Correction of the Scattering Center Positions for 3-D Imaging of Deep Concave Objects Based on High-Frequency Approximation

In the detection and recognition of complex targets by millimeter wave technology, the multiple scattering caused by concave structure will result in the mismatch between the imaging position and the actual position of the target, and the accurate contour of concave structure cannot be obtained. In this paper, we obtain the propagation paths that mainly contribute to different reflection times through high-frequency approximation analysis, and perform corresponding backward compensation successively to achieve the position correction of the scattering centers for the three-dimensional concave structure. The simulation results show that the proposed method can effectively reconstruct the contour of the three-dimensional concave structure.