S波段超宽带地面电磁散射特性的仿真研究

Study on Simulation of Ground UWB Electromagnetic Scattering Characteristics in S Band

为了得到超宽带信号的后向电磁散射特性,提出利用计算电磁学中的色散介质FDTD方法解决该问题。首先利用Diamond-Square分形算法生成随机粗糙面,容易控制地形高程差和起伏程度,然后采用类似MIMICS森林散射模型的介质分层方法模拟小麦植被,从而模拟了三维平原小麦地场景,最后对截取的二维场景进行了S波段后向散射特性电磁仿真。仿真结果和参考文献的实验结果基本吻合,接近实际情况,证明了所提算法的有效性。

In order to get the backward electromagnetic scattering characteristics of UWB signal, a dispersive medium FDTD method in computational electromagnetism is proposed. Firstly, random rough surface is generated by the Diamond-Square fractal algorithm, then the terrain height difference and the degree of fluctuation can be controlled easily. Secondly, the wheat vegetation covered terrain is simulated by using MIMICS model. After that, the three-dimensional plain of wheat field is simulated, and two dimensional scene is captured. At last, the S band electromagnetic simulation of the scene is carried out. The simulation result coincides basically with the experimental result of reference, which proves the method is effective.