Calibration of Multipath Errors on GPS Pseudorange Measurements

Changdon Kee and Bradford Parkinson

Abstract:	As GPS navigation errors reaches as small as a centimeter multipath becomes a major error source which causes problem to solve cycle ambiguities. Although multipath on GPS pseudorange has been studied by many people, actual calibration and elimination of multipath errors on GPS pseudorange measurements was not successful unless a new architecture of GPS receiver hardware is considered. This paper is presenting how to calibrate the multipath errors on the pseudorange measurements without a change of receiver hardware, using the fact that multipath is dependent on environment geometry around GPS antenna. After we calibrated, fitted to spherical harmonics, and reduced the multipath errors for a static user. This multipath calibration will help not only static user but also kinematic survey and real-time DGPS users to solve cycle ambiguities faster and more reliably. It will also help reduce errors in ionospheric time delay measurements for dual-frequency users.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	353 - 362
Cite this article:	Kee, Changdon, Parkinson, Bradford, "Calibration of Multipath Errors on GPS Pseudorange Measurements," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 353-362.
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