根據物理光學理論、理想導體邊界條件和阻抗邊界條件，建立了理想導體及有耗介質涂敷其表面的電大尺寸平板的物理光學高效算法公式，并將此公式推廣到圓柱和球等相似表面。通過計算，給出了平板及圓柱的驗證結果。以一個超大電尺寸目標RCS的計算實例充分證明了該方法的高效性和實用性。
關 鍵 詞 物理光學方法; 高效算法; 超大電尺寸目標; 目標電磁散射特性

Abstract Based on the physical optics(PO) theory , perfectly electrical conductor(PEC)and leontovich boundary condition(IBC), the high-efficiency formula of the conducted flat and the PEC flat coated with radar absorb materials(RAM) is built up .This formula can also be used on the surface of cylinder and sphere surfaces. Meanwhile，several results are given to demonstrate the validation of this method. Finally, radar cross section (RCS) of an object with super large electrical size computed by this method shows the high efficiency and practicality.
Key words physical optics method; high-efficiency method; super large electrical size; electromagnetic characteristic of scattering