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Method for detecting stochastic resonance transient electromagnetic weak signals

A weak signal detection and transient electromagnetic technology, applied in the direction of electromagnetic field characteristics, can solve the problems of weak signal detection, failure to keep up with the transition rate, difficult random resonance, etc., to achieve short data acquisition time, shortened acquisition time, and data acquisition The effect of volume reduction

Inactive Publication Date: 2010-09-08
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

However, the signal amplitude of the weak signal itself under the strong noise background is too small, and it is difficult to generate stochastic resonance; in addition, because the transition rate of Brownian particles between the double wells cannot keep up with the external driving force of large frequency, it is also the reason why stochastic resonance cannot be generated.
[0007] The target signal obtained by transient electromagnetic detection is a weak signal in a strong noise background, and it is not just a low-frequency signal. The existing stochastic resonance method that can effectively identify weak signals is powerless for the weak signal detection of transient electromagnetic detection

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  • Method for detecting stochastic resonance transient electromagnetic weak signals
  • Method for detecting stochastic resonance transient electromagnetic weak signals
  • Method for detecting stochastic resonance transient electromagnetic weak signals

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[0034] The embodiment of the stochastic resonance transient electromagnetic weak signal detection method is used in the geological field survey of a certain place, and the transient electromagnetic detection receiving signal is ns(t), ns(t)=s(t)+n(t), s (t) is the target signal, s(t)=∑A i cos(w i t) is a plurality of frequency signals, wherein: A i is the target signal amplitude, which has little influence on the system and is not considered, w i is the target signal frequency, w i The range is 1Hz~100000Hz. n(t) is Gaussian white noise with intensity D≈48.5. Since the received signal from transient electromagnetic detection is a noisy signal under a strong noise background, the energy of the target signal is very small compared to the noise, so the noise intensity is determined by the received content The strength of the noise signal is similar, and the strength of the noise-containing signal in this example is 48.5. The stochastic resonance system used is

[0035] ...

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Abstract

The invention relates to a method for detecting stochastic resonance transient electromagnetic weak signals. Transient electromagnetic detecting receiving signals are ns (t), wherein ns (t) is equal to s (t) plus n (t), and s (t) is target signals. In the method, scale variation is carried out on the signals, i.e. the frequency domain of time-domain signals ns (t) is NS (jw), and the frequency domain of ns (mt) is shown in the specification, wherein m is a nonzero constant. The time-domain signals are compressed by m times, and the frequency spectrum thereof in the frequency domain is expanded by m times. Thus, the frequency of large frequency weak target signals in the noise received by transient electromagnetic detection is reduced to be less than 0.1Hz, the weak target signals are input to a stochastic resonance system to generate resonance, then the target signals after time-domain compression are extracted, and then the frequency spectrum of the obtained target signals is reduced. The method of the invention comprises the following steps: firstly, inputting noise to the stochastic resonance system to obtain a noise average power spectrum strength Pn; then inputting the signals to the resonance system, wherein a frequency fi which meets the power spectrum strength in the power spectrum of output signals is the resonance frequency; and reducing each resonance frequency fi to obtain the actual frequency of the target signals. The method eliminates frequency restriction of the stochastic resonance system on transient electromagnetic signals to be detected, and accurately detects the weak target signals.

Description

(1) Technical field [0001] The invention relates to a transient electromagnetic detection technology, in particular to a scale transformation-based random resonance transient electromagnetic weak signal detection method. (2) Background technology [0002] The transient electromagnetic detection method has the advantages of fast detection ability and better spatial resolution, and has been widely used in mineral exploration and hydraulic environment exploration in recent years. [0003] 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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08
Inventor 欧阳缮张海如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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