Mitigation of GPS Carrier Phase Multipath Effects in Real-Time Kinematic Applications

Donghyun Kim and Richard B. Langley

Abstract:	In some situations where short delay and low frequency multipath due to a moving platform itself and close-by reflectors is predominant, a parametric estimation approach based on functional models, which relate the multipath errors of the code and carrier tracking loops with multipath parameters, is useful in mitigating the effects of multipath in the code and carrier phase measurements. We have carried out a feasibility study to investigate potential problems in the parametric estimation approach for multipath in real-time and kinematic applications. Based on our understanding of the approach using a multiple antenna-receiver system, we have tried to extend earlier work with several modifications such as different types of antenna-receiver system configurations, careful consideration of the antenna/receiver gain pattern, and the use of dual-frequency antennas and receivers, and so on. We have found that parametric estimation for multipath is feasible in real-time and kinematic applications as long as the observability problem in the measurement sensitivity matrix of the multipath parameters is solved. Several concluding remarks and recommendations related to hardware and software system implementation are discussed from a practical point of view.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	2144 - 2152
Cite this article:	Kim, Donghyun, Langley, Richard B., "Mitigation of GPS Carrier Phase Multipath Effects in Real-Time Kinematic Applications," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 2144-2152.
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