淺層地下目標時域電磁散射問題的數(shù)值模擬
NUMERICAL SIMULATION OF TIME-DOMAIN EM SCATTERING BY SHALLOW SUBSURFACE OBJECTS
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摘要: 本文用時域有限差分法(FD-TD法)計算了淺層地下目標的時域電磁散射。在地下色散媒質的參數(shù)r()和r()都是以Debye方程表示時,推出了FD-TD法的迭代分式,并給出了相應的吸收邊界條件。通過將FD-TD法計算的結果與其它結果相比較,證實了該方法對計算有耗媒質中電磁場問題的有效性。對瞬態(tài)脈沖在色散媒質中的傳播特性進行了討論。分別計算了典型地下目標的時域散射波形和波形堆積圖。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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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]方廣有,等.電波科學學報,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. -
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