Differential Channels Combining Strategies for Composite GNSS Signals Acquisition

K. Sun

Abstract:	New composite GNSS signals are usually characterized by the presence of data and pilot channels and the adoption of tired codes structure. In this paper, the problem of acquiring composite GNSS signals of the next generation systems (such as Galileo, and GPS modernization) is addressed and efficient acquisition strategies have been proposed in order to effectively deal with the data and pilot channels combinations in order to make full use of the transmitted available signal power in both channels. Toward the objective of a high sensitivity (HS) - GNSS receiver development, in this paper, several possible joint data and pilot channels combining strategies suitable for the Galileo E1 Open Service (OS) signals are investigated and compared with respect to the conventional acquisition technique currently used inside GNSS receivers; moreover, these channels combining strategies are further updated with the differential detection technique in order to improve the robustness of the acquisition process of GNSS receivers particularly in weak signal environments. The statistical properties of these differential channels combining strategies are deeply analyzed and analytical expressions for the probabilities of false alarm and detection are derived. In order to consolidate the theoretical analyses, Monte Carlo simulations have been performed on the simulated Galileo E1 OS signals in order to prove the improved performance of the developed differential channels combining techniques in comparison to the state-of-theart single channel acquisition methodologies.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	1218 - 1231
Cite this article:	Sun, K., "Differential Channels Combining Strategies for Composite GNSS Signals Acquisition," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 1218-1231.
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