Adaptive Detection of Code Delay and Multipath in a Simplified GPS Signal Model

Lisa M. Nelson, Penina Axelrad, Delores M. Etter

Abstract:	This paper introduces an application of adaptive filtering in a noise-canceling configuration that detects code delay and multipath in GPS using a simplified GPS signal model. An adaptive filtering process which allows a receiver to accommodate for changes in the environment surrounding the antenna is used. In this algorithm, filter weights from an LMS adaptive noise-canceling algorithm enable the receiver to determine the code delay from the direct satellite signal as well as the delay and attenuation of the multipath. A simplified signal model which includes idealized GPS C/A-code processing, multipath signals of varying delay and amplitude, interference of other C/A-codes, and quantization noise is used for the preliminary demonstration. Plans for application of this technique to a more realistic GPS signal model and assessment of the computational requirements are also discussed.
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:	569 - 581
Cite this article:	Nelson, Lisa M., Axelrad, Penina, Etter, Delores M., "Adaptive Detection of Code Delay and Multipath in a Simplified GPS Signal Model," 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. 569-581.
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