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The GR-87 design utilizes the latest surface mount technology (BGA) and high level circuit integration to achieve superior performance while minimizing space and power requirements. This hardware capability combined with software intelligence makes the board easy to be integrated and used in all kinds of navigation applications or products. The application system may communicate with the engine board set via two RS232 compatible bi-directional communication channels with CMOS/CMOS 3V voltage level.
Features: Build on high performance SiRF StarIII chipset.
Average Cold Start time and under 45 seconds. Low power consumption 20 channels "All-in-View" tracking. 200, 000+ effective correlators for fast TTFF and high sensitivity acquisitions. Integrated ARM7TDMI CPU with software engineering services and available for embedded customer defined applications. On chip 1Mb SRAM. Dual TTL level serial ports with one for GPS receiver command message interface, another one for RTCM-104 DGPS input. Compact Board Size 1"x1"x0. 27"(25. 4x25. 4x7mm) for easy integration into hand-held device. Reacquisition Time 0. 1 seconds Support Standard NMEA-0183 and SiRF Binary protocol Support Accurate 1PPS Output Signal Aligned with GPS Timing Multi-path Mitigation Hardware On-board RTCM SC-104 DGPS and WAAS /EGNOS Demodulator Built-in a lithium battery make GPS fast positioning
Dynamic Conditions: Altitude: 18,000 meters (60,000 feet) max Velocity: 515 meters/second (1000 knots) max Acceleration: 4g, max Jerk: 20 meters/second, max
Specification:
General 1. Frequency L1, 1575. 42 MHz. 2. C/A code 1.023 MHz chip rate. 3. Channels: 20.
TIMEMARK-1PPS Pulse 1. Level CMOS 3V 2. Pulse duration 1 microsecond. 3. Time reference At the pulse positive edge. 4. Measurements Aligned to GPS second, 1 microsecond.
Datum 1. Default WGS-84. 2. Other Support different datum by request.
Physical Characteristics 1. Active Size: 25. 4(W) x 25. 4(D) x 7(H) (mm) 2. Weight: 2 g 3. Interface connector 6-pin straight male header, 1. 25 mm pitch.
Environmental Characteristics 1. Operating temperature range(C): -10 to +60 2. Storage temperature range(C): -20 to +85
Power: 1. Input power 3.3V — 5. 5VDC 2. Input current: Less than 80 mA (without antenna) 3. Backup power: 3V Rechargeable Lithium cell battery, up to 500 hours Discharge.
Acquisition Rate (Open sky, stationary requirements) Reacquisition: 0.1 sec., average. Hot start: 1 sec., average. Warm start: 38 sec., average. Cold start: 42 sec., average.
Interface: Antenna connector type: MMCX, output 2. 8 VDC. (optional output VCC_IN). Minimum signal tracking: -159 dBm. Two full duplex serial communication, CMOS interface, with user selectable baud rate (4800-Default, 9600, 19200, 38400). NMEA 0183 Version 2. 2 ASCII output (GGA, GSA, GSV, RMC (VTG, GLL and ZDA for optional)). DGPS protocol RTCM SC-104 message types 1, 2 and 9. SiRF binary-position, velocity, altitude, status output.
GR-87 GPS module