A method and system for removing motion noise from non-full-time and half-time aeronautical transient electromagnetic data

A transient electromagnetic and semi-aerial technology, which is applied in radio wave measurement system, electric/magnetic exploration, sound wave reradiation, etc., can solve the problem that the coil motion noise cannot be effectively removed, and achieve good denoising effect and effective identification and remove the effect of

Active Publication Date: 2022-05-17
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the existing denoising methods cannot effectively remove the coil motion noise due to the non-full-time data acquired during the off-time

Method used

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  • A method and system for removing motion noise from non-full-time and half-time aeronautical transient electromagnetic data
  • A method and system for removing motion noise from non-full-time and half-time aeronautical transient electromagnetic data
  • A method and system for removing motion noise from non-full-time and half-time aeronautical transient electromagnetic data

Examples

Experimental program
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Embodiment 1

[0049] This embodiment provides a method for removing motion noise from non-full-time and half-time aeronautical transient electromagnetic data, such as figure 2 shown, including the following steps:

[0050] Step 1: Determine the sampling frequency, the number of sample points, the cycle of sample data and the number of sample points per cycle of the sample data of the secondary field in the time domain.

[0051]Step 2: Determine the real time corresponding to all sample points, and extend the observed secondary field sample data to the full duration. Firstly, each sample point of the response profile is divided according to the half cycle to which it belongs. Assuming that there are a total of a sample points and b half cycles, each half cycle has a / b sample points. The time intervals between each sample point are consistent, and there is a half-cycle time interval between every two adjacent half-cycles. Assuming that the time interval of a half cycle is the unit "1", mov...

Embodiment 2

[0094] The purpose of this embodiment is to provide a non-full-time and half-time aeronautical transient electromagnetic data motion noise removal system on the basis of the method described in Embodiment 1. The system includes:

[0095] The sampling data acquisition module is used to acquire the time domain secondary field sample data, and its sampling frequency and sample data period;

[0096] A sampling data processing module, configured to extend the multiple half-period sample data included in the secondary field sample data to a full duration;

[0097] The expected frequency acquisition module is used to initially fit the full-time motion noise baseline, and obtain the expected frequency through spectrum analysis;

[0098] The motion noise fitting module is used to obtain full-time time-domain motion noise based on the desired frequency by using inverse discrete Fourier transform inversion;

[0099] The motion noise removal module is used to remove the obtained motion n...

Embodiment 3

[0101] The purpose of this embodiment is to provide an electronic device.

[0102] An electronic device includes a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor implements the method described in Embodiment 1 when executing the program.

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Abstract

The present invention provides a method and system for removing motion noise of non-full-time and half-time aviation transient electromagnetic data. The multiple half-period sample data contained in the secondary field sample data are extended to the full time; the full-time motion noise baseline is initially fitted, and the expected frequency is obtained through spectrum analysis; according to the expected frequency, the discrete Fourier method is used to The full-time time-domain motion noise is obtained by inverse transformation and inversion; the obtained motion noise is removed from the secondary field sample data. The invention fits the motion noise based on the semi-aerial transient electromagnetic late data and removes it from the original data, can effectively identify and eliminate the motion noise in the data, and has a good denoising effect.

Description

technical field [0001] The invention relates to the technical field of semi-aerial transient electromagnetic exploration, in particular to a method and system for removing motion noise from non-full-time semi-aerial transient electromagnetic data. 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] Semi-airborne transient electromagnetic method (SATEM) is an emerging geophysical exploration method by arranging transmitting sources on the ground and receiving signals in the air. It adopts the working mode of ground launch and air reception, which combines the advantages of high-power transmission of ground transient electromagnetic method (TEM) and rapid air exploration of aerial transient electromagnetic method (AEM), and overcomes the traditional Ground survey means cannot be carried out effectively and airborne electromagnetic survey is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/165G01V3/38
CPCG01V3/165G01V3/38Y02A90/30
Inventor 杨洋李虎张衡王鑫杜晓峰周长宇孙怀凤
Owner SHANDONG UNIV
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