Evaluation of GPS/UTC Steering Performance

W.A. Feess, H. Holtz, A.L. Satin, C.H. Yinger

Abstract: The Global Positioning System (GPS) is required to maintain CPS time to UTC to an accuracy of one microsecond and broadcast to the user the offset between CPS and UTC to an accuracy of 100 nanoseconds (1 sigma). On June 2.5, 1990, an automatic steering algorithm was implemented to control GPS time to synchronize if with UTC. The description of the steering laws and predicted performance results were presented at the 1989 PTTI conference, while preliminary performance results were presented at the 1990 PTTI conference. The initial performance was not as predicted, resulting in an in-depth analysis of the observed performance and a more thorough sensitivity analysis. In addition, responses to anomalies were investigated. This paper will describe these analyses and results, and evaluate actual steering performance from June 1990 to November 1991. Although anomalies were observed during the initial phase of steering, recent experience h more in line with expectation.
Published in: Proceedings of the 23th Annual Precise Time and Time Interval Systems and Applications Meeting
December 3 - 5, 1991
Pasadena, California
Pages: 35 - 48
Cite this article: Feess, W.A., Holtz, H., Satin, A.L., Yinger, C.H., "Evaluation of GPS/UTC Steering Performance," Proceedings of the 23th Annual Precise Time and Time Interval Systems and Applications Meeting, Pasadena, California, December 1991, pp. 35-48.
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