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Multi-frequency current zero-crossing waveform signal processing method and device

A current zero-crossing and waveform signal technology, which is applied in the field of multi-frequency current zero-crossing waveform signal processing methods and devices, can solve the problems of energy dispersion, small signal amplitude, and failure to meet the observation accuracy, and achieve an easy-to-achieve effect

Active Publication Date: 2021-08-17
TANGSHAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to the fundamental wave, the square wave and the trapezoidal wave will also contain infinitely many odd harmonics, and the energy will be dispersed; the higher the harmonic order, the smaller the signal amplitude, which cannot meet the requirements of the observation accuracy on a level

Method used

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  • Multi-frequency current zero-crossing waveform signal processing method and device
  • Multi-frequency current zero-crossing waveform signal processing method and device
  • Multi-frequency current zero-crossing waveform signal processing method and device

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Embodiment 1

[0051] Such as figure 1 As shown, the embodiment of the present invention discloses a multi-frequency current zero-crossing waveform signal processing method, including the following steps:

[0052] S101: Perform DFT algorithm processing on the received N noise-containing excitation alternating magnetic field signals;

[0053] S102: Find the N frequencies corresponding to the N largest spectral lines in the spectrogram processed by the DFT algorithm, and compare whether the N frequencies are consistent with the preset frequency of the original excitation signal. If they are equal, proceed to the next step; if they are not equal, go to the next step Optimize a specific frequency range, and then perform DFT algorithm processing until the N frequencies are equal to the preset frequency of the original magnetic field excitation signal;

[0054] S103: Calculate N amplitude values ​​corresponding to the N frequencies according to the amplitude calculation formula of the optimized zer...

Embodiment 2

[0061] Such as figure 2 As shown, the embodiment of the present invention discloses a multi-frequency current zero-crossing waveform signal processing method, including the following steps:

[0062] S201: Detect the excitation alternating magnetic field signal of the adjacent well casing surrounding the drilling well through the magnetic field sensor;

[0063] S202: Perform DFT algorithm processing on the received noise-containing N excitation alternating magnetic field signals;

[0064] S203: Find the N frequencies corresponding to the N largest spectral lines in the spectrogram processed by the DFT algorithm, and compare whether the N frequencies are consistent with the preset frequency of the original excitation signal. If they are equal, proceed to the next step; Optimize a specific frequency range, and then perform DFT algorithm processing until the N frequencies are equal to the preset frequency of the original magnetic field excitation signal;

[0065] S204: Calculat...

Embodiment 3

[0069] Such as image 3 As shown, the embodiment of the present invention discloses a multi-frequency current zero-crossing waveform signal processing method, including the following steps:

[0070] S301: Using a magnetic field sensor to detect the excitation alternating magnetic field signal of the adjacent well casing around the well being drilled;

[0071] S302: Perform DFT algorithm processing on the received three excitation alternating magnetic field signals containing noise;

[0072] S303: Find the three frequencies corresponding to the three largest spectral lines in the spectrogram processed by the DFT algorithm, and compare whether these three frequencies are consistent with the preset frequency of the original excitation signal. If they are equal, proceed to the next step, and if they are not equal, refine Specific frequency range, and then DFT algorithm processing, until these three frequencies are equal to the preset frequency of the original magnetic field excit...

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Abstract

The invention discloses a multi-frequency current zero-crossing waveform signal processing method and device. The method comprises the following steps: carrying out DFT algorithm processing on received noisy N excitation alternating magnetic field signals; finding out N frequencies respectively corresponding to N maximum spectral lines in the spectrogram processed by the DFT algorithm, comparing whether the N frequencies are consistent with a preset frequency of an original excitation signal, if so, carrying out the next step, and if not, refining a specific frequency band interval, and then carrying out DFT algorithm processing; calculating N amplitude values respectively corresponding to the N frequencies according to an amplitude calculation formula of the optimized zero-crossing trapezoidal wave reconstruction signal; and respectively carrying out amplitude correction on the calculated N amplitude values to finally obtain an amplitude approximate to a real signal. The method is easy to implement, and energy is more concentrated on fundamental frequency compared with common rectangular waves and zero-crossing square waves.

Description

technical field [0001] The present invention relates to the technical field of signal processing methods and devices, in particular to a multi-frequency current zero-crossing waveform signal processing method and device. Background technique [0002] Complex wells are an emerging drilling technology, including rescue wells, cluster wells, multilateral wells, and dual-horizontal wells. Due to the existence of multiple boreholes, the positioning method between the ongoing drilling and adjacent wells is the key to ensure accurate positioning. One of the core technologies. The traditional positioning method between adjacent wells is mainly to scan the empirical trajectory information, and measure the distance and azimuth between wells corresponding to different well depths. However, the measurement error in the traditional technology increases with the increase of the measurement depth, which makes it impossible to provide timely and accurate distance and azimuth information be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38G01V3/26
CPCG01V3/38G01V3/26
Inventor 窦新宇王超丁爱华贾兆旻王吉锐
Owner TANGSHAN COLLEGE
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