Precise time recovery from transit satellites

Details Precise time recovery from transit satellites Precise time recovery from transit satellites

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rasc...14..715c&link_type=abstract

(International Union of Radio Science, Open Symposium on Time and Frequency, 1st, Helsinki, Finland, Aug. 1-4, 1978.) Radio Scie

Computer Science

Performance

Error Analysis, Instrument Errors, Satellite Transmission, Time Measurement, Time Signals, Transit Satellites, Bit Synchronization, Data Transmission, Navigation Satellites, Navy, Root-Mean-Square Errors, Spacecraft Communication

Scientific paper

An instrument using time signals from the Navy Navigation Satellite System (Transit) to derive precise time referenced to the U.S. Naval Observatory (USNO) master clock is described. The two sources of system time error, receiver detection error and spacecraft timekeeping error, are analyzed. Performance data from production equipment tested at USNO are given. A cooperative program between USNO and the control agency to improve the spacecraft timekeeping is outlined. Phase One of this program is underway, and projected results are analyzed. System accuracy is forecast to be 3-5 microsec rms when this program is completed.

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