GNS701 datasheet
Contents
1. 7 3 6 Active interference cancellation MTAIC 7 3 7 AGPS with EPO data 7 3 8 EASY self generated prediction data feature 8 3 9 Pulse Per Second PPS 9 3 10 SBAS Satellite Based Augmentation Support 9 3 11 DGPS Differential GPS support 9 3 12 Single sentence output 10 3 13 Last position retention 10 3 14 Geofencing function 10 3 15 Magnetic variation feature 10 3 16 Distance calculation feature2. 10 3 17 GPS GLONASS almanac and ephemeris data 10 3 18 Real time clock RTC 7 92 nnn nn nnn nnn nnn nnn nnn nnn eee 10 3 19 UART interface nn nnn n nn nnn nnn nnn nnn nnn eee 11 3 20 Module default settings 11 4 TYPICAL APPLICATION BLOCK DIAGRAM 12 4 1 Typical System Overview 12 5 GPS GLONASS characteristics 13 5 1 GPS GLONASS characteristics 13 6 DESIGN GUIDELINES 14 7 ELECTRICAL SPECIFICATION 14 7 1 Absolute Maximum Ratings 14 7 2 Recommended Operating Conditions 14 8 PIN CONFIGURATION 15 9 PHYSICAL DI
3. Distributed by GGNS en www texim europe com GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 1 INTRODUCTION GNS701 is a small autonomous GPS GLONASS receiver based upon the MediaTek MT3333 single chip available with a finely tuned high sensitivity patch ceramic 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 or DGPS RTCM 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 66mW 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 Lilon batteries GNS701 offers the industry s highes
4. 1PPS output e NMEA 0183 or binary protocol e High update rate up to 10 5 e Embedded logger function with 16hrs internal memory e GPS current consumption 3 3V Acquisition 35mA Typical Tracking 22mA Typical e Low backup current consumption 15uA typical e SMD type with stamp holes e Small form factor 19 5x19 5x7 2mm e CE FCC and RohS certified t note Based on chip specifications 2 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 2 INDEX 1 INTRODUCTION 1 2 INDEX 3 3 FUNCTIONAL DESCRIPTION 4 3 1 System description 4 3 2 Block diagram 4 3 3 GPS and GLONASS simultaneous operation 5 3 4 Power Management Features 5 3 5 Logger function
5. dBm autonomous Acquisition sensitivity 148 dBm Cold start Reacquisition sensitivity 163 dBm Hot start TTFF hotstart 1 sec All SVs 130dBm TTFF autonomous warm start 34 sec All SVs 130dBm TTFF autonomous cold start 35 sec All SVs 130dBm Reacquisition time lt 1 sec All SVs 130dBm Number of channels tracking 33 Number of acquisition channels 99 Dimension 19 5x19 5x7 2 mm Tolerance is 0 2 mm Weight 8 g Power consumption GPS ACTIVE acquisition 35 mA NMEA frequency 1 sec 3 3V SBAS enabled MTAIC enabled GPS ACTIVE tracking 22 mA NMEA frequency 1 sec 3 3V SBAS enabled MTAIC enabled Backup current 3V 15 uA Accuracy Position error 50 CEP 3 m Without aid 2D RMS Position error 50 CEP i 2 5 z m Using SBAS 2D RMS Velocity error 0 1 m s Without aid Velocity error 0 05 m s Using SBAS R limits Operation altitude 18 000 m Operation velocity i 515 m s Operation acceleration 7 4 G 1 note based on chip specifications 13 GNS GmbH 2013 V 1 1 Apr 11 2013 Gi SNS OBAL NAVIGATI ION SYS STEMS GPS GLONASS receiver GNS 701 Datasheet V1 1 6 DESIGN GUIDELINES preliminary specification Although GNS701 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 Radia
6. 13 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 3 3 GPS and GLONASS simultaneous operation GNS701 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 GNS701 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 GNS701 provides position velocit
7. 2 MATERIAL INFORMATION Complies to ROHS standard ROHS documentations are available on request Contact surface gold over nickel 19 GNS GmbH 2013 V 1 1 Apr 11 2013 OBAL NAVIGATION SYSTEMS GNS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 13 RECOMMENDED SOLDERING REFLOW PROFILE C 300 KS max 250 C for 10 sec max 30 C for 40 sec max 200 100 100 200 t sec Notes 1 GNS701 should be soldered in upright soldering position In case of head over soldering please prevent shielding GNS701 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 1 Apr 11 2013 GNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 14 TRAY PACKAGE INFORMATION The GPS receivers are placed on a tray for quantities below 100 pieces The trays will be stacked and packed together The trays are placed inside an antistatic bag Tape information 19 9 0 1mm FTT ay de 15 TAPE amp REEL INFORMATION 2 0 1mm 1 0 Imm 19 90 0 Imm 0 5T0 e 0 1mm 21 GNS GmbH 2013 V 1 1 Apr 11 2013 GLOBAL NAVIGATION SY
