An Adaptive SNR-Based Carrier Phase Multipath Mitigation Technique

Christopher J. Comp and Penina Axelrad

Abstract:	This paper describes an improved technique that mit- igates specular multipath in GPS differential carrier phase measurements. It adaptively estimates the spec- tral parameters (frequency, amplitude, phase offset) of multipath in the associated SNR., and then constructs a profile of the multipath error in the carrier phase. A multipath correction is subsequently made by sub- tracting the profile from the actual phase measurement data. The technique is demonstrated on ground based ex- perimental data, as well as flight data from the atmo- spheric research satellite CRISTA-SPAS. Ground ex- periments were conducted on static platforms in severe multipath environments. Multipath was deliberately introduced by either strategic placement of reflectors or electronic injection. This allowed for some control over the strength and frequency of the multipath. The experimental methods are described in detail. Aver- aging the results from 43 ground and 18 flight data sets, the differential carrier phase multipath was re- duced by 47%. The complete results for both ground and flight tests are presented and are accompanied by discussions of individual cases.
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:	683 - 697
Cite this article:	Comp, Christopher J., Axelrad, Penina, "An Adaptive SNR-Based Carrier Phase Multipath Mitigation Technique," 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. 683-697.
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