改进的物理光学法分析远场目标的电磁散射特性

An Improved Physical Optics Method for the Computation of Electromagnetic Scattering of Objects in Far-Field

提出一种改进的物理光学(PO)法来计算远场目标的电磁散射特性。这种方法通过严格的积分变换,经过详细推导,给出了目标单站RCS表达式,可以有效地处理任意外形的纯导体的雷达散射截面计算问题。通过Stokes变换,传统PO表达式中面积分转换为线积分,使得计算效率明显提高。通过一个金属圆形平板和一个金属三角板的算例演示,验证了新方法和PO的精度是相当的。最后,还展示了一个3维的例子。

An improved physical optics （PO） method for the computation of eletromagnetic scattering of objects in farfield is presented, It is general to compute the radar cross section （RCS） of arbitrarily shaped metal objects by rigorously transforming the radiation surface integral of PO method to a line integral along the metal boundary. After detailed derivation, we have obtained the calculated expression. By using Stokes transformation, the surface integral in the traditional expression of the PO has been changed into the line integral, then Computation time can be reduced in comparison with PO method. PO method and the proposed method are compared with respect to the numerically calculated RCS of a square plate and a triangu- lar plate. It is confirmed that these two methods are similar in accuracy. Finally, an example of application to a three-dimen- sional （3-D） body is demonstrated. Furthermore, the results of 3-D case also is comparatively satisfactory in practice. This work will also be beneficial to the solution of eletromagnetic scattering of objects in far-field.