二维分形海面雷达后向散射截面

Back Scattering RCS of Two-Dimensional Sea Fractal Surface

本文中通过坐标变换 ,在局部坐标系中 ,建立起了散射场与入射场之间的关系表达式 ,推导出二维分形海面散射矩阵 ,利用此结果数值模拟二维分形海面的全极化后向雷达截面不同入射角的分布 ,并数值模拟了不同风向时 ,后向散射雷达截面的变化 .发现四种极化方式下的雷达后向散射截面随入射角和风向分布图形完全相同 ,仅在数值上相差常数 .

We establish the relation expression between scattering fields and illuminating fields in local coordinate system. Simulating horizontally polarized and vertically polarized incident waves, we can get all elements of scattering matrix. The result can be used to numerically simulate the distribution of the fully polarized backscattering RCS (Radar Cross Section) of sea fractal surface. The changing of fully polarized backscattering RCS with different directions of flying direction are simulated. The result shows that the distributions of the fully polarized backscattering RCS of different of flying direction are identical among the four sorts of polarization. Our model is the base of fully polarizing radar imaging.