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给出了一种自由空间中导体柱电磁成像的数值方法。利用边界积分方程与边界元法求解电磁散射问题 ,由等效原理与格林函数的渐近式求得远区散射场 ,以测量的散射场和计算的散射场的最大偏差为目标函数 ,优化变量设置为描述导体柱形状的矢径参数r1,r2 ,r3 … ,r N,通过遗传算法对优化变量 r1,r2 ,r3 … ,r N 进行优化 ,使目标函数达到最小值来对自由空间中导体柱进行电磁成像。最后给出了包括对美国空军 ROME实验室提供的导体目标柱实际测量数据 ( Ipswich数据 )的成像结果。
A numerical method of electromagnetic imaging of conductor column in free space is given. Using the boundary integral equation and the boundary element method to solve the electromagnetic scattering problem, the far-field scattering field is obtained by the asymptotic formula of the equivalent Green’s function and the asymptotic behavior of the scattering field. The maximum deviation of the measured scattering field and the calculated scattering field is taken as the objective function, Set to describe the shape of the conductive rod diameter parameter r1, r2, r3 ..., r N, optimized by optimization of genetic algorithm variables r1, r2, r3 ..., r N, the objective function to a minimum value of the free space conductor Column for electromagnetic imaging. Finally, the imaging results including the actual measurement data (Ipswich data) of the conductor target column provided by the U.S. Air Force ROME Laboratory are given.