表面辐射条件在非光滑凸散射体上的应用

Kriegsman等人(1987年)提出了一种计算凸体电磁散射的新技术表面辐射条件(OSRC)法。但当散射体存在奇异边缘时,用这种新技术求得的散射场与实际相差很远,大大地限制了OSRC法的应用范围。本文考虑到奇异边缘的作用,提出了有效解决这一问题的一种奇异电流冲激法。用这一方法求解了金属带、多棱柱的散射,表明奇异电流的贡献将大大改善散射场预测的精度,并得到奇异电流的影响程度是散射体不光滑点处内角的函数。

APPLICATION OF ON-SURFACE RADIATION BOUNDARY CONDITION TO ELECTROMAGNETIC SCATTERING BY SCATTERERS WITH NONSMOOTH SURFACE

Recently, a new technique refered to as the on-surface radiation boundary condition (OSRC) approach was presented to calculatc the electromagnetic scattering by con-vex structures. When the scatterer is with first-order surface discontinuities, the OSRC obtained by this new technique is very inaccurate. Thus there are many limitations about the applica-tion of the OSRC approach. In this paper, the OSRC approach is modified, and a method to deal with the scattering by convex two-dimensional objects with arbitrary singular edges is presented. This method is applied to calculate monostatic and bistatic rader cross-section from convex scatterers with nonsmooth surfaces. The result shows that OSRC approach greatly improves the accuracy of the scattered field prediction.