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 forward modeling research. traditional finite-difference time-domain (FDTD) has low efficiency accuracy. alternating direction implicit FDTD (ADI-FDTD) algorithm surmounts the stability limitations method, making it possible to select larger time step higher computational efficiency. For circular structures, pseudowave produced ladder approximation corrected using surface conformal technique. This paper proposes high-efficiency high-accuracy that combines ADI-FDTD technology. performance verified simple two-layer model. Based on proposed algorithm, features three structure models are obtained. Finally, field experiment used support accuracy usefulness algorithm. numerical simulation results experimental show reduces pseudodiffraction wave caused significantly improve computing models.