Mathematical and Physical Modelling of Multipath Interference

Anthony R. Pratt

Abstract:	This paper sets up a physical model of multipath interference. A mathematical derivation using diffraction techniques is given by which multipath propagation can be described for the GPS scenario. Some physical situations approximate a simple version of this model and results are shown which are in broad agreement. More complex situations can also be dealt with but become computationally severe. Approximations can be made to these using a statistical technique called the Central Limit Theorem. It is shown that simple filtering of GPS pseudorange measurements does not remove contamination by multipath interference. Suggestions are made by which improvements in the accuracy of pseudorange corrections could be made for Differential Reference sites. Consideration is given to the possibility of using adaptive processing to identify and model the key parameters of the largest amplitude multipath interferers.
Published in:	Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991) September 11 - 13, 1991 Albuquerque, NM
Pages:	1013 - 1020
Cite this article:	Pratt, Anthony R., "Mathematical and Physical Modelling of Multipath Interference," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 1013-1020.
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