Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..239s&link_type=abstract
In ESA, Frequency and Time Forum p 239-242 (SEE N93-24978 09-70)
Physics
Drift Rate, Global Positioning System, Navigation, Satellite Navigation Systems, Satellite Networks, Synchronism, Time, Autonomous Spacecraft Clocks, Correction, Root-Mean-Square Errors, Simulation, Steering, Time Measurement
Scientific paper
The Global Positioning System (GPS) will consist of a mixed constellation of Block 2/2A ground navigated and Block 2R autonomously navigated (Autonav) satellites for many years starting in 1996. The GPS time references for these two types of subconstellations must be synchronized to within a few nanoseconds if user navigation accuracy is to be preserved. A technique for achieving Root Mean Square (RMS) phase and rate synchronization of 2.9 ns and 0.13 ns/hr, by steering the ground system to Autonav, is described and validated by simulation. Coincidental with synchronization steering, it is shown that Autonav ensemble time (for a subconstellation of as few as four satellites) can be maintained to within 20.7 ns of Universal Time Coordinated (UTC) using a drift rate steering control law.
Feess W. A.
Satin A. L.
Yinger C. H.
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