The Fast High Frequency Method for Calculating Scattered Fields from the Electrically Large Scatterers

In this paper, we proposed the fast physical optics (FPO) method to improve the efficiency of the traditional computation method for calculating the PO scattered fields. Based on the quadratic discretization, both of the quadratic amplitude and phase functions are derived by using the Langrange interpolation techniques. The scattered fields of the PEC scatterers and coated scatterers are both considered in this paper. The multilevel technology is introduced to deal with the multi-frequencies and multi-angles scattering cases. Compared with the brute force (BF) method, the numerical experiments demonstrate that this method could significantly reduce the workload while maintains the accuracy.