Appendices
Test Bed Receiver Subsystem Addendum Rev 1 29
communications ports support user-selectable bit rates of 300 - 115,200 bps, w ith 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 inf ormation to you in the form of pre-
defined logs in a number of formats. In addition, when a MiLLennium-G LONASS GPSCard is linked to a NovAtel
GPSCard receiver or second MiLLennium-GLONASS GPSCard for differential positioning, they can communicate
directly through their serial ports.