Urban Vehicular Multipath Detection Using Multiple Antennas and Reliability Analysis

R. A. Nayak

Abstract:	One of the most important issues when using GPS for urban vehicular navigation is the reliability of the position solution, which usually depends on the nature of the environment. In particular, the presence of urban canyons and foliage can cause significant degradation in satellite visibility as well as high multipath. The objective of this paper is to assess the impact of using multiple antennas along with some statistical reliability measure to detect blunders on pseudorange measurements, such that blunders can be rejected before they contaminate the estimated vehicle positions. One of the properties of multipath is that it decorrelates rapidly as a function of distance, so antennas spaced at least 0.5 m apart may be subjected to different multipath conditions making detection possible. The impact of using constraints between various antennas is also addressed. Land tests were conducted with four antenna/receivers in Calgary under various environments including open sky, urban canyon and dense foliage conditions. Results of the multipath blunder detection technique, when applied to the field data, are presented and discussed. An improvement of 10%-40% in position accuracy was achieved under different conditions.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	569 - 578
Cite this article:	Nayak, R. A., "Urban Vehicular Multipath Detection Using Multiple Antennas and Reliability Analysis," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 569-578.
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