An Optimal Joint Processing Method for BDS B1I and B1C Signals

Chuhan Wang, Xiaowei Cui, Tianyi Ma, Mingquan Lu

Abstract:	Along with the rapid development of Global Navigation Satellite System (GNSS), satellite navigation signals are more diversified, complex and suitable for increasing market needs. Various techniques have been developed for processing multiple navigation signals to provide better performance in terms of accuracy, availability, and robustness. The paper focuses on signals with separate but adjacent center frequencies such as B1I and B1C signals in the BeiDou global system. The two signals may have different modulation scheme, power ratio and initial phase relation and be processed independently by user receivers, however, the propagation delays of two signals from a satellite are nearly identical as they are modulated on adjacent frequencies, share the same reference clock, and their propagation paths to the receiver are nearly the same, which leads to strong coherence. Joint processing of these signals can achieve optimal measurement performance due to the increased Gabor bandwidth and power. A universal framework named the asymmetric dual-band tracking (ASYM-DBT) is proposed in this paper. The proposed ASYM-DBT technique can make use of the strong coherence above, the increased Gabor bandwidth and power to reduce the thermal noise and obtain much more accurate ranging result compared with the traditional single-band algorithm.
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:	1534 - 1543
Cite this article:	Wang, Chuhan, Cui, Xiaowei, Ma, Tianyi, Lu, Mingquan, "An Optimal Joint Processing Method for BDS B1I and B1C 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. 1534-1543. https://doi.org/10.33012/2017.15373
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