Modeling GPR Wave Propagation in Complex Underground Structures Using Conformal ADI-FDTD Algorithm

Ground Penetrating Radar (GPR) is a shallow geophysical method for detecting and locating subsurface targets. The GPR image echo characteristics of complex underground structures can be obtained by carrying out GPR forward modeling research. The traditional finite-difference time-domain (FDTD) metho...

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Bibliographic Details
Published in:Applied sciences 2022-05, Vol.12 (10), p.5219
Main Authors: Li, Yinping, Wang, Niannian, Lei, Jianwei, Wang, Fuming, Li, Ce
Format: Article
Language:English
Subjects:
Accuracy
ADI-FDTD
Algorithms
Approximation
Approximation method
Boundary conditions
complex underground structure
Computer applications
Computing time
Dielectric properties
Efficiency
Electric fields
Electromagnetism
Geophysical methods
GPR
Ground penetrating radar
Magnetic fields
Mathematical models
Methods
Model accuracy
numerical simulations
Propagation
Simulation
surface conformal technology
Underground structures
Wave propagation
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Summary:Ground Penetrating Radar (GPR) is a shallow geophysical method for detecting and locating subsurface targets. The GPR image echo characteristics of complex underground structures can be obtained by carrying out GPR forward modeling research. The traditional finite-difference time-domain (FDTD) method has low efficiency and accuracy. The alternating direction implicit FDTD (ADI-FDTD) algorithm surmounts the stability limitations of the traditional FDTD method, making it possible to select a larger time step for higher computational efficiency. For circular underground structures, a pseudowave produced by the ladder approximation method can be corrected using the surface conformal technique. This paper proposes a high-efficiency and high-accuracy GPR forward modeling method that combines the ADI-FDTD algorithm and surface conformal technology. The performance of the conformal ADI-FDTD algorithm is verified by a simple two-layer model. Based on the proposed algorithm, the GPR image features of three complex underground structure models are obtained. Finally, a field experiment is used to support the accuracy and usefulness of the conformal ADI-FDTD algorithm. The numerical simulation results and experimental results show that the conformal ADI-FDTD algorithm reduces the pseudodiffraction wave caused by the ladder approximation method and can significantly improve the computing efficiency for complex underground structure models.
ISSN:2076-3417
2076-3417
DOI:10.3390/app12105219