GPS Differential Positioning Using Quality Controlled P-code Pseudoranges

Inseong Song

Abstract:	Selection of the observable in GPS differential positioning depends on the accuracy requirement. In all cases, the P-code pseudorange can be utilized without the irritating integer ambignity resolution and cycle slip occurrences. When positioning with pseudoranges, multipath and measurement noise are the most important factors limiting accuracy. To reduce multipath and measurement noise, the frequency-weighted linear combination of dual- frequency P-code pseudoranges is studied and tested. The test results have shown that the use of combined observables requires quality control since those reconstructed measurements are biased even if the multipath and measurement noise are reduced. A technique proposed in this paper is to relate the position error, the quality index and the RGDOP. The quality index is derived from till dual band P-code pseudorange and carrier phase measurements in post- processing as well as real-time. Given the quality index and RGDOP, the position error can be estimated in either real-time or post-processing. This paper highlights the analyses of the relation between the quality index, position error, and RGDOP.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	749 - 757
Cite this article:	Song, Inseong, "GPS Differential Positioning Using Quality Controlled P-code Pseudoranges," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 749-757.
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