A Numerical Method for Analyzing Electromagnetic Scattering Properties of a Moving Conducting Object
A Numerical Method for Analyzing Electromagnetic Scattering Properties of a Moving Conducting Object
复制标题
分析运动导电物体电磁散射特性的数值方法
DOI：
10.1155/2014/386315
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发表时间：
2014-01-01
影响因子：
1.5
通讯作者：
Dong, Danan
中科院分区：
文献类型：
--
作者：
Kuang, Lei;Zhu, Shouzheng;Dong, Danan
提出了一种基于时域有限差分（FDTD）算法的运动导体电磁散射特性数值分析方法。在时域有限差分算法中引入了相对论边界条件来计算运动边界上的电磁场。为了提高计算效率和解的稳定性，提出了一种求解散射场的改进方法。该方法首先模拟了一维运动导体表面的时谐散射场。数值结果表明，散射场的幅值和频率发生了调制位移。然后计算了瞬态散射场，通过快速傅里叶变换（FFT）得到了运动导体表面的宽带电磁散射特性。最后，对二维运动方柱体散射场进行了分析。数值结果证明了运动导体物体的多普勒效应。模拟结果与分析结果吻合较好。
A novel numerical approach is developed to analyze electromagnetic scattering properties of a moving conducting object based on the finite-difference time-domain (FDTD) algorithm. Relativistic boundary conditions are implemented into the FDTD algorithm to calculate the electromagnetic field on the moving boundary. An improved technique is proposed to solve the scattered field in order to improve the computational efficiency and stability of solutions. The time-harmonic scattered field from a one-dimensional moving conducting surface is first simulated by the proposed approach. Numerical results show that the amplitude and frequency of the scattered field suffer a modulation shift. Then the transient scattered field is calculated, and broadband electromagnetic scattering properties of the moving conducting surface are obtained by the fast Fourier transform (FFT). Finally, the scattered field from a two-dimensional moving square cylinder is analyzed. The numerical results demonstrate the Doppler effect of a moving conducting object. The simulated results agree well with analytical results.