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Robust estimation method for impedance tensor of STRATAGEM crustal magnetotelluric measurement system

A measurement system, magnetotelluric technology, applied in radio wave measurement system, electromagnetic/magnetic exploration, geophysical measurement, etc., to avoid possibility and improve reliability

Active Publication Date: 2011-07-06
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a robust estimation method for the impedance tensor of the STRATAGEM magnetotelluric measurement system for the defects of the existing magnetotelluric impedance estimation method, so as to improve the reliability of the estimation

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] The main innovation point of the present invention is that the maximum likelihood estimation (M estimation) in statistics is introduced in the independent observation of STRATAGEM system, makes the data of multiple independent observations all participate in final impedance calculation, other relevant FFT transformation (Fourier transform transformation), the superposition of the original frequency point spectrum, the calculation of the cross power spectrum and the calculation of the impedance value are all well-known technologies in the art.

[0033] Such as figure 1 As shown, a robust estimation method for the impedance tensor of the STRATAGEM magnetotelluric measurement system includes the following steps:

[0034] (1) Read the original time series data and obtain the original results of multiple independent observation time series of a sin...

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Abstract

The invention belongs to a geophysical data processing method, and in particular relates to a robust estimation method for an impedance tensor of a STRATAGEM crustal magnetotelluric measurement system (EH4 measurement system). In the method, maximum likelihood estimate (M estimate) in statistics is introduced into independent observation of the STRATAGEM system, so that the data of a plurality of independent observation processes participate in the operation of final impedance; but the weight value (weight) for each observation process to participate in the calculation is different. Therefore, the possibility that a certain independent observation can influence the overall calculation result in the least square estimation is avoided, and the reliability and the robustness of the estimation are improved.

Description

technical field [0001] The invention belongs to a geophysical data processing method, in particular to a robust estimation method of the impedance tensor of a STRATAGEM magnetotelluric measurement system. Background technique [0002] The STRATAGEM (EH4) magnetotelluric measurement system is an advanced magnetotelluric (audio) measurement device introduced into my country at the end of the last century. There are currently more than 100 sets of this equipment in China, which are widely used in searching for groundwater and resource exploration. But the data processing software (IMAGEM) that the system is equipped with still adopts the relatively original magnetotelluric impedance estimation method - the least square method. Since the interference signals in individual periods affect the least squares estimation results, the impedance curves obtained by combining operations in different periods may be quite different, resulting in two results: [0003] (1) The number of fly...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
Inventor 腰善丛刘祜张儒亮
Owner BEIJING RES INST OF URANIUM GEOLOGY