Modeling C/A on C/A Interference

Alessandro P. Cerruti, Joseph J. Rushanan, David W. Winters

Abstract:	A reasonable model for the effect of interfering GNSS signals from a single system is to replace the superposition of the interfering signals with a single nonrepeating white noise random signal. This is the so-called long-code approximation. This approach fails notably in the case of interference from several C/A signals on a desired C/A signal. In this paper, we provide a model for this C/A on C/A interference. This model quantifies the failure of the long-code approximation to explain the interference. The model uses a few important parameters, most notably Doppler differences. We not only show why C/A on C/A interference varies from the expected long-code approximation, but also how likely the interference will occur on average for any specific constellation. These predictions are validated by simulation.
Published in:	Proceedings of the 2009 International Technical Meeting of The Institute of Navigation January 26 - 28, 2009 Disney's Paradise Pier Hotel Anaheim, CA
Pages:	142 - 156
Cite this article:	Cerruti, Alessandro P., Rushanan, Joseph J., Winters, David W., "Modeling C/A on C/A Interference," Proceedings of the 2009 International Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2009, pp. 142-156.
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