Orthogonal panel mesh based complex ground surface ground penetrating radar imaging method

By combining orthogonal body-fitting meshes and amplitude-preserving imaging methods, the imaging accuracy and stability problems of traditional ground-penetrating radar in complex terrains have been solved, achieving high-precision imaging of underground structures, which is particularly suitable for complex geological environments.

CN121386020BActive Publication Date: 2026-07-10CHONGQING UNIV
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Patent Information

Application Number
CN202511438867.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-10-10
Publication Date
2026-07-10
Estimated Expiration
2045-10-10

AI Technical Summary

Technical Problem

Traditional ground-penetrating radar imaging methods struggle to achieve high-precision inversion and effective signal extraction when dealing with complex terrain and non-uniform media. Furthermore, they suffer from low computational efficiency and cannot accurately reflect the electromagnetic characteristics of underground structures.

Method used

A method based on orthogonal body-fitted meshes is adopted, which combines the finite difference time-domain method and the conjugate gradient method. By accurately dividing the mesh and processing the ground-penetrating radar signal through back extrapolation, a high-precision underground imaging profile is generated. The Ryskin–Leal method is used to generate an orthogonal mesh that fits the ground surface, and the electromagnetic wave underground propagation velocity model is optimized by combining iterative inversion method.

Benefits of technology

It improves the imaging accuracy and stability of ground-penetrating radar in complex geological environments, can generate accurate underground imaging results under low signal-to-noise ratio conditions, effectively suppresses noise interference, and improves the imaging quality of underground structures.

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Abstract

The application discloses a complex ground surface ground penetrating radar amplitude-preserving imaging method based on an orthogonal skin mesh, and comprises the following steps: 1) constructing a ground surface model according to ground fluctuation data; constructing an electromagnetic wave underground propagation speed model according to geological exploration data; 2) generating an orthogonal skin mesh by using a Ryskin-Leal method; 3) discretizing the orthogonal skin mesh by using a finite difference time domain method; 4) performing reverse extrapolation on the received ground penetrating radar signal, and reversely propagating the electromagnetic wave field to an initial time; in the reverse extrapolation process, the spatial position of a reflection interface is calculated through a cross-correlation imaging condition, and an underground imaging profile is obtained; 5) calculating a target function gradient, and solving an inversion problem by using a conjugate gradient method to iteratively update the electromagnetic wave underground propagation speed model; and 6) generating an imaging profile of an underground structure according to the iteratively converged electromagnetic wave underground propagation speed model. The application significantly improves the precision, stability and anti-noise performance of underground imaging.
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