Impact of Galileo Spreading Code Selection and Data Rate onto Navigation Signal Interference

F. Soualle, T.B. Burger

Abstract:	This paper intends to analysis the influence of the data rate and the spreading codes of the navigation signals onto intra-system interference for the GALILEO and GPS navigation systems. In a first approximation, it can be shown that the degradations caused by such interferences on the equivalent signal to noise ratio are proportional to the correlation between the power spectral densities of the tracked and the interfering signals, both spaced by their relative Doppler offset. The spectra of the navigation signals are consequently of prime importance for the intra-system performance evaluation. In this paper it is demonstrated that, under specific conditions onto symbol rate and code repetition period, the corresponding power spectral densities are well approximated by considering the simplified case of signals having the same characteristics but using non-periodical (random) codes. Such a simplification has the benefit of winning a non-negligible computation effort, which can be appreciable for the further development phases of the GALILEO signal structure definition. In this paper the example of the Galileo OS signals in the L1 band has been considered. Nevertheless the conclusions can be extended to similar navigation signals of the GALILEO system, also in the other frequency bands.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1035 - 1043
Cite this article:	Soualle, F., Burger, T.B., "Impact of Galileo Spreading Code Selection and Data Rate onto Navigation Signal Interference," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1035-1043.
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