Relativistic FDTD Analysis of Far-Field Scattering of a High-Speed Moving Object
Relativistic FDTD Analysis of Far-Field Scattering of a High-Speed Moving Object
复制标题
高速运动物体远场散射的相对论FDTD分析
DOI：
10.1109/lawp.2014.2382667
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发表时间：
2015-01-01
影响因子：
4.2
通讯作者：
Zheng, Zhengqi
中科院分区：
文献类型：
--
作者：
Kuang, Lei;Xu, Feng;Zheng, Zhengqi
本文分析了均匀运动导体和介质目标的远场散射。利用洛伦兹变换，将实验室坐标系中相对于自由空间静止的高速运动物体的散射问题，转化为静止坐标系中随运动物体运动的静止物体的散射问题。然后采用时域有限差分法（FDTD）求解近区散射场。在静止坐标系下，应用近远场变换，得到远区散射场。随后，散射场被转换回实验室框架。我们的方法是验证对以前发表的结果的情况下，均匀移动的二维物体。数值算例表明，对于高速目标，运动对双基地雷达散射截面（RCS）和多普勒的影响是不可忽略的。
Far-field scatterings of uniformly moving conducting and dielectric objects are analyzed in this letter. Using the Lorentz transformation, the scattering problem of a high-speed moving object in the laboratory frame, which is stationary with respect to the free space, is transformed to that of a motionless object in the rest frame that moves with the moving object. Then the near-zone scattered fields are solved by the Finite Difference Time Domain (FDTD) algorithm. Applying near-to-far field transformation, farzone scattered fields are acquired in the rest frame. Subsequently, the scattered fields are transformed back to the laboratory frame. Our approach is validated against previously published results for the case of a uniformly moving two-dimensional object. Numerical examples show that the effects of the motion on the bistatic radar cross sections (RCS) and Doppler are non-negligible for high-speed objects.