Extended Theory of Spectral Separation Coefficient for GNSS Signal Interference

Tomoya Shibata and Hiroaki Maeda

Abstract:	In recent years, accurate model for the evaluation of the interference effect have been required for future multi GNSS constellation. The spectral separation coefficient (SSC) and the effective noise density have been used to calculate the interference effect between the GNSSs. Especially, analysis of C/A on C/A interference is the most important subject, because the short periodicity of the C/A code makes a line-spectrum which results in a greater interference compared to a long code sequence when the coherent integration time is longer than a single spreading code period. In this paper, we provide a simple model of the SSC which takes into account the linespectrum effects and the coherent integration time for C/A on C/A interference properly. We also provide a new definition called "effective SSC" which should be applied to the effective noise density. The difference between the traditional SSC and the effective SSC, theoretically as well as numerical examples for each SSC values for cases of non-periodic sequence and periodic sequence, are discussed. Furthermore, validation of the model is shown by an experiment based on a commercial software receiver processing RF signals transmitted from GPS L1 C/A simulators.
Published in:	Proceedings of the 2010 International Technical Meeting of The Institute of Navigation January 25 - 27, 2010 Catamaran Resort Hotel San Diego, CA
Pages:	930 - 940
Cite this article:	Shibata, Tomoya, Maeda, Hiroaki, "Extended Theory of Spectral Separation Coefficient for GNSS Signal Interference," Proceedings of the 2010 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2010, pp. 930-940.
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