Research Article
Research on Unambiguous Acquisition of BOC Modulated Navigation Signal
@INPROCEEDINGS{10.1007/978-3-030-44751-9_4, author={Chunyang Liu and Hongwei Zhao and Li Li}, title={Research on Unambiguous Acquisition of BOC Modulated Navigation Signal}, proceedings={IoT as a Service. 5th EAI International Conference, IoTaaS 2019, Xi’an, China, November 16-17, 2019, Proceedings}, proceedings_a={IOTAAS}, year={2020}, month={6}, keywords={BeiDou-3 ASPeCT FFT Unambiguous acquisition}, doi={10.1007/978-3-030-44751-9_4} }- Chunyang Liu
Hongwei Zhao
Li Li
Year: 2020
Research on Unambiguous Acquisition of BOC Modulated Navigation Signal
IOTAAS
Springer
DOI: 10.1007/978-3-030-44751-9_4
Abstract
BOC (Binary-Offset-Carrier) modulation is widely used in the new generation of satellite navigation system. It has been used in GPS, Galileo and BeiDou systems. Compared with the traditional BPSK (Binary Phase Shift Keying) modulation, it has sharper correlation characteristics and stronger anti-multipath performance. The spectrum relocation caused by its splitting frequency can effectively solve the current frequency band congestion problem. But BOC modulation has multiple peak characteristics in the time domain, and the existence of sub-peak increases the difficulty of acquisition. Adding a pseudo-code correlation branch to the original BOC code correlation branch by using autocorrelation side-peak cancellation technique (ASPeCT) can effectively weaken the sub-peak of the correlation function and avoid wrong acquisition. This paper applies this ASPeCT acquisition algorithm to the parallel pseudo-random code FFT acquisition strategy to acquire the BeiDou-3 navigation signals. And the research object is the BOC (1,1) signal of the pilot component in BeiDou-3. Experimental results show that the method adopted in this paper can ensure the acquisition time and the acquisition accuracy reaches half a chip.
