Analysis of M Code Signal Interference with C/A Code Receivers

John W. Betz

Abstract:	Understanding the effect of high power M code signals on reception of C/A code signals has been an important part of the design process for the M code signal. While it is relatively straightforward to predict the effect of M code on signal-to-noise-plus-interference ratio observed by C/A code receivers, it is more complicated to predict how interference from M code signals affects their code tracking accuracy. This paper draws upon new theory to predict how interference from different candidate M code modulation designs degrades code tracking accuracy by C/A code receivers. The theory shows how different receiver front-end bandwidths and different early-late spacings in a receiver affect how the receiver responds to interference from high power M code signals. The results are compared with predictions of M code interference effects on the receiver’s output signal-to-noise-plus-interference ratio, showing distinctly different effects.
Published in:	Proceedings of the 2000 National Technical Meeting of The Institute of Navigation January 26 - 28, 2000 Pacific Hotel Disneyland Anaheim, CA
Pages:	1 - 8
Cite this article:	Betz, John W., "Analysis of M Code Signal Interference with C/A Code Receivers," Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2000, pp. 1-8.
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