Ground penetrating radar multilayer distance migration imaging method based on self-focusing technology

Abstract

The application provides a ground penetrating radar multilayer distance migration imaging method based on a self-focusing technology.The method comprises the following steps: firstly, a ground penetrating radar signal model is established, a three-dimensional longitudinal wave wave equation is derived, and a wave field phase continuation is used to solve the discontinuity of electromagnetic waves at the medium layering; then, the wave field phase continuation is used to obtain the receiving wave field distribution of the medium interface, and distance migration imaging is performed on each layered medium; self-focusing metrics such as high-order, entropy, contrast and intensity are used to evaluate the target migration result, and the extreme value point is selected to solve the real dielectric constant value; the dielectric constant value estimated by the self-focusing technology is used for imaging, and the distance migration imaging result of the layered medium is obtained by splicing in the distance direction. The method can overcome the problems that the existing ground penetrating radar imaging method is difficult to image under the condition that the dielectric constant of the scene is unknown and is not applicable to the layered medium scene, and can realize fast and accurate imaging of the layered medium scene under the condition that the dielectric constant is unknown.

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