8. MENSIONS 16 10 RECOMMENDED PAD LAYOUT 17 11 NMEA DATA interface 18 11 1 NMEA output sentenceS 18 11 2 NMEA command interface 19 12 MATERIAL INFORMATION 19 13 RECOMMENDED SOLDERING REFLOW PROFILE 20 14 TRAY PACKAGE INFORMATION 21 15 TAPE amp REEL INFORMATION 21 16 ORDERING INFORMATION 22 17 FCC COMPLIANCE 23 18 ENVIRONMENTAL INFORMATION 23 19 MOISTURE SENSITIVITY 23 20 DOCUMENT REVISION HISTORY 23 21 RELATED DOCUME
9. NTS 24 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver GNS 701 Datasheet V1 1 3 FUNCTIONAL DESCRIPTION 3 1 System description The GNS701 is a high performance low power GPS GLONASS receiver that includes an integrated RF frontend SAW Filter LNA and a finely tuned 18x18x4mm ceramic patch antenna Due to high input sensitivity and integrated low noise amplifier LNA it can work at very weak GPS GLONASS signals GNS701 is a complete autonomous GPS GLONASS receiver including preliminary specification Full GPS GLONASS processing without any host processing requirements Standard NMEA message output A powerful NMEA command and control interface Al clock sources integrated RF frontend integrates a 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 VCC Resi ENABLE 6 VBACKUP Ww GPS patch antenna SAW filter Low Noise Amplifier stor I 3V LDO Reset GPS GLONASS chip 32 768kHz crystal 16 368MHz TCXO 11 WIN oO 10 NRESET D Fix 1PPS TX1 RX1 TXO RX0 GND 2 12 4 GNS GmbH 20
10. STEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification Reel information 2 2 0 2 my 99 1 5mm 13 3 0 3 mm H H 44 5mm Number of devices 250pcs reel 16 ORDERING INFORMATION Ordering information Type Part label marking Description GNS701receiver GNS701 4037735104846 GNS701QYYWWSN YYWW gt date code SN gt serial number 22 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 17 ECC 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 18 ENVIRONMENTAL INFORMATION This product is free of environmental hazardous substances and complies with 2002 95 EC RoHS directive RoHS COMPLIANT 2002 95 EC 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 lt 72 hrs 20 DOCUMENT REVISION HISTORY V1 0 Jan 29 2013 M Reiff initial document Tape amp Ree
11. United Kingdom Gentsesteenweg 1154 C22 St Mary s House Church Lane Chauss e de Gand 1154 C22 Carlton Le Moorland B 1082 Brussel Bruxelles Lincoln LN5 9HS Tel 32 0 2 462 01 00 Tel 44 0 1522 789 555 Fax 32 0 2 462 01 99 Fax 44 0 845 299 22 26 belgium texim europe com uk texim europe com Justus von Liebig Ring 7 9 Martin Kollar Strasse 9 D 25451 Quickborn D 81829 M nchen Tel 49 0 4106 627 07 0 Tel 49 0 89 436 086 0 Fax 49 0 4106 627 07 20 Fax 49 0 89 436 086 19 germany texim europe com germany texim europe com mmm Austria Warwitzstrasse 9 A 5020 Salzburg Tel 43 0 662 216026 Fax 43 0 662 216026 66 austria texim europe com I exim Europe Elektrostraat 17 NL 7483 PG Haaksbergen Tel 31 0 53 573 33 33 info texim europe com www texim europe com
12. _NMEAcommandInterface manual for programming details Periodic Mode Power GPS on on on on GPS off off off off mmm off AlwaysLocate feature provides an optimized 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 GNS701 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 29mA typ in tracking mode Power Consumption Highway Urban Outdoor driving driving Mad Walking static 6 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 3 5 Logger function GNS701 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
