Product features

  • SiRF Star III Low Power Consumption Chipset.
  • Integrated ARM7TDMI CPU.
  • Cold Start: within 50 seconds.
  • 20 parallel satellite-tracking channels for fast acquisition and reacquisition.
  • A rechargeable battery sustains internal clock and memory. The battery is recharged during normal operation.
  • Support NMEA 0183 V2.2 command.
  • Differential capability utilizes real-time RTCM corrections producing 1-5 meter position accuracy.
  • User initialization is not required.
  • Dual communication channels and user selectable baud rates allow maximum interface capability and flexibility.
  • Optional communication levels, RS-232 and TTL meet ordinary application and new fashions of connecting PDA with TTL or RS-232 output.
  • Built-in WAAS Demodulator.
  • Water proof design.
  • LED display status: The LED provides users visible positioning status.
  • LED ˇ§BLINKINGˇ¨ when power connected and ˇ§ONˇ¨ when GGM309U got positioned.
  • FLASH base program memory.

Specification

  • Key Feature
    • Frequency: L1, 1575.42 MHz
    • C/A Code : 1.023 MHz chip rate
    • Channels : 20
    • Sensitivity Acquisition: -144~ -149 dBm Tracking: -155~ -160dBm
  • Non DGPS (Differential GPS)
    • Position Horizontal 5 to 25 meter CEP, without SA
    • Velocity 0.1 meter/second, without SA
    • Time 1 microsecond synchronized GPS time
  • DGPS (Differential GPS)
    • Position Horizontal 1 to 5 meter, typical
    • Velocity 0.05 meter/second, typical
    • EGNOS/WAAS < 2.2 m, horizontal 95% of time
    • Datum WGS-84
  • Performance
    • Hot start 2 sec., average
    • Warm start 38 sec., average
    • Cold start 50 sec., average
    • Reacquisition 0.1 sec. average
    • GPS Protocol Default: NMEA 0183 V2.2 (Secondary: SiRF binary)