Optimization method of beidou satellite navigation signal acquisition algorithm based on modulation code polarity compensation

CN117665867BActive Publication Date: 2026-07-07XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIDIAN UNIV
Filing Date
2023-12-18
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing technologies for acquiring BeiDou satellite navigation signals suffer from high computational and time complexity, especially under multiple modulation types, making it difficult to effectively eliminate the influence of symbol transitions and affecting acquisition accuracy.

Method used

The modulation code polarity compensation method is adopted. Matched filtering is performed by generating corresponding local resampled ranging code signals. Combined with the hierarchical traversal and cyclic shift compensation techniques of message code elements, the coherent accumulation time is widened, and the computational complexity and time are reduced.

Benefits of technology

Without affecting the acquisition accuracy, the computational complexity and time of the multi-cycle acquisition algorithm are significantly reduced, the efficiency of multi-cycle coherent accumulation is improved, and the applicable fields of the algorithm are expanded.

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Abstract

The application provides an optimization method of a Beidou satellite navigation signal acquisition algorithm based on modulation code polarity compensation, aiming at greatly reducing the operation complexity and operation time of the polarity compensation algorithm in the multi-period acquisition algorithm under multiple modulation types without affecting the acquisition accuracy. The application widens the coherent accumulation time and introduces a fast polarity compensation technology for the text information, uses the modulation code to perform coherent accumulation operation on the matching filter operation result, finds the coherent accumulation operation result with the maximum peak value, and extends the fast polarity compensation method to other Beidou satellite signals, compares the peak-to-peak ratio of the coherent accumulation operation result of each carrier frequency with a threshold value, and if the peak-to-peak ratio is greater than the threshold value, the corresponding carrier frequency is confirmed as the real carrier frequency of the intermediate frequency navigation satellite signal. The application expands the application field of the algorithm and improves the accumulation efficiency of the multi-period coherent accumulation.
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