Study of GPS Reflections and Multipath During Hubble Servicing Mission 4 (STS-125)

R. Shah, M.A. Walker, J. Voo, J.L. Garrison, P. Stout, K. Pekkarinen, D. LeJeune

Abstract:	This paper presents a preliminary analysis of Global Positioning System (GPS) data that were collected by the Relative Navigation System (RNS) during the Hubble Space Telescope (HST) Servicing Mission-4 (HSM4). Analysis of these data show evidence that a reflected signal from HST was received at the RNS antenna in the Shuttle, over a distance of 120 meters. Three tests were done on the received signal to confirm this hypothesis: The Polarization of the signal, Line of Sight (LOS) Visibility, and the Geometric consistency of the correlation peak motion. Having shown, evidence of a reflected signal in the recorded signal, these data would be valuable for both evaluating the feasibility of satellite-to-satellite ranging using passive bistatic radar, as well as validating models for the multipath environment in space rendezvous, docking and proximity operations.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2743 - 2749
Cite this article:	Shah, R., Walker, M.A., Voo, J., Garrison, J.L., Stout, P., Pekkarinen, K., LeJeune, D., "Study of GPS Reflections and Multipath During Hubble Servicing Mission 4 (STS-125)," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2743-2749.
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