2 SOPS Anomaly Resolution on an Aging Constellation

Michael H. Rivers

Abstract:	The Navigation Tactics and Payload Analysis section within 2 SOPS is responsible for maintaining GPS's navigation signal integrity. This responsibility includes satellite maintenance, satellite performance monitoring and twenty-four-hour on-call duties. Over the last two years, GPS has experienced several anomalies that were the result of an aging constellation. These anomalies included: glint firings on SVN 15 and 18, clock heating caused by yaw saturation on SVN 29, Rubidium frequency standard end of life on SVN 19 and Cesium frequency standard end of life on SVN 16. Also, when SVN 14 and 16 had simultaneous anomalies, a large area over the continental US had less than four-satellite coverage. An understanding of what types of anomalies occur and how they were dealt with will be highlighted with an emphasis on how this could impact users. The author will also present descriptions of these anomalies and how they were resolved.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	2547 - 2550
Cite this article:	Rivers, Michael H., "2 SOPS Anomaly Resolution on an Aging Constellation," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 2547-2550.
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