Abstract
The Neumann-Hoffman code is modulated in Beidou D1 navigation message, which increases the possibility of bit sign transition. It puts a constraint on the coherent integration duration for possible bit sign transition. An acquisition scheme of Beidou B1I signal has been proposed in this paper. Firstly, the carrier and sign bit code are deprived by delay and multiplication. Then, the Doppler shift of the ranging code is searched. According to the Doppler shift of ranging code, the variable length of data block is accumulated to 1 ms data. Finally, the ranging code phase is detected by FFT-based synchronized algorithm. The carrier frequency offset, whose boundary is determined by the Doppler shift of ranging code, is accurately estimated by means of chirp-z transform. The experiment shows that the method can achieve long-term coherent integration and improve the acquisition probability.
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Acknowledgements
This work was supported in part by the National Natural Science Foundation of China under grant nos. 61571244 and 61501262, in part by Tian** Research Program of Application Foundation and Advanced Technology under grant no. 16YFZCSF00540.
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Yang, M., Wang, G., Zhao, Y., Wu, H. (2018). Beidou B1I Signal Acquisition Scheme Based on Variable Length Data Accumulation. In: Sun, J., Yang, C., Guo, S. (eds) China Satellite Navigation Conference (CSNC) 2018 Proceedings. CSNC 2018. Lecture Notes in Electrical Engineering, vol 498. Springer, Singapore. https://doi.org/10.1007/978-981-13-0014-1_10
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DOI: https://doi.org/10.1007/978-981-13-0014-1_10
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