A boc signal capture method based on ccrw

Abstract

This application relates to a method for capturing BOC signals based on CCRW. The method adopts a special local code waveform and combines the non-coherent dot product detection method to realize the detection of BOC s (m,n) signal and BOC c On the basis of the unambiguous capture of (m,n) signals, the Bump-Jump method is adopted, and two related branches, leading and lagging, are added to ensure that there is no error lock, and the unambiguous capture of the BOC signal is realized. After adopting the Bump-Jump method in this method, the probability of wrong lock of the BOC signal without fuzzy capture is lower than that of the traditional Bump-Jump method directly; this method can realize fuzzy capture with a small carrier-to-noise ratio attenuation, and its performance is better than that of the traditional method capture method.

Description

technical field [0001] The present application relates to the technical field of satellite navigation signal reception, in particular to a CCRW-based BOC signal acquisition method. Background technique [0002] Modern satellite navigation systems, including GPS, Galileo, and Beidou global satellite navigation systems, all use BOC signals in order to improve the utilization of navigation frequency bands and suppress signal multipath errors. Due to the use of subcarrier modulation, the correlation function of the BOC signal exhibits multi-peak characteristics. The traditional Doppler-code two-dimensional search capture is prone to miscapture and is not suitable for the capture of BOC signals. Therefore, the unambiguous capture technology has been extensively studied. . A variety of BOC signal ambiguity-free capture technologies represented by Bump-Jump method, BPSk-like method, single-sideband capture method, and side peak elimination method have been proposed at home and abr...

AI Technical Summary

Problems solved by technology

The Bump-Jump method and the BPSk-like method are two common BOC signal capture techniques. Both of them can solve the fuzzy capture of BOC signals, but both require additional auxiliary means. The former requires a pair of additional lead / lag tributaries to ensure that no false captures occur, which consume additional filter resources

Since the SSB capture method only uses half of the spectrum, the performance of the demodulated signal will be reduced, and the measurement accuracy cannot be improved.

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