Unambiguous reception method of tmboc signal with time-division multiplexed double-reference waveform

Abstract

The invention discloses a TMBOC signal non-fuzzy reception method for two time division multiplexing reference wave shapes. The method includes the following steps: S1, performing phase rotation and shunting on a received satellite navigation signal, obtaining Zi (t) and Zq (t), generating a local copy signal X (t) according to pseudo-code phase information, and associating the X (t) with the Zi (t) and the Zq (t) and accumulating the X (t),the Zi (t) and the Zq (t) to obtain Ip and Qp; S2, generating a reference wave shape signal W (t) according to the pseudo-code phase information, and associating the W (t) with the Zi (t) and the Zq (t) and accumulating the W (t),the Zi (t) and the Zq (t) to obtain Iw and Qw; S3, obtaining a pseudo-code phase demodulation function through the Ip, Qp, Iw and Qw that are obtained in the step S2 by means of a formula (d=IpIw+QpQw); and S4, performing the step S2 to the step S3 in a cyclic manner to achieve TMBOC signal tracking. According to the method, wrong lock points of the pseudo-code phase demodulation function are eliminated, a BOC (6, 1) component is utilized, and the tracking precision is improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a pseudocode tracking method for a satellite navigation receiver receiving GPS system TMBOC signals. Background technique [0002] The GPS system broadcasts the TMBOC signal at the L1C frequency point, which is generated by the time division multiplexing of the BOC(1,1) and BOC(6,1) signals, and is separated from the BPSK signal in the spectrum, which can improve the spectrum utilization. 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. When traditional BPSK signals are received, code-related reference waveform technology is generally used to eliminate multipath errors. The code correlation r...

AI Technical Summary

Problems solved by technology

Due to the existence of sidelobes in the autocorrelation function of the TMBOC signal, when the code-related reference waveform technology is transplanted to the TMBOC signal, the pseudo-code phase discrimination function has a wrong lock point, and the pseudo-code may be mistakenly locked to the wrong lock point when tracking the pseudo-code. There is a large deviation in positioning, which directly affects the positioning performance of the satellite navigation receiver

In addition, when the code-related reference waveform technology is applied to the TMBOC signal, the BOC (6,1) component in the signal is not fully utilized, and the tracking performance is reduced

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