A concealed target precision detection method based on three-dimensional imaging of vector magnetic anomaly

Abstract

This application belongs to the field of precision detection technology for concealed targets, and specifically relates to a method for precision detection of concealed targets based on three-dimensional imaging of vector magnetic anomalies. The method comprises the following steps: S1, acquiring three-component magnetic anomaly data; S2, dividing the underground space of the detection area into M small cuboid units; S3, constructing a kernel matrix A based on the contribution of each unit to the anomaly response of the observation point in step S2, and establishing a forward modeling equation; S4, constructing a depth-weighted matrix Wz, and correcting the kernel matrix A from step S3 to obtain A′=AWz; S5, constructing an inversion objective function based on the forward modeling equation from step S3, the corrected kernel matrix A′ from step S4, and the model parameter m′; S6, differentiating the objective function from step S5 and solving the regularized equation set; and S7, determining the three-dimensional spatial location and magnetic characteristics of the concealed target. This invention utilizes three-component magnetic vector anomalies for three-dimensional imaging, reducing inversion ambiguity and improving positioning accuracy. It is suitable for detecting concealed targets such as underwater ships, unexploded ordnance, and underwater pipelines.

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