1, module description GS-91U7 GPS / GNSS module is a low-power ultra small form factor main chip GPS receiver module, which uses a new generation of U-blox chips, high sensitivity, with a full range of features to meet strict requirements of professional orientation. Use GPS service embedded in smart phones, tablet PCs, PND, DVR, portable equipment, measuring equipment, personnel location management, speed equipment, timing equipment, delivery of the vehicle tracking, taxi tracking, vehicle tracking company logistics vehicle tracking, vehicle fault detection, vehicle detection oil, automobile things, excavator positioning and so on. 2, the module application GPS in PDA, Pocket PC, and other portable equipment in the field of personal positioning and auto positioning trajectory tracking product area measurement and distance measurement mapping products to synchronize the UTC time and timing field track records and GPS data point calibration and other products 3, Advantages sided surface-mount, secondary SMT programs, faster application process manufacturing lead-free, RoHS compliant UART / TTL, USB2.0 optional output using high-precision TCXO KDS 0.5PPM rich data output rate: 9600bps ( Default) [Optional: 1200,2400,4800,19200,38400,57600,115200, 230400,460800,921600] can be set with the output statement: NMEA 0183 V3.0 (GGA, GSA, GSV, RMC, VTG, GLL ) Built-in RTC crystal adjustable support data refresh rate: 1Hz-10Hz satellite quality control: a rich set of satellite software quality control and prevent the elegant setting scenarios: from walking mode - Car Mode - Static Mode - portable mode - mode and airborne 2D & 3D positioning the user can freely set up to support the positioning PPS indicator: Before positioning lit or shut down; flashes after positioning support AssistNow Online and AssistNow Offline A-GPS services such as GPS, GALILEO, SBAS (WAAS, EGNOS, MSAS, GAGAN) Hybrid Engine 4, the module parameters table module performance chips ublox UBX-G7020-KT frequency L1, 1575.42MHz protocol NMEA 0183 v2.3 GALILEO L1 open service (with upgrade) Default: GGA, GSA, GSV, RMC Support: VTG, GLL, TXT ublox binary and NMEA Command available 1200,4800,9600,19200,38400,57600,112500 bps baud channel 56 Internal ROM 3Mbit of ROM and 2Mbit of RAM Tracking Sensitivity: -162dBm Capture: -160dBm cold start Mai average -148dBm cold start Warm start 29 seconds on average 28 seconds Hot Start Average 1 second precision HorizontalPosition: Autonomous <2.5maverage, SBAS <2.0m average Velocity: 0.1 m / s Timepulse signal: RMS 30 ns maximum height of 18,000 meters maximum speed of 515 m / s maximum acceleration ≦ 4G update frequency 1-10 Hz A-GPS AssistNow on-line and off-line interface I / O Pins 1 serial ports physical characteristics of the type 22 pin stamp holes Dimensions 15.0mm * 13.0 mm * 2.4mm Power supply 3.3VDC ± 5% Backup voltage 1.8 ~ 3.6VDC power 18 ~ 25mA Operating humidity range of 5% to 95% non-condensing Operating temperature -40 ℃ to 80 ℃ Storage temperature -40 ℃ to 80 ℃ 5, pin definitions Pin NO. Pin Name I / O Description Remark 1 Reserved N Not Connect 2 Reserved N Not Connect 3 TIMEPULSE I / O One pulse per second. 4 TXD1 O This is the main transmits channel for outputting navigation and measurement data to user's navigation software or user written software.Output TTL level, 0V ~ 2.85V. 5 RXD1 I This is the main receive channel for receiving software commands to the engine board from ublox demo software or from user written software. 6 GND I Ground. 7 Reserved N Not Connect 8 Reserved N Not Connect 9 Reserved N Not Connect 10 Reserved N Not Connect 11 Reserved N Not Connect 12 V_BCKP PWR Backup battery supply voltage 13 VCC PWR Main power supply to the engine board. 14 Reserved N Not Connect 15 Reserved N Not Connect 16 Reserved N Not Connect 17 GND . G Ground 18 Reserved N Not Connect 19 VCC_RF RF GPS signal input 20 GND G Ground 21 RF_IN RF GPS signal input 22 GND G Ground 6, the details can be found at the official website to see:.. http: //www.gzxintu.com