13. art from sleep states with very fast time to first Fix TTFF 10 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver GNS 701 Datasheet V1 1 preliminary specification 3 19 UART interface GNS701 core and I O sections work at 3 3V nominal Absolute Maximum Ratings should not be exceeded Should the GNS701 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_NMEAcommandiInterface manual for details UART Default Settings Parameter Value Baud rate 9600 Data length 8 bits Stop bit 1 Parity None 3 20 Module default settings The GNS701 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 values shown in the following table Default settings Setting Default value UART setting 9600 8 N 1 Fix frequency update rate 1 sec NMEA sentences Refer to chapter 11 1 NMEA output sentences NMEA rate Once a second RMC GSA VTG GGA every 5 sec GSV sentences Self survey prediction mode EASY enabled Active interference cancellation MTAIC enabled DGPS option SBAS enabled Datum WGS 84 Logging parameters Full amp Stop Conten
14. d under 50mVpp Typical 3 3V GND 0 Ground 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 TXO Serial Data Output A for NMEA output TTL This is the UART A transmitter of the module It outputs GPS information for application RXO Serial Data Input A for Firmware update TTL This is the UART A receiver of the module It is used to receive commands from system ENABLE High active or keep floating for normal working Enable High 1 8 lt V enable lt VCC Disable Low OV lt V enable lt 0 25V 1PPS 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 leve
15. eb and transfer them over the UART into the module 1 Check GNS701 module EPO Extended Prediction Orbit data for validity by comparing the time 2 Connect to web server through network connection GPRS WLAN LAN 3 Download file There are just two files covering all GPS satellites The first file MTK7d EPO is for 7 days 53kB the other is 106Kbytes for 14 days MTK14d EPO 7 GNS GmbH 2013 V 1 1 Apr 11 2013 GGNS LOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 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 GNS701 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 S5OkBytes for a one week prediction data set AGPS characteristics System 6hrs predicted data File size for data d
16. er 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 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 T1 100ms T2 isec GNS701 module provides an exceptionally low RMS jitter of typical 10 nanoseconds PPS characteristics based upon a 3D fix 1PPS pulse duration 100 msec 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 nsec 10 90 load is 10k 5pF 3 10 SBAS Satellite Based Augmentation support GNS701 supports Satellite Based Augmentation for improvement of the navigation precision Correction data is sent from geostationary satellites to the GPS GLONASS receiver GNS701 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_NMEAcommandiInterface manual for details Note In SBAS mode the maximum NMEA sentence update rate is limited to 5 per second 3 11 DGPS Differential GPS support GNS701 accepts DGPS in
17. etlated to its GNSS system NMEA output identifier System GGA GSA GSV RMC VTG GPS GPGGA GPGSA GPGSV GPRMC GPVTG GPS GLONASS GPGGA GNGSA GPGSV GPRMC or GPVTG GLGSV GNRMC Notel Before 3D fix RMC output is GPRMC after 3D fix it changes to GNRMC GNS GmbH 2013 V 1 1 Apr 11 2013 18 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 11 2 NMEA command interface GNS701 NMEA command interface allows to control settings and the extended functions The command interface specification is available in an extra document GPS GLONASS_NMEAcommandiInterface 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 lt CR gt lt LF gt 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 1
