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C94-M8P-2 Application Board (dGPS)

  • Pay special attention to ESD protection!
  • Rover and Base antennas must use ground planes. Doing otherwise will make convergence times long. The ground plane should have a minimum diameter of 10 cm. [1]
  • Both UHF radio and the NEO-M8P operate on 3.3V. The app board provides inputs for 5V USB or 3.7-20V which we don't use.
  • This device has a single UART port. By default, it accepts RTCM (correction messages), UBX, NMEA as input and gives UBX, NMEA as output.
  • Header J8 exposes UART RX_GNSS (9), TX_GNSS (10) and GND (3). VCC (3.3V) is not available directly.
  • Follow guide [1] to setup “Base”. You need U-Center and Windows for this.
  • UBX-CFG “TMODE3” sets the Minimum Observation Time and Required Position Accuracy. If BOTH conditions are met, survey-in ends!
    • MOT 900s
    • RPA 0.1m
  • Time for base station survey-in [10cm accuracy; minimum time: 900s]: 3600 s effective

Screenshot shows test with manual displacement. Base station was surveyed-in but turned off again for some time before this test.

  • orb/c94-m8p.1467796837.txt.gz
  • Last modified: 6 years ago
  • by raffael