GPS Multipath and Satellite Interference

Richard D. J. van Nee

Abstract: Multipath tracking errors on pseudo ranges and carrier phase measurements are analyzed for both coherent and noncoherent delay lock loops with arbitrary early-late spacings. The coherent delay lock loop is shown to have a major advantage; for a relatively high fading bandwidth it has a zero tracking error, while a noncoherent delay lock loop can have a bias error of up to tens of meters. Carrier phase measurements are proven to be free of biases. For a small fading bandwidth, both coherent and noncoherent loops yield the same maximum multipath errors. Further, the effect of satellite interference is explained. Measurements of tracking errors due to multipath and satellite interference are presented, showing pseudorange errors in the range of several meters up to more than 100 meters, while carrier phase errors are limited to several centimeters.
Published in: Proceedings of the 48th Annual Meeting of The Institute of Navigation (1992)
June 29 - 1, 1992
ANA Westin Hotel
Dayton, OH
Pages: 167 - 178
Cite this article: van Nee, Richard D. J., "GPS Multipath and Satellite Interference," Proceedings of the 48th Annual Meeting of The Institute of Navigation (1992), Dayton, OH, June 1992, pp. 167-178.
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