Unambiguous receiving method applied to BOC(kn,n) signals

Abstract

The invention discloses an unambiguous receiving method applied to BOC(kn,n) signals. The method includes the following steps: S1, subjecting a received satellite navigation signal to phase rotation and branching to respectively obtain zi(t) and zq(t), generating a spreading code and a subcarrier according to pseudo code phase information, modulating the spreading code and the subcarrier to obtain X(t), and respectively relating and accumulating the X(t) to the zi(t) and zq(t) to obtain IP and QP; S2, generating a W2 gate wave signal W(t) according to the pseudo code phase information, respectively relating and accumulating the W(t) to the zi(t) and zq(t) to obtain IW and QW, generating bipolar reference waveform BRW(t) according to the pseudo code phase information, respectively relating and accumulating the BRW(t) to the zi(t) and zq(t) to obtain IBRW and QBRW; S3, acquiring a pseudo code phase discrimination function according to the IP, QP, IW, QW, IBRW and QBRW obtained in the step S2 through an equation d(epsilon)=IW(epsilon)IBRW(epsilon)+QW(epsilon)QBRW(epsilon); S4, cyclically performing the steps S2 and S3 to realize the tracking process of the BOC(kn,n) signal pseudo codes. By the method, excessive zero crossing points of the phase discrimination function can be eliminated effectively.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an unambiguous receiving method applied to BOC(kn,n) signals. Background technique [0002] The BOC(kn,n) signal in the satellite navigation system is generated by modulating a series of subcarriers on the traditional BPSK signal. It is separated from the BPSK signal in the frequency spectrum, which can improve the spectrum utilization and make the correlation peak sharper. , It is better than the BSPK signal at the same code rate in terms of tracking accuracy and anti-multipath performance. GPS modernization, Galileo system, and Beidou satellite navigation system have all adopted this signal system. The autocorrelation function of the BOC(kn,n) signal has side lobes, so that when the traditional pseudo-code tracking method applied to the BPSK signal is transplanted to the BOC(kn,n) signal, the phase detection function produces redundant zero-crossing points, resulti...

AI Technical Summary

Problems solved by technology

The autocorrelation function of the BOC(kn,n) signal has side lobes, so that when the traditional pseudo-code tracking method applied to the BPSK signal is transplanted to the BOC(kn,n) signal, the phase detection function produces redundant zero-crossing points, resulting in tracking When it is mistakenly locked to the side lobe, the positioning will be deviated, which will directly affect the positioning performance of the satellite navigation receiver.

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