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Long code acquisition method based on Bayesian estimation

A technology of Bayesian estimation and long code, which is applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of extended search time, narrow search range of matched filter frequency, and low sensitivity of long code capture, achieving The effect of reducing resource consumption

Active Publication Date: 2017-11-24
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0002] At present, the long code acquisition method of the mainstream satellite navigation receiver is mainly based on the matched filter method, but the frequency search range of the matched filter is limited. This method is limited by code Doppler, the length of matched filtering should not be too long, and the sensitivity of long code acquisition is low. The usual way is to increase non-coherent accumulation, which inevitably prolongs the search time required for acquisition

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  • Long code acquisition method based on Bayesian estimation

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] The long code acquisition method based on Bayesian estimation, sequentially completes digital down-conversion, matched filtering, phase rotation, threshold judgment, non-coherent accumulation and secondary threshold judgment, including the following steps:

[0029] (1) The digital intermediate frequency signal is down-converted according to the local recovery carrier, and the whole chip is accumulated to become two sets of signals: punctual accumulation signal S, delay accumulation signal S delay , the whole chip accumulation method is as follows figure 1 shown;

[0030] (2) Take (2×M-1)×N / 2 data respectively for the punctual accumulation signal and the delay accumulation signal obtained in step (1), and divide them into N 2M as a group according to the 50% data overlapping mode groups, and perform 2M N-point FFTs in parallel, and the FFT result of the punctua...

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Abstract

The invention discloses a long code acquisition method based on Bayesian estimation. A matched filter cascade phase rotation method is adopted, long code signals with certain carrier dynamics are subjected to correlation peak acquisition, acquisition of weak signals is considered at the same time, a verification mode is adopted to effectively eliminate false alarms for a plurality of appearing correlation peaks, and the method is quick in acquisition time, and is applicable to a condition with resource constraints and high acquisition time requirements.

Description

technical field [0001] The invention relates to a long code acquisition method of a satellite navigation receiver. The invention can be used to realize fast long code acquisition of weak satellite navigation signals. Background technique [0002] At present, the long code acquisition method of the mainstream satellite navigation receiver is mainly based on the matched filter method, but the frequency search range of the matched filter is limited. This method is limited by code Doppler, the length of matched filtering should not be too long, and the sensitivity of long code acquisition is low. The usual way is to increase non-coherent accumulation, which inevitably prolongs the search time required for acquisition. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a kind of long code acquisition method based on Bayesian estimation, realize the long code under the environment of ...

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Application Information

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IPC IPC(8): G01S19/30
Inventor 张丹杜辉
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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