Time and Frequency Transfer Combining GLONASS and GPS Data
BELGIAN ROYAL OBSERVATORY UCCLE
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Measurements from Global Navigation Satellite Systems GNSS have been used since the eighties to perform precise and accurate Time and Frequency Transfer TFT. Two main approaches are used presently the Common View or All in View based on the Common GPS GLONASS Time Transfer Standard CGGTTS and the Precise Point Positioning PPP. Concerning the CGGTTS approach, in order to allow the use of GLONASS data from geodetic-type receivers providing only raw data in RINEX format, the R2CGGTTS software developed initially for GPS at the Royal Observatory of Belgium ROB was updated. The GLONASS navigation files are used for the determination of satellite clocks and positions, and the computation procedure to get the CGGTTS data from the pseudorange measurements is applied similarly as for the GPS satellites.
- Test Facilities, Equipment and Methods
- Navigation and Guidance