Real Time GPS Pseudorange Multipath Correction

Ronald Brown and Jim Ward

Abstract:	Multipath errors in GPS pseudorange measurements limit the accuracy achievable with differential GPS (DGPS) processing. It is well known that the carrier measurements can be used to remove the dynamic effects of motion and selective availability (SA) from the code measurements and provide an indication of multipath errors, however, robust techniques to estimate and correct the observed multipath error in real time have not been published. This paper describes the theory of a real time multipath estimation and correction algorithm using dual frequency GPS measurements. The successful application of such an algorithm would eliminate the need for expensive multipath rejection antennas and/or site multipath calibration procedures for DGPS reference stations. Test results using the new algorithm with static differential processing show the potential for significant multipath reduction in the DGPS corrections.
Published in:	Proceedings of the 1995 National Technical Meeting of The Institute of Navigation January 18 - 20, 1995 Disneyland Hotel Anaheim, CA
Pages:	215 - 220
Cite this article:	Brown, Ronald, Ward, Jim, "Real Time GPS Pseudorange Multipath Correction," Proceedings of the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 1995, pp. 215-220.
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