Satellite navigation signal capturing method and device

A satellite navigation signal and capture device technology, applied in the field of satellite navigation signal capture methods and devices, can solve problems such as poor sensitivity, unfavorable weak signal capture, and affecting the development of satellite navigation technology, achieve high capture sensitivity, improve search range and search The effect of precision

Active Publication Date: 2020-09-04
QINGDAO AUTOMATIC RES INST
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Problems solved by technology

[0003] The current signal acquisition method has poor sensitivity, which is not conducive to the acquisition of weak signals, which seriously affects the development of satellite navigation technology

Method used

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  • Satellite navigation signal capturing method and device
  • Satellite navigation signal capturing method and device
  • Satellite navigation signal capturing method and device

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Embodiment 1

[0039] The satellite navigation signal acquisition method of this embodiment uses Bayesian compressed sensing technology to improve the partial matched filter FFT capture technology, effectively expanding the frequency offset search range and search accuracy of the partial matched filter FFT technology. This method randomly samples the large-dimensional correlation integration results, and then uses the Bayesian compressed sensing method to reconstruct the spectrum of the correlated signal. This reconstruction method establishes a posteriori density error for the reconstructed signal, which can be used as a The confidence level of the signal, according to which the reliability of the maximum peak value of the frequency can be determined. This technology combines the confidence level and the maximum peak value as the basis for judging whether the signal is successfully captured, thereby effectively reducing the false alarm rate of the compressive sensing capture technology. At t...

Embodiment 2

[0111] Based on the design of the satellite navigation signal acquisition method in Embodiment 1, this embodiment proposes a satellite navigation signal acquisition device, which mainly includes a radio frequency module, an orthogonal correlation module, a correlation integration module, a sampling module, a signal reconstruction module, and a judgment module. modules, etc., see Figure 7 shown.

[0112] The radio frequency module is used for converting the signal received by the antenna into a digital intermediate frequency signal X;

[0113] The quadrature correlation module is used to correlate the digital intermediate frequency signal X with the local complex carrier signal to generate a zero intermediate frequency complex signal S;

[0114] The correlation integration module is used to perform correlation operations on the zero-IF complex signal S and local codes of different initial phases to obtain a signal Y; and perform segmental integration on the signal Y to genera...

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Abstract

The invention discloses a satellite navigation signal capturing method and device; wherein the method comprises the steps: carrying out the correlation of a digital intermediate frequency signal X anda local complex carrier signal, and generating a zero intermediate frequency complex signal S; performing correlation operation on the zero intermediate frequency complex signal S and local codes ofdifferent initial phases to obtain a correlated signal Y; performing piecewise integration on the signal Y to generate an integrated signal Yr; randomly sampling the signal Yr to obtain a signal Ys; knowing the observation matrix phi s and the signal Ys, and generating a frequency signal theta by adopting a fast Bayesian compressed sensing reconstruction algorithm; when the frequency signal thetameets a preset threshold range, judging that signal capture succeeds; the frequency offset searching range and searching precision are improved, and the capturing sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a satellite navigation signal acquisition method and device. Background technique [0002] Signal acquisition is the first and most important step in the baseband signal processing of satellite navigation receivers. Its goal is to capture the satellite signal in view, giving the code phase and Doppler frequency used to initiate the tracking process. Acquisition accuracy directly determines the success of the tracking process. In addition, its resource consumption has a great impact on the first positioning time, power consumption, volume and cost of the receiver, and its sensitivity is an important performance index of a satellite navigation receiver. [0003] The current signal acquisition method has poor sensitivity, which is not conducive to the acquisition of weak signals, and seriously affects the development of satellite navigation technology. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30Y02D30/70
Inventor 颜舒琳陈晓智周胜洪董蔺杨明张玉国单雪梅魏培平刘燕刘哲许志强姜丽颖
Owner QINGDAO AUTOMATIC RES INST
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