18. l information added PPS direction at blockdiagram VII Apr 11 2013 M Reiff corrected Related documents updated Receiver default settings supplemented 23 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver GNS 701 Datasheet V1 1 21 RELATED DOCUMENTS preliminary specification Title Description file Available from GPS GLONASS NMEAcommandiInterface manual Detailed description of NMEA commands www forum gns gmbh com GNS701 Starterkit user manual User manual for the GNS701 receiver based evaluation kit www forum gns gmbh com NMEA protocol Detailed description of NMEA protocol www forum gns gmbh com 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 24 GNS GmbH 2013 V 1 1 Apr 11 2013 TEXIM EUROPE Partner in Electronic Components amp Supply Chain Solutions Elektrostraat 17 N rregade 15 NL 7483 PG Haaksbergen DK 9240 Nibe Te 31 0 53 5 73 33 33 Tel 45 88 20 26 30 Fax 31 0 53 573 33 20 Fax 45 88 20 26 39 nl texim europe com nordic texim europe com p Belgium na
19. l 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 9 TX1 Serial Data Output A for NMEA output TTL This is the UART transmitter of the module It outputs GPS information for application If not used keep floating 10 RX1 Serial Data Input A for Firmware update TTL This is the UART receiver of the module It is used to receive commands from system If not used keep floating li NRESET I Reset Input Low Active Low active it causes the module to reset If not used keep floating 12 GND P Ground 1 I INPUT O OUTPUT I O BIDIRECTIONAL P POWER PIN ANA ANALOG PIN 15 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 _ o 9 PHYSICAL DIMENSIONS TOP VIEW all units in mm tolerance is 0 2mm Glue 18 50 f PCB 19 50 H H e d wi Vi D Y Le x N Top View f Shielding Cover Sle ees El et Antenna ele ng O 1 00 16 GNS GmbH 2013 V 1 1 Apr 11 2013 OBAL NAVIGATION SYSTEMS GNS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 10 RECOMMENDED PAD LAYOUT all units in mm Footprint Top View 19 900 eg I 3 00 Note P
20. lace one hole diameter 3 0mm under this module for the antenna pad 17 GNS GmbH 2013 V 1 1 Apr 11 2013 SNS OBAL NAVIGATION SYSTEMS Gi GPS GLONASS receiver GNS 701 Datasheet V1 1 preliminary specification 11 NMEA DATA interface GNS701 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_NMEAcommandiInterface manual For standard operation no commands are needed the module will start outputting NMEA sentences after power supply has been attached GNS701 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 11 1 NMEA output sentences NMEA output sentences Type content RMC Recommended Minimum Navigation Information GGA Fix Data Time Position and fix related data GLL Geographic Position Latitude Longitude GSA DOP and active satellites VTG Course and Speed Information relative to the Ground GSV Satellites in view NMEA output sentences indentifier r
21. ownload 53 kB 1 week prediction data Maximum prediction time 7 14 days TIFF 1 sec Time and last position available TIFF 15 sec Last position available 3 8 EASY self generated prediction data feature GNS701 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 a DL _ gt o GPS on GPS on with GPS on with GPS on with EASY on EASY assist EASY assist EASY assist EASY on EASY on EASY on TTFF Using Received Using penodic ON new EPH periodic ON e free time to EASY free time to 30 sec tano calculate Re Gen calculate 5 sec tte sf en 00 5 8 GNS GmbH 2013 V 1 1 Apr 11 2013 GNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 3 9 Pulse Per Second PPS GNS701 provides a Pulse Per Second PPS hardware output pin for timing purposes Aft
22. put in RTCM format DGPS provides precision position fixes down to centimetres and is used in professional applications like agriculture The second UART UART_1 of the module is used to feed the data in DGPS is deactivated by default For configuration of the UART port some NMEA commands must be implemented See GPS GLONASS_NMEAcommandiInterface document for details 9 GNS GmbH 2013 V 1 1 Apr 11 2013 OBAL NAVIGATION SYSTEMS GNS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification Note Since SBAS and DGPS both do different corrections on the fix position solution they cannot be used at the same time SBAS DGPS usage is programmed through the NMEA Interface 3 12 Single sentence output GNS701 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 All relevant information will be provided in a single sentence output To save further channel load the sentence can be formatted as binary Need of firmware customization 3 13 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 14 Geofencing function GNS701 has an internal algo
