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Method and system for reducing noise of tunnel wireless seismograph

A seismograph and noise technology, applied in seismic signal processing and other directions, can solve the problems of erroneous analysis results, not performed at the same time, erroneous results, etc., and achieve the effect of improving the signal-to-noise ratio of the instrument and ensuring the accuracy.

Active Publication Date: 2021-01-15
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the distributed seismograph acquisition system, due to the different terminal positions, the distance from the interference source, humidity and temperature changes are different, and the influence of noise is also different. Therefore, the inventors found that using the same noise source data as The benchmark cannot accurately reflect the actual interference situation of each signal collection point, which may lead to wrong analysis results
There are also some seismographs that first collect environmental noise for a period of time as the reference noise data source and then collect signals. However, the environmental noise changes randomly, that is, the acquisition of noise data and signal acquisition are not carried out at the same time. Unsatisfactory noise filtering can also lead to erroneous results

Method used

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  • Method and system for reducing noise of tunnel wireless seismograph
  • Method and system for reducing noise of tunnel wireless seismograph
  • Method and system for reducing noise of tunnel wireless seismograph

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Experimental program
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Embodiment 1

[0039] refer to figure 1 , a method for reducing the noise of a tunnel wireless seismograph in this embodiment, comprising:

[0040] Step 1: Synchronously receive noise data and vibration data, and perform power spectrum analysis on the noise data.

[0041] Among them, the noise data includes electromagnetic noise and intrinsic noise.

[0042] In a specific implementation, the noise data is collected by noise sampling equivalent resistance. Geophones may be employed to acquire vibration data.

[0043] It should be noted here that other existing equipment can also be used to collect noise data and vibration data.

[0044] Step 2: Calculate the pulse factor of the power spectrum, and compare the pulse factor with the preset pulse factor threshold to obtain the interference noise frequency point set and the non-interference noise frequency point set.

[0045] When the pulse factor is higher than or equal to the preset pulse factor threshold, the corresponding frequency point ...

Embodiment 2

[0051] This embodiment provides a system for reducing the noise of a tunnel wireless seismograph, including:

[0052] A data receiving and preprocessing module, which is used to receive noise data and vibration data synchronously, and perform power spectrum analysis on the noise data;

[0053] A frequency point set generation module, which is used to calculate the pulse factor of the power spectrum, and compares the pulse factor with the preset pulse factor threshold to obtain an interference noise frequency point set and a non-interference noise frequency point set;

[0054] Set judging module, it is used for judging whether the interference noise frequency point set is empty, if so, then need not carry out denoising processing to vibration data; If not empty, then carry out Fourier transform to vibration data;

[0055] Inverse Fourier transform module, which is used to set the Fourier transform value at any frequency point in the interference noise frequency point set to 0, ...

Embodiment 3

[0059] Such as figure 2 As shown, the present embodiment provides a tunnel wireless seismograph, which includes an industrial computer, an acquisition terminal and a wave detection device; a plurality of acquisition terminals are respectively arranged in different positions of the tunnel, and each acquisition terminal is connected to a wave detection device; the acquisition terminal is used To obtain noise data and vibration data at different locations in the tunnel;

[0060] An industrial computer configured to: receive noise data and vibration data synchronously, and perform power spectrum analysis on the noise data;

[0061] Calculate the pulse factor of the power spectrum, and compare the pulse factor with the preset pulse factor threshold to obtain the interference noise frequency point set and the non-interference noise frequency point set;

[0062] Judging whether the set of interference noise frequency points is empty, if so, the vibration data does not need to be de...

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Abstract

The invention belongs to the field of tunnel wireless seismographs, and provides a method and a system for reducing noise of a tunnel wireless seismograph. The method for reducing the noise of the tunnel wireless seismograph comprises the following steps: synchronously receiving noise data and vibration data, and carrying out power spectrum analysis on the noise data; calculating a pulse factor ofthe power spectrum, and comparing the pulse factor with a preset pulse factor threshold to obtain an interference noise frequency point set and a non-interference noise frequency point set; judging whether the interference noise frequency point set is empty or not, and if yes, not performing noise reduction processing on the vibration data; if not, performing Fourier transform on the vibration data; and setting the Fourier transform value at any frequency point in the interference noise frequency point set to be 0 to obtain Fourier transform corresponding to the denoised vibration data, and then performing inverse Fourier transform to obtain denoised vibration data.

Description

technical field [0001] The invention belongs to the field of tunnel wireless seismographs, in particular to a method and system for reducing the noise of tunnel wireless seismographs. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] During tunnel construction, tunnel excavation will generate a lot of electromagnetic noise. At the same time, other construction machinery, welding equipment, frequency converters, walkie-talkies, etc. will also generate a lot of random electromagnetic noise. When wireless seismographs are used for tunnel geological advance prediction, these noises will pollute the input signal and crosstalk into the instrument through signal cable conduction, space electromagnetic coupling, etc. cause difficulties, and thus affect the detection results. On the other hand, there are switching noises generated by functional cir...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 许新骥周鹏飞郭旭李铎刘丛林高雪池付超马川义曹帅
Owner SHANDONG UNIV