Magnetic Gradient Tensor Transformation Method Based on Three-dimensional Equivalent Source in Frequency Domain

doi:10.3969/j.issn.1000-1093.2020.11.021

Abstract

Abstract: A magnetic gradient tensor transformation method based on three-dimensional equivalent source in frequency domain is proposed for the complex design and great noise effect of the equivalent source calculation method under the condition of traditional space domain. Firstly,a magnetic gradient tensor forward modeling theory of the underground horizontal rectangular parallelepiped layer based on the frequency domain is proposed, which provides a theoretical basis for the inversion calculation of frequency domain. And then a three-dimensional equivalent source of frequency domain is constructed, and the iterative method is used to determine the depth and precision of the underground mesh division, which realizes the automation of the calculation process. Finally, the C-norm regularization selection method is used to perform forward calculation on the magnetic gradient tensor data of underground equivalent source model, which improves the stability of the calculated results. The simulated and experimental results show that the proposed method can accurately reflect the magnetic gradient tensor data of magnetic anomalies under noise conditions, and has good noise immunity and computational efficiency.

Key words: equivalentsource, frequencydomain, magneticgradienttensor, iterativemethod, C-normregularizationselectionmethod

CLC Number:

O441.2

LI Jinpeng, FANG Hongbo, ZHANG Yingtang, LI Zhining, YIN Gang, SUN Fucheng. Magnetic Gradient Tensor Transformation Method Based on Three-dimensional Equivalent Source in Frequency Domain[J]. Acta Armamentarii, 2020, 41(11): 2326-2337.

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