Simulation of UWB echoes from ground based on CPML-FDTD

In designing some UWB-IR (ultra-wideband impulse radio) devices, the effects of ground echoes must be taken into consideration. The dispersion of soil and roughness of ground surface are significant factors in ground echoes calculation. FDTD (finite difference of time domain) algorithms applied in ground echo simulation at present have the problems of slow speed or large errors. By using multi-pole Debye model as soil dielectric coefficients, and CPML (convolutional perfectly matched layer) as absorption boundary condition, a CPML-FDTD algorithm is derived in multi-pole Debye media. Simulations are carried out under different conditions, and comparison with non-PML FDTD algorithm proves the validity and efficiency of the proposed algorithm.