23. rithm 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 15 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 16 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 17 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 is permanently stored inside GNS701 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 18 Real time clock RTC GNS701 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 st
24. t 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 1 Apr 11 2013 LOBAL NAVIGATION SYSTEMS GNS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification 4 TYPICAL APPLICATION BLOCK DIAGRAM 4 1 Typical System Overview a Mobile device e Se Power Management 3 gt GNS701 Host Processor MMI _ i Se d Backup 12 GNS GmbH 2013 V 1 1 Apr 11 2013 K ONS OBAL NAVIGATION SYS GPS GLONASS receiver GNS 701 Datasheet V1 1 5G preliminary specification S GLONASS characteristics 5 1 GPS GLONASS characteristics Parameter Min Typ Max Unit Note eral Frequency 1575 42 MHz GPS L1 MHz GLONASS Li Datum WGS84 AGPS 7 14 days Configurable Output data frequency 1 10 1 10 1 sec Navigation amp tracking sensitivity 165
25. t level of navigation sensitivity up to 165dBm It has superior dynamic performance 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 1 note Based on chip specifications GNS GmbH 2013 V 1 1 Apr 11 2013 GNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 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 18x18x4mm ceramic 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
26. ted noise from neighbour components may also reduce the performance of the receiver Please refer to GNS701 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 Value Unit Supply voltage range Vcc 3 0 to 4 3 V Backup voltage VBACKUP 2 to 4 3 V 7 2 Recommended Operating Conditions Parameter Min Typ Max Unit Note Vec 3 0 3 3 4 3 V supply voltage Ma ripple voltage 50 mVpp Backup voltage for RTC and memory retention must be VBACKUP 2 0 3 0 va Li available during normal operation RXO TTL H Level 2 0 Vec V Condition VCC 3 0V 4 3V RXO TTL L Level 0 0 8 V Condition VCC 3 0V 4 3V TXO TTL H Level 2 4 2 8 V Condition VCC 3 0V 4 3V TXO TTL L Level 0 0 4 V Condition VCC 3 0V 4 3V Storage temperature 50 90 C Operating temperature 40 85 SC GNS GmbH 2013 V 1 1 Apr 11 2013 14 Gi SNS OBAL NAVIGATION SYSTEMS GPS GLONASS receiver GNS 701 Datasheet V1 1 VEC GND VBACKUP TXO RXO ENABLE preliminary specification 8 PIN CONFIGURATION Top View ug ee NRESET RAI TXI 3D FIX IPPS Name 1 0 Description amp Note VCC Main DC power input The main DC power supply for the module The voltage should be kept between from 3 2V to 5 0V The ripple must be limite
27. to the GPS GLONASS_NMEAcommandiInterface manual for details Internal Logger Function Logger data rate 1 15 1 Lis Logger data memory 128 kBytes Flash memory Logger trigger programm Logger can be triggered on 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 GNS701 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 w
28. y and time measurements without any host loading This coupled with the optional built in power management options reduces the overall system power budget Selectable 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 lt CR gt lt LF gt Leaving standby mode and resuming to normal operation will be managed by sending any byte to the module Standby Mode Software on HOST side sends any byte to wake up from standby mode GPS on GPS off GNS GmbH 2013 V 1 1 Apr 11 2013 GNS GLOBAL NAVIGATION SYSTEMS GPS GLONASS receiver Datasheet V1 1 GNS 701 preliminary specification Backup mode can be entered by sending NMEA command PMTK225 4 2F lt CR gt lt LF gt The GPS core will shut down autonomously to backup state Vcc supply can now be switched off by an external power supply switch 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 Prracking ton ton toff Periodic mode is controlled with NMEA command PTMK225 See document GPS GLONASS
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