Abstract
Due to the higher power and faster geometric changes, the enhanced GNSS based on LEO satellites has received more and more attention while it has brought the new interference problem. Binary offset chirp carrier (BOCC) modulation has been proposed for better reception performance and anti-jamming ability. The paper has focused on the BOCC modulation and time-frequency characteristics, and presented a double estimation method based on chirp delay locked loops (CDLL) for reception. By analysis of the tracking method, there is no another zero-crossing point in the CDLL, and the phase of the coherent integral is not affected by the delay, which is the key of unambiguous tracking. The simulation shows that the double estimation method can stably track BOCC signal, and the tracking performance is similar with BOC signal. It is worth noting that the tracking performance of BOCC signal with narrowband and correlation interference is better than the corresponding BOC signal. Assuming that the sampling rate is 10 MHz, the power ratio of jamming to signal is 20 dB, the code and carrier tracking performances of BOCC signal are increased by 20% and 29% comparing with BOC signal, respectively. Therefore, the tracking advantages under the jamming can be proved for BOCC modulations, and BOCC modulations provide a new choice for future navigation-augmented signal design and application.
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This work is supported by National Science Foundation of China (U20A0193, 62003354).
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Zhao, X., Huang, X., Tang, X., Sun, G. (2021). Double Estimation Tracking Method Based on Chirp Delay Locked Loops for BOCC Modulations. In: Yang, C., Xie, J. (eds) China Satellite Navigation Conference (CSNC 2021) Proceedings. Lecture Notes in Electrical Engineering, vol 774. Springer, Singapore. https://doi.org/10.1007/978-981-16-3146-7_27
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DOI: https://doi.org/10.1007/978-981-16-3146-7_27
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