FINITE-DIFFERENCE TIME-DOMAIN SIMULATION OF GROUND-PENETRATING RADAR ON DISPERSIVE, INHOMOGENEOUS, AND CONDUCTIVE SOILS

A three-dimensional (3-D) time-domain numerical scheme for simulation of ground penetrating radar (GPR) on dispersive and inhomogeneous soil s with conductive loss is described, The finite-difference time-domain (FDTD) method is used to discretize the partial differential equation s for time stepping of the electromagnetic fields. The soil dispersion is modeled by multiterm Lorentz and/or Debye models and incorporated into the FDTD scheme by using the piecewise-linear recursive convoluti on (PLRC) technique, The dispersive Soil parameters are obtained by fi tting the model to reported experimental data. The perfectly matched l ayer (PML) is extended to match dispersive media and used as an absorb ing boundary condition to simulate an open space. Examples are given t c, verify the numerical solution and demonstrate its applications, The 3-D PML-PLRC-FDTD formulation facilitates the parallelization of the code. A version of the code is written for a 32-processor system, and an almost linear speedup is observed.