Anti-multipath method for receiving BOC navigation signal without ambiguity

Abstract

The invention discloses an anti-multipath method for receiving a BOC navigation signal without ambiguity. The anti-multipath method comprises the following steps: generating an advance subcarrier signal, an instant subcarrier signal and a lag subcarrier signal by a subcarrier tracking ring; generating an advance spreading code signal, an instant spreading code signal and a lag spreading code signal by a spreading code tracking ring; multiplying the advance spreading code signal and the lag spreading code signal with the instant subcarrier signal separately to generate an advance local multiplesignal and a lag local multiple signal of the spreading code tracking ring for tracking an input BOC receiving signal; multiplying the instant subcarrier signal generated by the spreading code tracking ring with an instant spreading code signal to generate a BOC (n, n) signal, and summing up the BOC (n, n) signal and the instant spreading code signal to generate a corrected local spreading code signal for being input to the subcarrier tracking ring; separately multiplying the advance subcarrier signal and the lag subcarrier signal with the corrected local spreading code signal through the subcarrier tracking ring to generate the advance local multiple signal and the lag local multiple signal of the subcarrier tracking ring for tracking the input BOC receiving signal. The anti-multipath method can achieve effective suppression on a multipath signal, and improves the multipath resistance.

Description

technical field [0001] The invention belongs to the technical field of BOC navigation signal processing, and relates to an anti-multipath method for receiving navigation signals without ambiguity. Background technique [0002] BOC modulation is a newly proposed signal modulation method. Because of its superior characteristics, it has become a main modulation method of navigation signals. The correlation function of the BOC modulation signal has multi-peaks, and it is very easy to mistakenly lock on the secondary peak by using the commonly used delay-locked loop to track directly, that is, tracking blur occurs. The unambiguous tracking techniques of BOC signal include peak hopping method, BPSK-like algorithm and subcarrier phase elimination method, ASPECT algorithm and double estimation technology. Because the double estimation technology can realize the full-precision unambiguous tracking of the BOC modulated signal, and is easy to implement, the unambiguous tracking techno...

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the invention is to solve the problem of how to improve the multipath suppression performance of the dual estimation technology while tracking the received BOC navigation signal for the above-mentioned problems existing in the current BOC received signal

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