An Ambiguity-Free Anti-Multipath Method Applied to boc(n,n) Signals

Abstract

The invention discloses an unambiguous anti-multipath receiving method for BOC (n, n) signals, comprising the following steps: a received satellite navigation signal is phase-rotated and split to obtain zi(t) and zq(t); a local replication signal X(t) is generated according to pseudo-code phase information, and X(t) is correlated with and added up to zi(t) and zq(t) respectively to obtain Ip and Qp; a reference waveform signal W(t) is generated according to the pseudo-code phase information, wherein the basic waveform signal of W(t) is composed of four basic rectangular waves, the amplitudes of the first three basic rectangular waves are 1 and the widths are delta1, an interval of which the width is delta2 exists between the first two basic rectangular waves, the width of the fourth basic rectangular wave is delta3, and the amplitude of the fourth basic rectangular wave is -delta1 / delta3; W(t) is correlated with and added up to zi(t) and zq(t) respectively to obtain Iw and Qw; S3, a pseudo-code phase discrimination function is obtained through a formula d(epsilon)=Ip(epsilon)*Iw(epsilon)+Qp(epsilon)*Qw(epsilon) according to Ip, Qp, Iw and Qw obtained in S2; and S4, the steps S2 to S3 are repeated to realize BOC (n, n) signal pseudo code tracking. By adopting the method of the invention, error locking points of the pseudo-code phase discrimination function can be eliminated effectively.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a non-ambiguity anti-multipath receiving method applied to BOC (n, n) signals of a satellite navigation receiver. Background technique [0002] Multipath is caused by the satellite direct signal entering the receiver antenna through the reflection of surrounding objects. Since it is difficult to eliminate by establishing mathematical models and differential methods, multipath has become one of the main error sources of current satellite navigation system positioning. Traditional BPSK signal receivers generally use code correlation reference waveform technology to eliminate multipath errors. The code-related reference waveform technology generates a series of reference waveforms locally to construct an ideal pseudo-code phase discrimination function. The traditional reference waveforms include W2 waveform, W3 waveform, W4 waveform, etc. The BOC modulation method in t...

AI Technical Summary

Problems solved by technology

The present invention adopts a new reference waveform, while eliminating the wrong lock point in the pseudo-code phase discrimination function and solving the problem of tracking ambiguity when the code-related reference waveform technology is applied to the BOC(n,n) signal, it further improves the Anti-multipath performance of the receiver

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