Robust Unambiguous Tracking of High-Order BOC Signals: A Multi-Correlator Approach

J.A. Garcia-Molina, M. Navarro-Gallardo, G. Lopez-Risueño, M. Crisci

Peer Reviewed

Abstract:	The usage of BOC signals in GNSS is in general of interest due to the better code tracking accuracy provided with respect to the BPSK modulation, at the cost of side peaks appearing in the autocorrelation function, which makes the code tracking ambiguous. In the case of high-order BOC signals, the risk to lock onto one of the side peaks might be not negligible, in particular for low C/No conditions or in the presence of fading events. This paper presents a novel unambiguous tracking technique of high-order BOC signals, the Double Optimization Multi-correlator-based Estimator (DOME). The DOME is a robust alternative to other unambiguous BOC tracking techniques found in the literature, being able to operate in harsh propagation conditions typical of urban environments, while fully exploiting the BOC signal properties. The approach followed consists on the solution of two parallel and dependent optimization problems in which N samples of the correlation function are exploited, solving the ambiguity problem at the same time that the high-order BOC accuracy is preserved. The preliminary performance assessment of the DOME in both controlled and realistic propagation conditions is presented, demonstrating the robustness and accuracy of the approach proposed.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	2951 - 2956
Cite this article:	Garcia-Molina, J.A., Navarro-Gallardo, M., Lopez-Risueño, G., Crisci, M., "Robust Unambiguous Tracking of High-Order BOC Signals: A Multi-Correlator Approach," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 2951-2956.
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