Geophysical signal denoising method

A geophysical and signal technology, applied in the field of geophysical exploration, can solve the problem of difficult to obtain data with high signal-to-noise ratio, and achieve good signal denoising effect and accurate detection results.

Inactive Publication Date: 2019-05-14
WUHAN ENG SCI & TECH RESINST
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Problems solved by technology

However, the existing various denoising methods cannot well meet the needs of engineering applications, and it is difficult to obtain data with high signal-to-noise ratio

Method used

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  • Geophysical signal denoising method
  • Geophysical signal denoising method
  • Geophysical signal denoising method

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0021] Such as figure 1 The shown geophysical signal denoising method comprises the following steps:

[0022] Step 1: For the original geophysical signal (seismic signal, bolt detection signal, foundation pile detection signal or radar signal, here we take the seismic signal as an example, such as figure 2 As shown, the abscissa is the time ms, and the ordinate is the sensor displacement cm / s 2 ) to perform stockwell transformation to obtain the time-frequency spectrum of the original geophysical signal (such as image 3 As shown, the S transform spectrum of a certain seismic acquisition signal, its abscissa represents the time ms, the ordinate represents the frequency hz, and the brightness represents the energy size of this point);

[0023] Step 2: Perform time-frequency filtering and threshold filtering on the time-frequency spectrum of t...

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Abstract

The invention discloses a geophysical signal denoising method. The method comprises the following steps of S1, carrying out stockwell transform on an original geophysical signal, thereby obtaining a time-frequency spectrum of the original geophysical signal; S2, carrying out time-frequency filtering and threshold filtering on the time-frequency spectrum of the original geophysical signal; S3, carrying out two-dimensional Fourier transform on the time-frequency spectrum of a preliminarily denoised signal, thereby obtaining a two-dimensional Fourier frequency spectrum of the preliminarily denoised signal; S4, carrying out Gaussian filtering on the two-dimensional Fourier frequency spectrum; S5, carrying out two-dimensional inverse Fourier transform on a Gaussian filtering result, thereby obtaining the time-frequency spectrum of a further denoised signal; and S6, carrying out inverse stockwell transform on the time-frequency spectrum of the further denoised signal, thereby obtaining a required denoised signal. According to the method, noises in the geophysical signal can be simply, conveniently and efficiently removed.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a method for denoising geophysical signals. Background technique [0002] In the field of engineering geophysical prospecting, the processing of engineering geophysical prospecting data is directly related to the quality of data interpretation. Among them, removing and suppressing interference waves and improving the signal-to-noise ratio are the key links in seismic data processing. In order to improve the signal-to-noise ratio, researchers have designed many methods to remove noise and improve the signal-to-noise ratio according to the various characteristic differences between the signal and the noise. These denoising methods generally transform the signal into different transform domains to separate the signal from the noise. Commonly used transform domains include f-k domain, f-x domain, τ-p domain and frequency domain. If the difference between the signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 刘玉金彦周超肖柏勋叶辉胡满
Owner WUHAN ENG SCI & TECH RESINST
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