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
-
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.
-
Yee K S, IEEE Trans. on AP, 1966, AP-14(3): 302-307.[2]TaHove A, et al. Pro[J].IEEE.1989, 77(5):682-699[3]方广有,等.电波科学学报,1991, 6(4): 1-9.[4]Lao Z P, et al. Scientia Sinica, 1984, XXVII(10): 1065-1076, 1984.[5]Bolomey J C, et al. IEEE Trans on AP, 1978, AP-26(5): 658-667.[6]King R W P, et al. Antennas in Matter: Fundamentals, Theory, and Applications. USA: The MIT Press, 1981: 253-425. -
计量
- 文章访问数: 1888
- HTML全文浏览量: 105
- PDF下载量: 762
- 被引次数: 0
下载:
