although this prediction feature does not provide the very short TTFF that is achieved using AGPS it can help to find a fix solution faster and in weak signal condition scenario Prediction data will be kept in memory as long as VBACKUP is present This option is activated by default Note The EASY functionality is only supported if VBACKUP pin is conntected and the NMEA update rate is 1Hz EASY Day 1 Day 2 Day 3 3 GPS GPS on with GPS on with GPS on with EASY M EASY M assist EASY assist EASY assist EASY M EASY Mon TTFF Using Received Using penodic ON new EPH periodic ON free time to EASY free time to 30 sec d use di calculate Re Gen calculate v 5 sec idet 8 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 3 9 Pulse Per Second PPS GNS702 provides a Pulse Per Second PPS hardware output pin for timing purposes After calculation of a 3D position fix default setting the PPS signal is accurately aligned to the GPS second boundaries The pulse generated is approximately 100 milliseconds in duration and the repetition rate is 1
14. alues shown in the following table Default settings Default value UART setting 9600 8 N 1 Fix frequency update rate 1 sec NMEA sentences Refer to chapter NMEA output sentences NMEA rate Once a second RMC GSA VIG GGA every 5 sec GSV sentences DGPS option SBAS enabled Datum WGS 84 MTAIC enabled Logging parameters Full amp Stop Content Basic Interval 15 sec Single sentence output Customized firmware needed Last position retention Customized firmware needed Magnetic variation Customized firmware needed Geofencing function Customized firmware needed Distance calculation Customized firmware needed On request other options can be selected as preprogrammed persistent default options Please contact the GNS support for your project requirements Note Customized options are solely available for fixed order lots 11 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 4 TYPICAL APPLICATION BLOCK DIAGRAM 4 1 Typical System Overview Mobile device Power Management 2 Host Processor MMI GNS70 UART RX keys display UART TX 12 GNS GmbH 2013 V 1 2 Apr 5 2013 wa GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 5 GPS GLONASS characteristics 5 1 GPS GLONASS characteristics Parameter Min Typ Max Unit Note general Frequency
15. ance at high velocity and provides effective protection against interference signals using MTAIC Multi tone active interference canceller Up to 12 independent channel interference continious wave jammers lt 80dBm can be eliminated or reduced The embedded logger function LOCUS with a 16 hrs on chip memory makes this GPS module a complete track logger for many applications With AlwaysLocate data logging can be achieved up to 32 hrs under standard conditions In professional timing applications the outstanding high accuracy PPS pulse per second hardware pin is used for synchronization to GPS second Typical accuracy is 10ns Note Based on chip specifications GNS GmbH 2013 V 1 2 Apr 5 2013 SNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification Features e GLONASS and GPS simultaneously e 99 acquisition 33 tracking channels e Ultra high tracking navigation sensitivity 165dBm e Smart antenna finely tuned 5 2x3 7x0 7mm ceramic chip antenna e SBAS WAAS EGNOS MSAS GAGAN QZSS correction support e A GPS by EPO Extended Prediction Orbit enables 7 14days prediction e 12 Multitone Active Interference Canceller MTAIC for GPS in band jammer rejection e EASY Self generated orbit prediction support e AlwaysLocate Intelligent Algorithm for power saving e High accuracy 1PPS output e NMEA 0183 or binary protocol e High update rate up to 10 s e Embedd
16. ble Power management features e In Standby mode RF frontend and internal MPU are switched to deep sleep state Power consumption is reduced This state can be entered by sending the NMEA command PMTK161 0 28 CR LF Leaving standby mode and resuming to normal operation will be managed by sending any byte to the module Standby Mode Software an HOST side sends any byte to wake up from standby mode GPS on GPS off M GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification e Backup mode be entered by sending NMEA command PMTK225 4 2F CR LF The GPS core will shut down autonomously to backup state Vcc supply can now be switched off by an external power supply switch e Periodic mode describes a power mode which will autonomously power on off the module in programmable time slots with reduced fix rate Periodic mode is useful during stationary operation or if position fixes are just needed from time to time Since power consumption in GPS off times is nearly zero the power consumption in periodic mode can be estimated by Ptracking i ton ton toff Periodic mode is controlled with NMEA command PTMK225 See document GPS GLONASS_NMEAcommandInterface manual for programming details Periodic Mode Power GPS on on on on GPS off off off off off e AlwaysLocate feature provides an opt
