Sliding window loop tracking method and device

Abstract

The invention provides a sliding window loop tracking method and a device. According to the technical scheme of the invention, firstly, based on locally generated sine and cosine copied carriers, stripping the carrier of a satellite signal to obtain a first branch signal and a second branch signal; secondly, stripping the pseudo codes of the first and second branch signals according to local pseudo codes and conducting the low-pass filtering and the coherent integration to obtain the coherent integral values of a front branch, an immediate branch and a rear branch; thirdly, accumulating multiple adjacent integral values of the immediate branch in the non-coherent manner and conducting the phase demodulation of a carrier loop to obtain the phase difference between a local carrier and an input carrier; fourthly, adopting the non-coherent lead-lag magnitude method, estimating the integral values of the front and rear branches to obtain the phase difference between a local pseudo code and an input pseudo code; fifthly, filtering the phase difference between the local pseudo code and the input pseudo code, and adjusting the frequency of the local pseudo code according to the filtering result; sixthly, filtering the phase difference between the local carrier and the input carrier within a long non-coherent accumulation period of time in the sliding window manner, and adjusting the frequency of the sine copied carrier and the frequency of the cosine copied carrier according to the filtering result.

Description

technical field [0001] The invention relates to the application field of satellite navigation, in particular to a sliding window loop tracking method and device based on a non-coherent accumulating phase detector, which can be used for satellite signal tracking in high dynamic and weak signal environments, and can improve the receiver's ability to navigate Tracking accuracy of satellite signals. Background technique [0002] With the development needs of national defense and military, the dynamic (speed) of advanced weapons and equipment such as missiles and fighter jets is getting higher and higher. Acceleration or even jerk, which will cause a large Doppler shift and its rate of change. In addition, with the development of the application field of satellite navigation and the improvement of modernization, the requirements for the tracking accuracy of the receiver are also getting higher and higher. This makes the traditional navigation receiver unable to effectively proc...

AI Technical Summary

Problems solved by technology

This makes traditional navigation receivers unable to effectively process satellite signals, so that positioning and navigation can no longer be performed, and it needs to be improved

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