High Integrity Multipath Mitigation Techniques for Ground Reference Stations

Donghai Dai, Todd Walter, C.J. Comp, Y.J. Tsai, P.Y. Ko, Per Enge and J. David Powell

Abstract:	There is an increasing demand for accuracy, integrity, continuity and availability in the ongoing develop-ment of differential GPS (DGPS) techniques. DGPS performance relies on the elimination of errors that are common to both users and ground reference sta-tions. A multitude of error sources affect DGPS mea-surements. Most of them can be effectively eliminated with dlfferencing techniques. Unfortunately, multi-path and receiver thermal noise cannot be canceled in this manner. Code phase noise is reduced very ef-fectively by carrier smoothing, however, this method is less effective against multipath. The bias-like mul-tipath remains the dominant error source for differ-ential GPS. This paper presents a spectral decomposition-based multipath mitigation technique, which combines car-rier smoothing, carrier Signal-to-Noise Ratio (SNR) and repeatability. Multipath stochastic modeling, SNR and repeatability aiding schemes are investi-gated in detail from an integrity viewpoint. Applica-tions in WAAS and LAAS reference station receivers are demonstrated through analysis and data from Na-tional Satellite Test Bed (NSTB) reference stations.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	593 - 604
Cite this article:	Dai, Donghai, Walter, Todd, Comp, C.J., Tsai, Y.J., Ko, P.Y., Enge, Per, Powell, J. David, "High Integrity Multipath Mitigation Techniques for Ground Reference Stations," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 593-604.
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