Studies and Performance of a New Technique for Mitigation of Pseudorange Multipath Effects in GPS Ground Stations

Gregory J. Bishop, David S. Coca, Peter H. Kappler, Elizabeth A. Holland

Abstract:	In many applications multipath can be the dominant error source for the measurement of the GPS pseudorange observable. This multipath error can seriously degrade the accuracy of any application that relies on accurate measurements of the pseudorange observable, including navigation, positioning, and ionospheric monitoring. This study focuses on the implementation and analysis of a software multipath modeling approach called the “multipath template” technique. This technique takes advantage of the daily repetition of the GPS observation geometry from a fixed ground station to create a template of the multipath error signature specific to each satellite pass. This multipath template can be applied to successive days of data to reduce the pseudorange multipath errors. This technique has the potential to reduce multipath errors in both geodetic and ionospheric applications. Several important aspects of the multipath template technique have been investigated. These include a study of the effective lifetime of a given template and an analysis of the effects of orbital stability on implementation of the technique. The spatial decorrelation of the multipath template has been also analyzed. In addition, an algorithm for quantifying the effectiveness of the multipath template technique in near real time has been developed. Finally, an investigation has been performed on the multipath errors remaining after applying the multipath template.
Published in:	Proceedings of the 1994 National Technical Meeting of The Institute of Navigation January 24 - 26, 1994 Catamaran Resort Hotel San Diego, CA
Pages:	231 - 242
Cite this article:	Bishop, Gregory J., Coca, David S., Kappler, Peter H., Holland, Elizabeth A., "Studies and Performance of a New Technique for Mitigation of Pseudorange Multipath Effects in GPS Ground Stations," Proceedings of the 1994 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1994, pp. 231-242.
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