Signal Processing for Multipath Eects Mitigation in GPS

Gadalla El-Sayed A., Meir Pachter, and Stewart L. DeVilbiss

Abstract:	This paper introduces a new estimator that can detect the exact number of multipath component in the GPS receiver. Furthermore, the multipath signal's param- eters are estimated so that multipath eects can be mitigated in the digital receiver. The new estima- tor is based on Maximum Likelihood Estimation ap- plied to multiple observations of the received signal. A linear signal model is employed and the estimator entails a recursive calculation of the multipath time delay. This method is applied to the code phase and the results of the estimation can be used to estimate the carrier phase. In low signal-to-noise ratio an im- provement is achieved by using Kalman ltering. An analysis of the treatment of noise in multipath us- ing Kalman ltering is presented and a performance analysis is done to validate the Kalman lter design.
Published in:	Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998) June 1 - 3, 1998 The Adams Mark Hotel Denver, CO
Pages:	223 - 232
Cite this article:	A., Gadalla El-Sayed, Pachter, Meir, DeVilbiss, Stewart L., "Signal Processing for Multipath Eects Mitigation in GPS," Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998), Denver, CO, June 1998, pp. 223-232.
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