Subsurface imaging of buried objects from FDTD modeled scattered field

The ground penetrating radar (GPR) finite-difference time-domain (FDTD) simulation method and an improved back projection (BP) imaging algorithm are presented. Because of the close proximity of the elements in the GPR system, the system cannot be easily modeled by considering its individual components separately. A generalized perfectly matched layer (GPML) absorbing boundary condition (ABC) is employed to terminate the FDTD computational domain. In GPR imaging, the traditional BP algorithm is restricted by the air-soil interface and the conductivity property of the soil. An improved BP algorithm is presented. Numerical simulations and measurements using the HRGPR-01 system are provided to illustrate the performance of the GPMLABC technique. The imaging result is also shown.