Abstract: Three-dimensional reconstruction method for small scale magnetic target based on shape inversion is studied in this paper. Firstly, the magnetic gradient tensor data is used to estimate the approximate horizontal boundary, vertical boundary and magnetization direction. On this basis, the range of inversion space is selected, the inversion space is gridded, the initial inversion model and the module sets to be increased are given. Then, based on the established module selection function, the optimal growth module is selected in the module sets to be increased, and the inversion model of magnetic target and the module sets to be increased are updated iteratively until the threshold of the iterative objective function is achieved. Finally, the inversion model is the three-dimensional reconstruction results of small scale magnetic target. Simulation result shows that the three-dimensional reconstruction results have high similarity with the real target, and it can be used in the identification applications of magnetic targets.

Key words: magnetic target; shape inversion; magnetic gradient tensor; three-dimensional reconstruction; tilt angle; local wavenumber method