Geodynamics Frequency and Phase

F.O. Vonbun, V.S. Reinhardt

Abstract:	The objective of this paper is to discuss NASA's geodynamics experiments in relation to precise time and time interval requirements. In particular we are focusing on two specific experiments, namely the Apollo-ATS-6 gravity anomaly experiment which took place during the 1975 US-USSR Apollo-Soyuz test project and a dedicated earth gravity field mission called GRAVSAT which is planned to take place during the 1986-88 time frame. In these experiments, the earth's gravity field and in particular its spatial variation is determined by measuring extremely small changes in the range rate between two spacecraft. The ATS-6-Apollo experiment, satellite to satellite range rate errors of about 300 m/s were realized. It will be shown that errors of this magnitude are to be expected from the known phase noise of the CS-standards used. For the GRAVSAT mission range rate tracking errors of about 1 um/s are needed.
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:	647 - 647
Cite this article:	Vonbun, F.O., Reinhardt, V.S., "Geodynamics Frequency and Phase," Proceedings of the 12th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, December 1980, pp. 647-647.
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