Magnetotelluric data denoising method and system
A magnetotelluric and data technology, applied in the field of magnetotelluric data denoising methods and systems, can solve problems such as electromagnetic interference, low-frequency information loss, difficult removal, etc., achieve obvious effects, speed up the removal speed, and improve data processing efficiency.
Pending Publication Date: 2022-02-18
BEIJING RES INST OF URANIUM GEOLOGY
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However, while extracting the noise waveform, the generalized morphological filter also extracts the slow changes in the time-domain curve, resulting in the loss of low-frequency information
In response to this problem, Tang Jingtian (2012) proposed a magnetotelluric time-domain noise suppression scheme based on mathematical morphology top-hat transform, using the top-hat transform to detect peaks and troughs, using linear structural elements, to The magnetotelluric time-domain signal is denoised. The denoising results show that the proposed method can remove the noise waveform and retain the slow change of the time-domain signal. However, this method needs to select structural elements of different lengths for waveforms with different widths. It is difficult to remove all the noise in the time series
[0005] Aiming at the serious problem of electromagnetic interference, a new method or system for detecting electromagnetic interference in the magnetotelluric time series is urgently needed
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0049] The object of the present invention is to provide a method and system for denoising magnetotelluric data, which can effectively remove noise in magnetotelluric data and improve data processing efficiency.
[0050] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
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The invention relates to a magnetotelluric data denoising method and system. The method comprises the following steps of acquiring a magnetotelluric time sequence according to magnetotelluric data, determining an error ellipsoid according to the magnetotelluric time sequence, performing outlier elimination on the magnetotelluric time sequence according to the error ellipsoid, and repairing the magnetotelluric time sequence, and reconstructing magnetotelluric data according to the repaired magnetotelluric time sequence. The noise in the magnetotelluric data can be effectively removed and the data processing efficiency can be improved.
Description
technical field [0001] The invention relates to the technical field of magnetotelluric data preprocessing, in particular to a method and system for denoising magnetotelluric data. Background technique [0002] With the development of society and the increase of human activities, mines, quarries, high-voltage lines, electrical equipment, radar stations, and radio stations are densely distributed near the survey area, and the types of magnetotelluric noise are complex and diverse, with strong energy amplitude, good correlation, and frequency. The coverage is extremely wide, and the existing frequency domain processing methods are helpless to this type of strong noise interference. The problem of magnetotelluric noise has been puzzling the vast number of magnetotelluric researchers. How to eliminate the noise interference in the magnetotelluric signal and improve the quality of the magnetotelluric sounding data is a major difficulty. [0003] The methods of magnetotelluric den...
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IPC IPC(8): G01V3/38
CPCG01V3/38Y02A90/30
Inventor 张志勇王寒冰王春阳刘钧沅黄建乐
Owner BEIJING RES INST OF URANIUM GEOLOGY