A Practical Approach to the Reduction of Pseudorange Multipath Errors in a Ll GPS Receiver

Bryan Townsend and Patrick Fenton

Abstract:	The reduction of multipath biases on GPS measurements has traditionally been achieved through innovative antenna design. such as chokering ground planes, and care&l antenna site selection. These methods, although effective, are not always practical. especially in a kinematic environment. The implementation of narrow correlator spacing design in GPS receiver code tracking loops has greatly reduced the multipath bias and the measurement noise on C/A code pseudorange measurements. Even with these advancements the bias due to multipath is still dominant GPS position calculations. This paper introduces a new tracking loop which takes frill advantage of the narrow correlator spacing design but in addition is much more resistant to multipath effects on the correlation function and thereby reducing the multipath bias on the pseudorange measurements. The theory behind this new tracking loop design is presented along with its implementation into existing receiver hardware. Test results from a prototype receiver are presented. They show a 25 to 50 percent reduction of multipath error effects in the DGPS position solution as compared to a standard narrow correlator receiver.
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:	143 - 148
Cite this article:	Townsend, Bryan, Fenton, Patrick, "A Practical Approach to the Reduction of Pseudorange Multipath Errors in a Ll GPS Receiver," 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. 143-148.
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