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High-precision downward continuation method of geospatial time domain electromagnetic system based on improved iterative method

A technology of time-domain electromagnetic and iterative method, which is applied in radio wave measurement system, sound wave reradiation, electric/magnetic exploration, etc., can solve the problems of little change and inability to change the instability of e-index items, etc., and achieve iteration The effect of less frequency and high precision

Active Publication Date: 2018-12-25
JILIN UNIV
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Problems solved by technology

The inverse continuation method released by patent 201610005275.3 changes the sign of the height parameter in the continuation operator in the upward continuation of FFT and adds i(k x x+k y y) item, but still cannot change the instability of the e index item at high frequency, and the accuracy is improved compared with the unextended time, but the change is not large

Method used

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  • High-precision downward continuation method of geospatial time domain electromagnetic system based on improved iterative method
  • High-precision downward continuation method of geospatial time domain electromagnetic system based on improved iterative method
  • High-precision downward continuation method of geospatial time domain electromagnetic system based on improved iterative method

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Embodiment

[0034] see figure 2 combine figure 1 As shown, a high-precision continuation method of the earth-space time-domain electromagnetic system based on the improved iterative method includes:

[0035] 1) Calculate the induced electromotive force of the long ground wire source on the surface z=0 plane, and the receiving points need to be equally spaced, and use the FFT upward continuation theory to calculate the air induced electromotive force of the z=h (h>0) plane;

[0036] Such as figure 1 As shown, in step 1), according to the calculation formula of the long ground wire source layered earth magnetic field response in z direction:

[0037]

[0038] Where L is the half length of the long ground wire, R=[(x-x′) 2 +y 2 ] 1 / 2 , is the reflection coefficient, u 0 ≈λ. Then use the Guptasarma frequency-time transformation method to transform it from the frequency domain to the time domain, so as to obtain the surface theoretical induced electromotive force f (x, y, z = 0). ...

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Abstract

The invention relates to a high-precision downward continuation method of a geospatial time domain electromagnetic system based on an improved iterative method, and aims to improve the downward continuation precision of geospatial electromagnetic data and further improve the interpretation precision of the electromagnetic data. The method mainly comprises the following steps: calculating a surface, air theoretical induction electromotive force; determining a surface initial induction electromotive force; determining and correcting parameters in an iteration formula by a fish swarm algorithm; correcting a surface field step by step by a corrected iterative formula; determining a value of the surface induction electromotive force by a preset precision; ; verifying with a theoretical surfacevalue to prove the correctness of the improved iterative method; measuring the air induction electromotive force by a receiving coil sensor; performing baseline correcting, superposition and samplingon the measured data; continuing the surface induction electromotive force based on the improved iterative method; performing apparent resistivity and depth calculation; and finally improving the interpretation precision of the geospatial electromagnetic data.

Description

technical field [0001] The invention relates to a high-precision continuation method for an earth-space time-domain electromagnetic system based on an improved iterative method in the field of geophysical exploration, and is especially suitable for the detection method of the earth-space time-domain electromagnetic system. Background technique [0002] The launch device of the ground-space time-domain electromagnetic detection system is located on the surface of the ground, usually with an electrical source as the main source, and transmits a high-power current underground. The receiving device is fixed in unmanned aircraft such as drones and airships, and the z-component induced electromotive force containing underground information is obtained through ground and air collaborative measurement methods. Compared with aeronautical electromagnetic detection systems, it has the advantage of deeper detection depth , and compared with the ground electromagnetic detection system, i...

Claims

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Application Information

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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 关珊珊姜曜黎东升嵇艳鞠
Owner JILIN UNIV
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