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Method for capturing weak navigation signals by utilizing wavelet de-noising

A wavelet noise reduction and navigation signal technology, applied in the field of navigation satellite signal capture, can solve the problems of satellite signal attenuation, inability to meet requirements, inability to complete tracking and positioning solutions, etc., to improve accuracy, reduce noise, and improve signal-to-noise. the effect of

Inactive Publication Date: 2012-05-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the user is located in environments such as jungles, canyons, cities, indoors, and bunkers, the satellite signals will be severely attenuated, making the usual satellite signal acquisition methods unable to meet the needs, and it is impossible to complete tracking and positioning calculations

Method used

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  • Method for capturing weak navigation signals by utilizing wavelet de-noising
  • Method for capturing weak navigation signals by utilizing wavelet de-noising
  • Method for capturing weak navigation signals by utilizing wavelet de-noising

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings, and the description takes the acquisition of weak GPS signals as an example.

[0029] The GPS intermediate frequency analog signal can be expressed as follows:

[0030] S IF ( t ) = Σ i = 1 N 2 P i D i ( t - τ i D ) C i ( t - τ i ) expj ( ( 2 ...

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Abstract

The invention relates to a method for capturing weak navigation signals by utilizing wavelet de-noising. The components of the signals comprise ranging codes, and the method comprises the following steps: A, performing correlation integral of which the length is N milliseconds for each possibly existing satellite, and performing difference accumulation for M times on an obtained result; B, performing wavelet transform and de-noising treatment on a result obtained in step A; and C, performing inverse wavelet transform on a result obtained in step B to recover an original signal. The method utilizes the characteristic that the wavelet transform can separate the noise and signals onto different scales, completes the capture of the weak signals under strong noise background by treating the noise scale, and can effectively improve the detection signal-to-noise ratio compared with the prior method.

Description

technical field [0001] The invention relates to the field of navigation satellite signal capture, in particular to a method for capturing weak navigation signals by using wavelet noise reduction. Background technique [0002] In recent years, satellite navigation and positioning systems have been more and more widely used. Most of the communication methods of satellite navigation and positioning systems use direct sequence spread spectrum technology, and use code division multiple access to distinguish different satellites. When the user is located in environments such as jungles, canyons, cities, indoors, and bunkers, the satellite signals will be severely attenuated, making the usual satellite signal acquisition methods unable to meet the needs, and tracking and positioning calculations cannot be completed. In order to break the bottleneck in this application, the satellite navigation receiver is required to have a strong ability to capture weak signals, so as to achieve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G01S1/02G01S5/14
Inventor 秦红磊刘杨金天
Owner BEIHANG UNIV
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