17. cations 13 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 6 DESIGN GUIDELINES Although GNS702 GPS GLONASS receiver provides best performance at low power consumption Special care should be taken to provide clean signal and clean power supplies Power lines should be blocked near to the receiver with low ESR capacitors Radiated noise from neighbour components may also reduce the performance of the receiver Please refer to GNS702 Starter Kit User Manual for more informations downloadable at the GNS forum www forum gns gmbh com 7 ELECTRICAL SPECIFICATION 7 1 Absolute Maximum Ratings Parameter i Value Unit Supply voltage range Vcc 3 0 to 4 3 Backup voltage VBACKUP 2 to 4 3 7 2 Recommended Operating Conditions Note Backup voltage for RTC and memory retention must be available during normal operation 14 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 8 PIN CONFIGURATION Top View VCC GND NC GND VBACKUP 3D FIX PPS NC GND TX GND Top view Pin Name 1 0 Description amp Note 1 Main DC power input The main DC power supply for the module The voltage should be kept between from 3 0V to 4 3V The ripple must be limited under 50mVpp Typical 3 3V 2 N
18. ed logger function with 16hrs internal memory e GPS current consumption 03 3V Acquisition 35mA Typical Tracking 28mA Typical e Low backup current consumption 7uA typical e SMD type with stamp holes e Small form factor 16x16x2 1mm e CE FCC and RohS certified Note Based on chip specifications 2 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 2 INDEX 1 INTRODUCTION 1 2 INDEX 3 3 FUNCTIONAL DESCRIPTION 4 cM SCF CS SC iO 4 C EN HAT 4 3 9 GPS GLONASS simu ultaneols sesesesseeepeeseseseeecsuee ore seas se sees sears e ee soca sa ae ees 5 34 PoWerManagement Features Eee Se RS niak SR SRE SSSR SR eee 5 B50 LOGO ee NE MM 7 3 6 Active interference cancellation MATE sn iiie ra Gies niis cent iit irn NES 7 0 1 AGPS With EPO 7 3 8 EASY self generated prediction data feature 8 3 9 Pulse Per Second PPS 2eme nest annee ennemies nire dta ini 9 3 10 SBAS
19. encesune nee seen ere seen sans 14 8 PIN CONFIGURATION 15 9 PHYSICAL DIMENSIONS 16 10 RECOMMENDED PAD LAYOUT 17 11 RECOMMENDED PCB LAYOUT 18 12 NMEA DATA interface 18 12 1 NMEA Output SENTENCES esse ESS SSSR ASS SERA RES RS RSS E a Ses Re RSR RSS ne nn 19 12 2 NMEA command Inten acE 19 13 MATERIAL INFORMATION 20 14 RECOMMENDED SOLDERING REFLOW PROFILE 20 15 TRAY PACKAGE INFORMATION 21 16 ORDERING INFORMATION 21 17 COMPLIANCE 21 18 ENVIRONMENTAL INFORMATION 22 19 MOISTURE SENSITIVITY 22 20 DOCUMENT REVISION HISTORY
20. ground plane will extend For optimized GPS GLONASS sensitivity it is adviced to place the GNS702 on the PCB boundary Do not place the GNS702 near metall components 12 NMEA DATA interface GNS702 provides NMEA National Marine Electronics Association 0183 compatible data A set of proprietary NMEA commands are available to send control messages to the receiver These commands are described in a separate document GPS GLONASS NMEAcommandInterface manual For standard operation no commands are needed the module will start outputting NMEA sentences after power supply has been attached GNS702 will always start communication output with 9600 bit per second If non standard options are needed f e other baud rate other NMEA sequence they can be programmed from host controller during runtime Important note Options set by using NMEA command interface are not persistent They will be lost when power is removed A backup supply at VBACKUP will be sufficient to keep them 18 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 12 1 NMEA output sentences NMEA output sentences Recommended Minimum Navigation Information Fix Data Time Position and fix related data Geographic Position Latitude Longitude GSA DOP and active satellites Course and Speed Information relative to the Ground Satellites in view NMEA output sentences inden
21. hannel load the sentence can be formatted as binary Need of firmware customization 9 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 3 12 Last position retention Depending on the application it might be useful to retain the last position or to clear the position when having no fix solution Last position retention can be enabled or disabled When enabled the last known position is outputted in the NMEA sentences Need of firmware customization 3 13 Geofencing function GNS702 has an internal algorithm to determine whether the actual position is within a circular area around a predefined location point A proprietary sentence indicates the inside or outside status Need of firmware customization 3 14 Magnetic variation feature As the magnetic variation feature is enabled data output provides informations about the degree of magnetic variation and the measured magnetic heading Need of firmware customization 3 15 Distance calculation feature This feature allows to request the real line of sight distance in relation to a predefined position This feature can remove some load from the host processor Need of firmware customization 3 16 GPS GLONASS almanac and ephemeris data For quick re acquisition of the GPS GLONASS receiver after off times the GPS GLONASS engine should have access to almanac and ephemeris data This data
