Long Code Acquisition Method Based on Bayesian Estimation

A Bayesian estimation, long code technology, applied in the directions of instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve the problems of prolonging the search time, the length of the matched filter should not be too long, and the search range of the matched filter frequency is narrow. To achieve the effect of reducing resource consumption

Active Publication Date: 2019-10-22
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
  • Long Code Acquisition Method Based on Bayesian Estimation
  • Long Code Acquisition Method Based on Bayesian Estimation

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[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 groups 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 punct...

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Abstract

The invention discloses a long code capture method based on Bayesian estimation. It adopts a matched filter cascade phase rotation method to capture the correlation peak of a long code signal with certain carrier dynamics, and at the same time, taking into account the capture of weak signals, For several correlation peaks that appear, the method of verification is used to effectively eliminate false alarms. This method is characterized by fast capture time and is suitable for situations where resources are limited and there is a high requirement for capture time.

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