Transient electromagnetic signal power frequency and harmonic interference elimination method and apparatus thereof

A harmonic interference and transient electromagnetic technology, which is applied in the direction of measurement devices, electric/magnetic exploration, radio wave measurement systems, etc., can solve problems such as the decrease of measurement fidelity

Inactive Publication Date: 2016-05-04
JILIN UNIV
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  • Abstract
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Problems solved by technology

Although this method attenuates the power frequency interference, the useful signal is also attenuated, resulting in a decrease in measurement fidelity

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  • Transient electromagnetic signal power frequency and harmonic interference elimination method and apparatus thereof
  • Transient electromagnetic signal power frequency and harmonic interference elimination method and apparatus thereof
  • Transient electromagnetic signal power frequency and harmonic interference elimination method and apparatus thereof

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Embodiment Construction

[0055] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0056] The transient electromagnetic signal power frequency and its harmonic interference elimination device based on noise modeling provided by the embodiment of the present invention, the principle block diagram is as follows figure 1 As shown, this embodiment adopts the working method based on the center loop, such as image 3 As shown, the transmitting coil 11 is laid as a square loop with a side length of 100 m, and the receiving coil 1 is a square loop with a side length of 1 m.

[0057] The receiving coil 1 receives the environmental noise signal n(t)( figure 2 Middle T0 ~ T1 time period), the signal is amplified ...

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Abstract

The invention belongs to the electromagnetic signal processing and especially discloses a transient electromagnetic signal power frequency and harmonic interference elimination method and an apparatus thereof. The method comprises the following steps of in a first time period, receiving an environmental noise signal N(t), and after amplification, removing a high frequency noise through low-pass filtering; carrying out modeling on power frequency in the signal and a harmonic noise to obtain a power frequency and harmonic interference model; from a second time period, opening an emission machine, receiving a transient electromagnetic induction voltage signal and the environmental noise signal; using the power frequency and harmonic interference model in the first time period to calculate power frequency and harmonic estimation values in the second time period and subsequent time periods; and removing the power frequency and harmonic estimation values from the transient electromagnetic induction voltage signal and the environmental noise signal via a subtractor to acquire a de-noised transient electromagnetic signal. By using the method, the power frequency and harmonic interference with any frequency can be removed.

Description

technical field [0001] The invention belongs to electromagnetic signal processing, specifically a method and device for eliminating transient electromagnetic signal power frequency and its harmonic interference. Background technique [0002] Transient electromagnetic detection method is a geophysical detection method based on the principle of electromagnetic induction, which has the advantages of high construction efficiency and strong resolution ability, and is widely used in mineral exploration, oil and gas detection and other fields. In transient electromagnetic geophysical exploration, various interferences and noises are often introduced, and the power frequency and its harmonic interference caused by the high-voltage transmission grid and the grounding method of the power transformer are very common, especially near cities. And its harmonic interference is very strong. [0003] While receiving the transient electromagnetic signal, the receiving coil of the transient e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10G01V3/38
CPCG01V3/10G01V3/38
Inventor 王琦蒋川东王世刚贾博文杜海龙邹昕彤
Owner JILIN UNIV
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