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研究了二维海面上三维金属目标的电磁散射计算以及合成孔径雷达(SAR)成像技术.基于物理光学法、几何光学法和射线弹跳法计算了海面与目标镜面反射及相互耦合作用;并用等效电流法计算了目标的棱边绕射作用,该方法考虑了阴影效应,同时为了消除人为截断引起的边缘衍射,采用锥形入射波入射.应用蒙特卡罗法生成的Pierson-Moskowitz谱粗糙面模拟实际海洋面,计算海面上立方体及舰船的双站雷达散射截面,通过与数值算法的结果相比较,验证了该算法的正确性.运用该解析法快速获取不同频率、不同角度入射波照射下海面与目标的复合后向散射场数组,结合SAR成像技术,得到海面上立方体以及不同姿态舰船目标的SAR成像结果.该研究成果在实际海洋遥感、海面上军事目标的探测与识别等领域中具有重要的应用价值.
The electromagnetic scattering calculation and the synthetic aperture radar (SAR) imaging technique for three-dimensional metal targets on two-dimensional sea surface are studied.The specular reflection and mutual coupling between the sea surface and the target are calculated based on the physical optics method, the geometrical optics method and the ray bouncing method. The current diffraction method is used to calculate the edge diffraction of the target, which takes into account the shadow effect. In order to eliminate the edge diffraction caused by human truncation, a cone-shaped incident wave is used to simulate the Pierson-Moskowitz spectrum rough surface generated by Monte-Carlo method On the actual ocean surface, the double radar cross section of the cube and the ship on the sea surface is calculated, and the correctness of the algorithm is verified by comparing with the numerical algorithm.Using the analytic method to get the radiation of different frequencies and different angles Combined with the backscattering array of the sea surface and the target array, combined with SAR imaging technology, the SAR imaging results of the sea surface cube and the different attitude ship targets are obtained.The results of this study are useful in the fields of actual ocean remote sensing, detection and recognition of military targets on the sea surface Has important application value.