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De-noising method of transient electromagnetic detecting echo signal

An echo signal and transient electromagnetic technology, which is applied in seismic signal processing, electrical components, transmission noise suppression, etc., can solve the problems that cannot eliminate echo signal noise, cannot accurately obtain deep geological features, and extract deep geological conditions. Signal and other problems, to achieve the effect of solving extraction problems and optimistic noise reduction performance

Inactive Publication Date: 2013-02-13
百色美联天衡地质探测雷达制造有限责任公司
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Problems solved by technology

[0005] For the deep echo signal, the noise is many times larger than the target signal. No matter how the integral stacking method increases the stacking times, the final signal is still dominated by noise, because the integral stacking method cannot eliminate the noise of the deep echo signal. Therefore, this method cannot be used to extract the target signal of deep geological conditions, and the deep geological characteristics cannot be accurately obtained

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  • De-noising method of transient electromagnetic detecting echo signal
  • De-noising method of transient electromagnetic detecting echo signal
  • De-noising method of transient electromagnetic detecting echo signal

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[0052] The overall flow of this embodiment of the transient electromagnetic detection and receiving signal noise reduction method is as follows figure 1 As shown, the steps are as follows:

[0053] I. Empirical Mode Decomposition (EMD) of Transient Electromagnetic Detection Received Signals

[0054] First obtain all the extreme points of the signal data x(t), and use the cubic spline interpolation function to form the upper envelope of the data for all the local maximum values. Similarly, use the cubic spline interpolation function to form the data for all the local minimum values The lower envelope of , the upper and lower envelopes should cover all data points, and its mean value is recorded as m 1 , subtract the mean from the original data sequence to get the first component h 1 :

[0055] h 1 =x(t)-m 1

[0056] The above process is called "sieving".

[0057] In the second "sieve" process, the h 1 As the data to be processed, the mean value of the envelope is m 11 ...

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Abstract

The invention provides a de-noising method of a transient electromagnetic detecting receiving signal, which comprises the following steps of: decomposing a transient electromagnetic detecting receiving signal by means of empirical mode, i.e. 'screening'; leading all extreme points of signal data x (t) to form into an upper envelope and a lower envelope through a cubic spline interpolation function; obtaining a mean value m1, wherein a first component h1=x (t)-m1, and the h1 is regarded as data to be processed to repeat the screening with k times; obtaining a first IMF when the standard deviation SD of the continues twice screening results meets the requirement, wherein c1=h1k=h1(k-1)-m1k and a residual signal r1; repeatedly 'screening' the r1; decomposing signal data to be n IMFs and one residual quantity rn; judging signal dominant and noise dominant component according to the diminishing condition of each IMF energy; and accumulating again after filtering each IMF of the signal dominant to obtain the de-noised signal. The method adopts empirical mode decomposition of adaptive time-frequency analysis, does not need priori information, respectively processes the different natural frequencies of the signal, removes high-frequency noise, filters high-frequency noise, is applied to removing the noise of the non-linear and non-stationary transient electromagnetic detecting echo signal, and is patricianly applied to removing the noise of a deep echo signal.

Description

(1) Technical field [0001] The invention relates to transient electromagnetic detection technology, in particular to a noise reduction method for transient electromagnetic detection echo signals based on empirical mode decomposition. (2) Background technology [0002] As we all know, the principle of transient electromagnetic detection is: the transient electromagnetic wave is attenuated by different media in each formation during the process of propagating underground, and different media have different attenuation values ​​for transient electromagnetic waves of different frequencies. Therefore, as long as the characteristic spectrum of the transient electromagnetic signal corresponding to different substances in the echo signal is extracted, the different substances in the formation can be inverted. However, the geological remote sensing signal is non-stationary and the background noise is complex. Using the conventional time-frequency joint analysis method will generate f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30H04B15/00
Inventor 欧阳缮邓鹏王国富张发全叶金才
Owner 百色美联天衡地质探测雷达制造有限责任公司
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