GPS Signal Degradation Modeling

Changlin Ma, Gyu-In Jee, Glenn MacGougan, Gérard Lachapelle, S. Bloebaum, G. Cox, L. Garin and J. Shewfelt

Abstract:	This paper attempts to provide some insight into the fading properties of GPS signals. When a GPS signal gets to an antenna, it suffers from masking and blocking effects from surrounding objects. With respect to these effects, GPS signals can be divided into clear LOS signals, shadowed signals, and blocked signals. A statistic model, Urban Three-State Fade Model (UTSFM), is discussed in this paper. Experimental results show that this model can describe the fading distribution of GPS signals very well. After model fitting, the model parameters can indicate the composition of the incoming signals in terms of the relative magnitude of the three signal types.
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:	882 - 893
Cite this article:	Ma, Changlin, Jee, Gyu-In, MacGougan, Glenn, Lachapelle, Gérard, Bloebaum, S., Cox, G., Garin, L., Shewfelt, J., "GPS Signal Degradation Modeling," 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. 882-893.
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