Method for calibrating time domain aviation electromagnetic altitude

An airborne electromagnetic and altitude correction technology, which can solve problems such as electric/magnetic exploration, radio wave measurement system, and sound wave reradiation, etc.

Inactive Publication Date: 2010-05-19
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

If the correction model is described by resistivity, the uniform half-space model correction method is the most suitable correction model, and only one parameter is resistivity, while the sheet conductance model needs to obtain two parameters, sheet conductance and sheet depth, to accurately obtain These two values ​​are much more difficult

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  • Method for calibrating time domain aviation electromagnetic altitude
  • Method for calibrating time domain aviation electromagnetic altitude
  • Method for calibrating time domain aviation electromagnetic altitude

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Embodiment Construction

[0052] The present invention is based on a single value function relationship between the magnitude ratio of the two-component induced electromotive force data and the resistivity, and obtains an equivalent and uniform airborne transient electromagnetic data at each correction time by the method of observation data query and local spline interpolation. The half-space resistivity sequence, and then calculate the uniform half-space response at the corrected altitude according to the instantaneous equivalent uniform half-space resistivity value, so as to obtain the corrected result of the new flight altitude. Specifically include the following steps:

[0053] (1) Input calculation parameters: query resistivity number m, logarithmic interval query resistivity sequence ρ i 0 , i=1, 2,..., m, local spline interpolation parameter Np; aeronautical transient electromagnetic system parameters: flying height h0, correction height h1, transmitting magnetic moment M, receiving coil effect...

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Abstract

The invention discloses a method for calibrating the time domain aviation electromagnetic altitude, which comprises the following steps of: performing joint calculation on an equivalent homogeneous half-space resistivity sequence by using induced electromotive force data of an x component and a z component; and performing forward calculation on each transient induced electromotive force response data of the homogeneous half-space model under the condition of a calibrated altitude by using the equivalent homogeneous half-space resistivity as a resistivity parameter value of a homogeneous half-space model to obtain the final calibration result, wherein the innovation of the method is that the equivalent homogeneous half-space resistivity value is used for achieving the observation on the induced electromotive force data calibration. The method has a quick calculating speed and small relative errors for the calibration result, and accords with the requirements on processing aviation electromagnetic data.

Description

technical field [0001] The invention relates to a time-domain aeronautical electromagnetic altitude correction method, which belongs to the category of time-domain aeronautical electromagnetic data processing methods. Background technique [0002] The time-domain airborne transient electromagnetic method is a fast and efficient geophysical exploration method, which plays an important role in geological mapping, mineral resource investigation, groundwater exploration and so on. Compared with the ground method, in the airborne electromagnetic method, the flight speed of the aircraft is fast and the work efficiency is high, but on the other hand, the vibration of the aircraft in the aerial measurement method is easy to cause the fluctuation of the flight altitude, and the error of the altitude count data will cause the recorded altitude data There is a large deviation from the true height. The deviation of height data will lead to false anomalies on the profile, and the invers...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 毛立峰胡平孟庆敏李文杰王绪本
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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