基于时域混合场积分方程求解目标瞬态散射特性
doi: 10.3724/SP.J.1146.2006.01100
The Solution of Time-Domain Combined Field Integral Equation for Transient Scattering by Conducting Surfaces of Arbitrary Shape
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摘要: 当入射平面波的频谱包含目标的谐振频点时，时域电场积分方程和时域磁场积分方程求解的表面电流不稳定，会出现后期震荡现象。通过线性组合时域电场积分方程和时域磁场积分方程，可以获得一种混合场积分方程。数值结果显示，这种混合场积分方程消除了因内部谐振引起的后期震荡，得到了稳定的表面电流分布和远区散射场。Abstract: The time-domain EFIE and MFIE approaches produce late-time oscillation for transient scattering responses from conducting objects when the incident spectrum of the field contains frequency components, which may correspond to the internal resonance of the structure. A time-domain Combined Field Integral Equation (CFIE) is presented. This formulation is based on a linear combination of the time-domain EFIE with MFIE. Numerical results for the EFIE, MFIE, and CFIE are presented and compared with those obtained from the Inverse Discrete Fourier Transform (IDFT) of the frequency-domain CFIE solution. And the time-domain CFIE solutions devoid of any resonant components.
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