RNSS Signal Modeling for Interference Analysis

E. Wasle, P. Berglez, J. Seybold, B. Hofmann-Wellenhof

Abstract:	The power spectral densities of signals are used to estimate the tracking accuracy and in a further step the position accuracy of a satellite navigation receiver. The correlation of two spectra at zero lag thereby defines the spectral separation coefficient, which itself models the interference power in the tracking loops. This coefficient is used to describe an extended signal to noise power density ratio, which beside the signal power and thermal noise floor includes the signal power of the interferences in the denominator of the ratio. In addition, the signal to noise power density ratio is used to compute the tracking accuracy. In this way the correlation between the desired / tracked signal and any other signal drives the position accuracy. This paper describes how the power spectral densities of the radio navigation satellite systems can be either computed strictly or described in an analytical closed form, and highlights different errors affecting the spectra computation. First, the paper presents the analytical derivation of power spectral envelopes for signals and inter-modulation products, in particular but not exclusively of current and upcoming satellite navigation signals. Furthermore, the methodology is shown to compute, in a strict manner, fine-structured power spectra of a radio navigation satellite system signal given in the time-domain. The errors of this derivation, which will finally affect the interference analysis, will be highlighted and quantified. Measures for error mitigation will be discussed. Another objective is the analysis of the resampling operation either in linear- or logarithmic-domain within the interference analysis.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	55 - 65
Cite this article:	Wasle, E., Berglez, P., Seybold, J., Hofmann-Wellenhof, B., "RNSS Signal Modeling for Interference Analysis," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 55-65.
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