BOC(x,y) Signal Acquisition Techniques and Performances

N. Martin, V. Leblond, G. Guillotel, V. Heiries

Abstract: The introduction of the BOC modulation (Binary Offset Carrier) in the future GNSS signals will open the field to enhanced navigation performances and spectrum compatibility : GALILEO signals plan proposes to use BOC modulation for Open Service (OS), Safety of Life Service (SOL) and even Public Regulated Service (PRS). On the other hand, GPS M-Code also plans to use BOC modulation. BOC modulation is then a key issue for However, using such a modulation means to cope with ambiguities created in the auto-correlation function. In particular, these ambiguities apparently make the signal acquisition process more complex: the point is first to find energy avoiding local zero in the auto-correlation function (energy search phase), then to transit to a tracking status on the main peak (transition phase) before being able to benefit from the full BOC performances effect. This paper presents one technique to achieve BOC acquisition: it describes the acquisition process principles and its performances. This technique has been implemented in a simulator based on a Simulink and Matlab software and evaluated under different conditions (according to (x,y) values, dynamic conditions, etc.). Of course, the Time To First Fix (TTFF), the robustness and the receiver complexity impact are evaluated. As a result, the feasibility of a quick, efficient, and simple acquisition process is demonstrated.
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: 188 - 198
Cite this article: Martin, N., Leblond, V., Guillotel, G., Heiries, V., "BOC(x,y) Signal Acquisition Techniques and Performances," 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. 188-198.
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