Codelesss Processing of BOC(10,5) Signals

Cillian O'Driscoll, James T. Curran

Abstract:	Codeless tracking of encrypted GNSS signals has a long history, and has been traditionally applied to the processing of the GPS P-code signal in precision receivers. In recent years this approach has also been applied to the Galileo E1 Public Regulated Service (PRS), for the purpose of signal quality modelling. Unlike the P-code, many modernised signals, including the E1 PRS, have an extra layer of modulation, called the subcarrier, which serves to spread the signal spectrum to either side of the centre frequency. The first application of codeless processing to modernised signals effectively performed codeless tracking of the subcarrier. A recent paper by the present authors introduced a new technique that permits tracking both the code and the subcarrier using codeless techniques. This approach is called “codeless code tracking”. In this paper we provide some new results on the codeless code tracking approach, including an analysis of the signal power requirements and the impact of chipping rate on the required integration time for tracking. The results are demonstrated through the codeless processing of real GPS L1 M-code signals.
Published in:	Proceedings of the 30th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2017) September 25 - 29, 2017 Oregon Convention Center Portland, Oregon
Pages:	3508 - 3518
Cite this article:	O'Driscoll, Cillian, Curran, James T., "Codelesss Processing of BOC(10,5) Signals," Proceedings of the 30th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 3508-3518. https://doi.org/10.33012/2017.15384
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