用积分方程求解散射体自然频率的新方法

散射物体自然频率(极点)对目标识别有重大意义,奇点展开法采用矩量法化积分方程为矩阵方程,通过求解系统矩阵行列式零点来获得极点。提出了一种直接从积分方程出发,对积分核函数作快速傅里叶变换(FFT),通过求解FFT获得的各分量在复平面上的零点来求取散射体极点的新方法,并以细线导体为例,在很短时间内计算出精度很高的极点。

A New Algorithm for Calculating Poles of A Scattering Object

The natural resonances(poles) of a scattering object are important for the target identification.A new method is proposed in this paper to calculate poles,which points out that the zeros of the fast Fourier transform of the integral kernel function are the poles of the scattering object.As an example,the poles of a thin wire conductor are obtained with high precision in very short time by using this method.