Navstar Global Positioning System (GPS) Clock Program: Present and Future

Douglas M. Tennant

Abstract:	The Global Positioning System (GPS), well into its developmental phase, provides the most salient example today of both Rubidium and Cesium Atomic Frequency Standards being applied in a space environment. Indeed, the whole success of the GPS program rides on the performance and reliability of space qualified atomic clocks. Program status is provided by this paper and plans for ensuring the long-term continuation of the program are presented as well. Performance of GPS clocks is presented in terms of on-orbit data as portrayed by GPS Master Control Station Kalmar Filter processing. The GPS Clock Reliability Program is reviewed in depth and future plans for the overall clock program are published.
Published in:	Proceedings of the 12th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1980 Goddard Space Flight Center Greenbelt, Maryland
Pages:	703 - 718
Cite this article:	Tennant, Douglas M., "Navstar Global Positioning System (GPS) Clock Program: Present and Future," Proceedings of the 12th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, December 1980, pp. 703-718.
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