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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。
The natural frequency (pole) of the scattering object is of great significance to the target recognition. Singular point expansion method uses the method of moment integral equation as the matrix equation, and obtains the pole by solving the system matrix determinant zero point. A new method to get the poles of scatterers by taking the fast Fourier transform (FFT) of the integral kernel function directly from the integral equation and solving for the zero of the components obtained by FFT on the complex plane is proposed. For example, a conductor with high accuracy is calculated in a very short period of time.