The Merits of the Cyclostationarity of BOC Signals for a Cognitive GNSS Receiver Design

M. Sahmoudi, C. Yang, V. Calmettes

Abstract:	In this work, we propose to explore the cyclostationarity spectral characteristic of GNSS signals, in conjunction with cognitive radio (CR) technology to develop a new cognitive GNSS receiver, able to adapt the acquisition and tracking processing of GNSS signals according to the navigation environment. Binary Offset Carrier (BOC)modulation has been adopted to enhance satellite navigation performances and spectrum compatibility in the new generation of global navigation satellite systems (GNSS). The common processing of GNSS signals assumes the stationarity of BOC modulation and do not exploit their spectral redundancy. However, cyclostationarity of BOC modulation is an inherent characteristic shared by many other types of communication signals, which can be exploited to provide significant advantages in detection, parameter estimation and direction of arrival estimation. Motivated by the search of tools to exploit the spectral diversity and rich properties of these recent and sophisticated GNSS signals, our objective is to study the merits of the cyclostationarity of BOC signals for interference mitigation, multi-correlator design, extended coherent integration, and robustness to frequency variations. In this paper, we consider the cyclostationarity property related to the spectral lines introduced by the subcarrier component at the cycle frequency fs, which is also proportional to the code rate f0 = 1.023 MHz. Then, we apply the concept of cyclostationarity as an advanced processing technique for extended signal integration, robustness to Doppler frequency variation and to discriminate against smart interferences (i.e. variation of the type, number and power of jamers). We discuss the applicability of cyclostationarity to GNSS receivers and emphasize that is a challenging task but fortunately offers so many opportunities for improving the performance. Representative simulations are performed to illustrate the proposed cyclic correlations techniques with some applications to BOC(1,1), BOC (6,1) and BOC(10,5) signals.
Published in:	Proceedings of IEEE/ION PLANS 2010 May 4 - 6, 2010 Renaissance Esmeralda Resort & Spa Indian Wells, CA
Pages:	1181 - 1188
Cite this article:	Sahmoudi, M., Yang, C., Calmettes, V., "The Merits of the Cyclostationarity of BOC Signals for a Cognitive GNSS Receiver Design," Proceedings of IEEE/ION PLANS 2010, Indian Wells, CA, May 2010, pp. 1181-1188. https://doi.org/10.1109/PLANS.2010.5507238
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