Traditional finite difference time domain (FDTD) is classic numerical method for solving wave propagation problems such as electromagnetic wave, seismic wave and acoustic wave. As for airborne GPR simulation, modeling space is so large that memory consuming is pretty huge; on the other hand, the area between source antenna and ground surface is homogenous medium - air, where analytic solution could be adopted. We use analytic solution in free space and take use of numerical solution - FDTD in the underground. Different solutions are adopted in different region, and both of them are combined together, that is known as the multi-region FDTD (MR/FDTD) method. The MR/FDTD we discussed here is not the same as before. As we select one face instead of a closed surface as integration surface. The validity of the MR/FDTD method for airborne GPR simulation is investigated by numerical experiments in the work.
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