浅层地下目标时域电磁散射问题的数值模拟
NUMERICAL SIMULATION OF TIME-DOMAIN EM SCATTERING BY SHALLOW SUBSURFACE OBJECTS
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摘要: 本文用时域有限差分法(FD-TD法)计算了浅层地下目标的时域电磁散射。在地下色散媒质的参数r()和r()都是以Debye方程表示时,推出了FD-TD法的迭代分式,并给出了相应的吸收边界条件。通过将FD-TD法计算的结果与其它结果相比较,证实了该方法对计算有耗媒质中电磁场问题的有效性。对瞬态脉冲在色散媒质中的传播特性进行了讨论。分别计算了典型地下目标的时域散射波形和波形堆积图。Abstract: The time-domain Electromagnetic(EM) scattering by buried objects in dispersive media is calculated by using FD-TD method. The FD-TD formula in Debye dispersive media(both the complex permeability and the complex permittivity are described by Debye equations) are deduced, and the absorbing boundary condition is given. The validity of FD-TD method in lossy media is verified through comparing the FD-TD s result and other one. The propagation of transient pulses in dispersive media is studied in detail. The scattering pulses and the wiggle traces for typical buried objects are given.
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