22. imized overall GPS GLONASS system power consumption in tracking mode under open sky conditions Always Locate is an intelligent control of periodic mode Depending on the environment and motion conditions GNS702 can adjust the on off time to achieve balance of positioning accuracy and power consumption The best power saving will be made under good reception in stationary mode Critical reception conditions and dynamic movements will need full activity of the GNSS engine which causes nominal power requirements 28mA typ in tracking mode Power Consumption Highway driving Urban Outdoor office driving Ma Eli diatom DO SEE 6 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 3 5 Logger function GNS702 provides an autonomous logger function that automatically stores position information in an internal 128kB flash memory A complete tracking unit can be realized without any external CPU or memory The parameters for logging are programmable via the NMEA command interface The following parameter can be set to optimize logging time logger rate The commands for logger include start logging stop logging erase memory readout memory please refer to the GPS GLONASS NMEAcommandalInterface manual for details Internal Logger Function Logger data rate 1 15 1 Jis 1 O Logger data memory 128 jk
23. tifier retlated to its GNSS system NMEA output identifier GGA GSA GSV ve GPS GPGGA GPGSA GPGSV GPRMC GPVTG GPS GLONASS GPGGA GNGSA GPGSV GPRMC or GPVTG GLGSV GNRMC Note1 Before 3D fix RMC output is GPRMC after 3D fix it changes to GNRMC Refer to NMEA protocol document available at GNS forum www forum gns gmbh com for more informations 12 2 NMEA command interface GNS702 NMEA command interface allows to control settings and the extended functions The command interface specification is available in an extra document GPS GLONASS NMEAcommandInterface manual Two groups of commands are available Setting commands do modify the behavior of the module Note Modified settings will be valid as long as the module is powered through VCC or VBACKUP f e setting of a new baud rate After removing VCC and VBACKUP all settings are reset to their default values Action commands will perform the specified action one time after the command has been received f e request for cold start Commands are always started with PTMK directly followed by the command number 000 999 Each command must be terminated by lt chksum gt and a CR LF The checksum calculation is simple just XOR all the bytes between the and the not including the delimiters themselves Then use the hexadecimal ASCII format 19 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS recei
24. ver Datasheet V1 2 GNS702 preliminary specification 13 MATERIAL INFORMATION Complies to ROHS standard ROHS documentations are available on request Contact surface gold over nickel 14 RECOMMENDED SOLDERING REFLOW PROFILE T C max 250 C for 10 sec max B BEEN 200 160 C gt 190 C 120 sec reflow sq 100 fo 4 100 200 t sec Notes 1 GNS702 should be soldered in upright soldering position In case of head over soldering please prevent shielding GNS702 receiver from falling down 2 Do never exceed maximum peak temperature 3 Reflow cycles allowed 1 time 4 Do not solder with Pb Sn or other solder containing lead Pb 5 This device is not applicable for flow solder processing 6 This device is not applicable for solder iron process 20 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 15 TRAY PACKAGE INFORMATION The GPS receivers are placed on a tray The trays will be stacked and packed together The trays are placed inside an antistatic bag P H 1 Pall ty Wn Gu tas tee m JAE Iu f Ht Aum i ny es du iin b t y dup n E e AM il u EM re ie t Pu D E r Pu A Y MW an Tif n LA 9 ee MITTIT 1420 AXE WENT i il P fa MUN t LI gt l
25. ver of the module It is used to receive commands from system 11 GND P s 49 12 GND Grown gt s 294 1 I INPUT OUTPUT I O BIDIRECTIONAL P POWER PIN ANA ANALOG PIN mE 15 GNS GmbH 2013 V 1 2 Apr 5 2013 GNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 9 PHYSICAL DIMENSIONS TOP VIEW all units in mm tolerance is 0 2 8 90 16 00 14 40 Antenna shielding Cover 16 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 10 RECOMMENDED PAD LAYOUT all units in mm Footprint Top View Clearance Area 173 50 16 00 Top view Note Clearance Area To achieve GPS GLONASS chip antenna performance it is necessary to remove all metallization from all PCB layers 17 GNS GmbH 2013 V 1 2 Apr 5 2013 A GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 2 GNS702 preliminary specification 11 RECOMMENDED PCB LAYOUT To achieve GPS GLONASS chip antenna performance it is necessary to remove all metallization from all PCB layers Beside the clearance area it is recommended to place a solid minimum 20x20mm ground plane see picture below GPS and GLONASS sensitivity will improve if the solid
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