Frequency Stability of GPS NAVSTAR Block I and Block II On-Orbit Clocks

Thomas B. McCaskill, Wilson G. Reid, James A. Buisson, Hugh E. Warren

Abstract:	Analysis of the frequency stability of on-orbit NAVSTAR clocks is performed by the Naval Research Laboratory.This work was sponsored by the GPS Joint Program Office. The frequency stability is presented for sample times of one day to 30 days. Composite frequency-stability profiles are presented for the Block I and Block II NAVSTAR clocks. Several NAVSTAR cesium clocks show frequency stabilities of a few parts in 1014 for long sample times. Time-domain noise-process analysis shows the dominant noise type to be white frequency noise for sample times of one to ten days. The non-stationary stochastic behavior of one of the cesium clocks, illustrated by its frequency-stability history, shows that the frequency stability is not always time-invariant.
Published in:	Proceedings of the 23th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1991 Pasadena, California
Pages:	307 - 319
Cite this article:	McCaskill, Thomas B., Reid, Wilson G., Buisson, James A., Warren, Hugh E., "Frequency Stability of GPS NAVSTAR Block I and Block II On-Orbit Clocks," Proceedings of the 23th Annual Precise Time and Time Interval Systems and Applications Meeting, Pasadena, California, December 1991, pp. 307-319.
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