A quasi-three-dimensional space constrained integral global inversion method for aero-electromagnetic data of fixed wing in time domain

Abstract

The invention relates to a quasi-three-dimensional space constrained integral inversion method for aero-electromagnetic data of a fixed wing in time a domain. The method includes: firstly, setting aninitial model and a regularization coefficient to forward calculate error items of survey area data for each survey point data; secondly, if the error term does not reach the inversion termination condition, establishing the pseudo-three-dimensional space constrained global inversion objective function of the conductivity and attitude angle of each underground layer; finally, judging again whetherthe data error term reaches the inversion termination condition, that is to say, an inversion result is obtained. The method considers the continuity among the measuring lines, and also adds the flight attitude angle. Quasi-three-dimensional constrained inversion is introduced to ensure the accuracy of the inversion results. Not only the resistivity of each underground layer and the inversion parameters of each measuring point of a single measuring line are constrained, but also the measuring lines in the surveying area are constrained as a whole. The attitude angle correction can not be carried out directly due to the inaccuracy or absence of the attitude angle. The results of quasi-three-dimensional constrained global inversion are better than those of quasi-two-dimensional global inversion.

Description

technical field [0001] The invention relates to a time-domain airborne geophysical exploration method, in particular to a fixed-wing time-domain airborne electromagnetic data quasi-three-dimensional space-constrained overall inversion method. Background technique [0002] Fixed-wing aeronautical electromagnetic detection has the advantages of high work efficiency, wide detection area and deep detection depth, and has a wide range of applications in mineral detection and geological surveys. At the same time, fixed-wing aeronautical electromagnetic detection has problems such as a large amount of data and inconsistent flight attitudes in the survey area data, which leads to difficulties in data interpretation and incomplete imaging of inversion results. [0003] Airborne electromagnetic one-dimensional inversion independently inverts the data of a single survey point, ignoring the correlation between adjacent survey points, resulting in discontinuous inversion results, and lar...

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Problems solved by technology

[0010] The present invention is mainly aimed at the existing inversion method only constraining the adjacent measuring points, ignoring the continuity of the airborne electromagnetic adjacent surveying line data, which may cause the loss of effective information; in addition, the existing inversion method ignores the flight attitude angle ( Discover the influence of the pitching attitude of the transmitting coil and the receiving coil and the pod swinging in the same direction) on the inversion results

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