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Magnetotelluric impedance estimating method

An impedance estimation and magnetotelluric technology, applied in the field of magnetotelluric survey signal data processing and magnetotelluric impedance estimation, it can solve the problems of inaccurate estimated values, errors, and large influence of signal estimation, and achieves the improvement of measurement accuracy and reliability. Effect

Active Publication Date: 2013-02-27
NO 722 RES INST OF CHINA SHIPBUILDING IND
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AI Technical Summary

Problems solved by technology

Flying points have a great influence on signal estimation, which will lead to inaccurate or even wrong estimated values

Method used

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  • Magnetotelluric impedance estimating method

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Embodiment Construction

[0017] Such as figure 1 Shown is an embodiment of a kind of magnetotelluric impedance estimation method of the present invention, and concrete steps comprise:

[0018] Step 1), perform Fourier transform on the collected electric field signal and magnetic field signal to make it into frequency domain data, and control the frequency resolution of the electric field and magnetic field signal by changing the sampling rate and the series of Fourier changes; by downsampling By increasing the sampling rate and increasing the order of Fourier transform, the signal of low-end frequency can be obtained; by increasing the sampling rate and reducing the order of Fourier transform, the signal of high-end frequency can be obtained. When the sampling rate is 4kHz, the signal is subjected to 4096-order Fourier transform, and the estimated range of the electric field and magnetic field is 4000 / 4096~4000Hz; when the sampling rate is 512kHz, the signal is subjected to 512-order Fourier transfor...

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Abstract

The invention relates to a technology of processing magnetotelluric exploration signal data, and relates to a magnetotelluric impedance estimating method. The method comprises the following steps of: firstly, carrying out Fourier transform on an acquired electric field and magnetic field data, so as to transform the electric field and the magnetic field data into data of a frequency domain; secondly, carry out primary estimation on the impedance by using a least square method; calculating residual values of the electric fields in two directions; selecting a plurality of data groups with small residual values; selecting an appropriate scale value so as to weigh selected electromagnetic data; and recalculating the impedance by using the weighed data. By utilizing the estimation mode, the influence of a flying spot can be effectively eliminated, and the influence of a white gaussian noise is reduced, so that reliable impedance estimation values can be obtained.

Description

technical field [0001] The invention belongs to the magnetotelluric survey technology, specifically relates to the data processing of the magnetotelluric survey signal, and is a magnetotelluric impedance estimation method. Background technique [0002] Geophysical prospecting The method of magnetotelluric surveying usually collects data through magnetotelluric electric field and magnetic field sensors, and the output electric field and magnetic field signals enter the A / D conversion circuit to output digital signals through filtering and amplifying circuits, after filtering, sampling and gain control, etc. Processing, outputting electromagnetic signals for magnetotelluric impedance, and displaying the calculation results graphically to reflect the situation of the exploration target. [0003] Electromagnetic impedance is key to obtaining reliable electromagnetic measurement data. Since the electromagnetic method uses natural signals as the field source, the measured two ort...

Claims

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Application Information

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IPC IPC(8): G01V3/08
Inventor 易勇范育兵张斌曾歌明
Owner NO 722 RES INST OF CHINA SHIPBUILDING IND
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