Scatering analysis of separated aperture sensor GPR for buried targets detection

To detect buried targets, the performance of the separated-aperture sensor (SAS) working as ground-penetrating radar (GPR) is assessed over the operating frequency band. An alternating-direction-implicit (ADI) finite-difference time-domain (FDTD) method has been used for electromagnetic simulation, together with the uniaxial perfectly matched layer absorbing boundary conditions. The nonorthogonal grids are applied to modeling the anomalistic regions of the target only to increase computational efficiency. The results are presented considering various practical parameters, such as the operating frequency, the electric properties of the ground soil and the buried target, and the depth at which the target is buried under the ground surface. It is shown that target detect-ability using the SAS is strongly dependent on above parameters. The simulating results have been verified by using the nonorthogonal ADI-FDTD method