A DGPS Signal Processor with Improved Blockage and Multipath Properties

James W. Sennott and David Senffner

Abstract:	An advanced GPS receiver of the coupled-channel type was previously reported having improved carrier phase tracking and signal attenuation characteristics. In this paper the technique has been extended to more difficult scenarios, those with combined multipath and severe attenuation. The new architecture is first applied to the vehicle end of the DGPS system. In detailed simulations the coupled structure is shown to provide reductions of carrier phase multipath and reduction of cycle slippage, beneficial in difficult land vehicular environments, in aircraft approach and landing, and in kinematic survey. Finally, the coupled tracking processor is applied at the DGPS reference station. In a novel approach to the DGPS reference station a multi- antenna configuration is employed. For each satellite the trackers are optimally integrated to estimate the desired satellite DGPS bias and monitor and reject signal anomalies. When subjected to multipath and blockage the new system provides enhanced bias estimation accuracy over the tmdi- tional single-antenna reference station, and over multi- antenna configurations with linear post-channel combining.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	923 - 928
Cite this article:	Sennott, James W., Senffner, David, "A DGPS Signal Processor with Improved Blockage and Multipath Properties," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 923-928.
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