修正劈表示的边缘等效电磁流的改进及在电磁散射中的应用

Improved Equivalent Edge Currents by Modified Edge Representation and Their Application in EM Scattering

本文介绍了修正劈的概念和用其表示的等效边缘电磁流（EEC）公式，并应用它们计算了圆盘双站雷达散射截面（RCS）；提出一种确定修正劈方向的法则，这种法则是根据几何绕射理论（GTD）中有关参数的定义确定的，因而它不是经验的法则修正劈表示的EEC仅利用了经典的Keller锥上的绕射系数公式和修正努的概念就可得到任意入射和观察方向的EEC，它克服一般EEC在Keller锥外的方向上定义模糊的缺点数值结果不但表明本文提出确定修正劈方向的法则是正确的，而且表明修正劈表示的EEC有较高的精度和不存在任何虚假的奇异点的特点.

The concept of the modified edge and equivalent edge currents(EECs)by the modified edge representation are intreduced. and they are applied to calculate bistatic RCS of obects. A rule to determine the direction of the modified edge is presented based on the geometrical thoory of diffraction (GTD),which is not considered as an empirical one. EECs by the medified edge only use the modified edge and the classical keller's diffraction coefficients to obtain EECx out of the keller, and they overcome the ambiguity about definition of EECs at general edge points except for diffraction points. Numerical results show that the rule presented in this paper is reasonable, and that EECs by the modified edge representation posses high accuracy and do not cause additional false singularities.