The Effect of SA Technique of GPS Time and Frequency Dissemination

Liu Jiyu

Abstract:	Global Positioning System (GPS) can disseminate time and time interval with accuracies of around 10 nanosec- onds, and establish frequency control with accuracies of a few parts in lE-12. Unfortunately, since 1 July 1991 GPS operational satellites have been switched to the selective availability (SA) technique that makes unauthorized users can not acquire high accuracies of real-time positioning and timing. In or&r to mitigate the effect of SA technique on GPS time transfer and frequency control this paper discusses the following subjects: main influence of SA technique; judgement by surveying data gathered in China in 1990 to 1992 on SA technique; effective method for precise time transfer and frequency control.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	153 - 153
Cite this article:	Jiyu, Liu, "The Effect of SA Technique of GPS Time and Frequency Dissemination," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 153-153.
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