Novatel

Research Global Positioning System

GPS position and velocity reported at 10 samples per second from the Novatel BESTPOS and BESTVEL logs. The NMEA GPGGA and GPRMC logs are also recorded for redundancy. The UTC time is taken from the GPGGA log, since the BESTPOS and BESTVEL logs are stamped with GPS time which ignores leap seconds.

Differential GPS ground station

The ground system improves the aircraft positional accuracy by recording 1-sample-per-second raw gps pseudorange, carrier phase, and carrier doppler frequency data (RANGECMP log) at a fixed and known location for use in post-flight processing.

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