On the Determination of C/A Code Self-Interference with Application to RFC Analysis and Pseudolite Systems

Cillian O’Driscoll, Joaquim Fortuny-Guasch

Abstract:	A GNSS receiver operates by acquiring and tracking signals from multiple satellites in view. In general, multiple signals, possibly from multiple systems, occupy the same bandwidth and, hence, interfere with one another. The Spectral Separation Coecient (SSC) is a metric that is commonly used to assess such interference. The SSC is computed between a pair of signals, the victim (or desired signal) and the interferer, and can be thought of as a measure of the average fraction of the interfering signal’s power which passes through the victim signal correlator. Typically, a single SSC value is computed for each pair of signal types. However, it has long been known that for some signals the SSC is strongly dependent on the (Doppler) frequency dierence between each pair of signals. The self-SSC of the GPS C/A signals exhibits particularly strong frequency dependency. In recent years a number of simulation based approaches have been proposed to determine a suitable single SSC value to be used in this case that accounts for this frequency dependency. In this paper, a novel, computationally e- cient technique called SSC Factorisation is proposed to this end. This technique is then applied to the fields of radio frequency compatibility studies and pseudolite systems. The proposed technique can be readily extended to signals other than the GPS C/A code.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	3620 - 3631
Cite this article:	O’Driscoll, Cillian, Fortuny-Guasch, Joaquim, "On the Determination of C/A Code Self-Interference with Application to RFC Analysis and Pseudolite Systems," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 3620-3631.
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