Limitations of GPS Jamming Models in Providing Definitive Jamming Assessments

Jay Purvis

Abstract:	GPS jamming models which relate receiver J/S, jammer power, and distance jammed are widely used in both military and civilian jamming or interfaence assessments. This paper addresses relationships between model parameters and uncertainties in the parameters unique to GPS. Jamming assessments using the models can differ by an order of magnitude or more. An assessment indicating a jam distance of 10 km could easily become 100 km. The difference can be attributed solely to the relationships bet ween model parameters and their associated uncertainties. An understanding of the parameter relationships, their uncertainties, and the resulting impact on an analysis is crucial to the proper implementation and interpretation of GPS jamming or interference assessments.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	817 - 822
Cite this article:	Purvis, Jay, "Limitations of GPS Jamming Models in Providing Definitive Jamming Assessments," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 817-822.
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