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Appendices
Test Bed Receiver Subsystem Addendum – Rev 1 29
communications ports support user-selectable bit rates of 300 - 115,200 bps, with a default of 9600 bps. The digital
section does the following:
• converts the IF analog signals to a digital format
• tracks the C/A codes and carrier phases of the satellites in use
• performs channel and loop control
• performs position computation
• executes navigation software
• performs database management
• monitors self-test system status
• controls diagnostic LEDs: a red one which only lights up to indicate an error condition, and a green
one (the “heartbeat”) which blinks on and off at approximately 1 Hz to indicate normal operation.
• controls I/O functions
You configure the MiLLennium-GLONASS GPSCard using special commands (see Appendix D GLONASS Commands
and Logs on Page 34). In turn, the MiLLennium-GLONASS GPSCard presents information to you in the form of pre-
defined logs in a number of formats. In addition, when a MiLLennium-GLONASS GPSCard is linked to a NovAtel
GPSCard receiver or second MiLLennium-GLONASS GPSCard for differential positioning, they can communicate
directly through their serial ports.