雨杂波中介质圆柱目标的极化滤波增强

The polarization filtering enhancement of the dielectriccylinder target in the rain clutter

在极化域中对雨介质和目标的电磁波散射特性进行了研究.得出了雨区的散射矩阵和目标的散射矩阵.在毫米波段计算了雨区的后向散射引起的雨杂波功率密度随频率及降雨率的变化.对雨杂波中的有限长的介质圆柱目标的极化滤波增强进行了数值仿真,得到了其最优化信杂比在Poincare球上对应的位置,进而给出发射、接收天线应采取的最佳极化状态.

The electromagnetic scattering characteristics of rain media and targets are discussed in the polarization field, with the scattering matrix of rain area and targets are obtained. In the millimeter band, the variations are found of the power density of the rain clutter induced by back scattering with frequency and rain rate. The polarization filtering enhancement of the finite length cylinder in rain clutter are numerically modeled. Then, the position on the Poincare sphere corresponding to the maximum SCR can be confirmed, and the optimum polarization state of transmitting and receiving antennas can be given.