复杂目标RCS可视化电磁计算方法的改进

复杂目标的电磁散射主要来源于面元及棱边,在照明区与阴影区交界处,相位出现快速变化,给图形电磁计算带来计算误差。棱边散射场计算中,单站增量长度绕射系数较简单,计算精度低。文章在不改变反射系数情况下,使用驻相法消除奇变效应。提出将等效电流绕射系数、物理光学绕射系数及并矢绕射系数,应用于棱边散射场图形电磁计算。从而提高了RCS计算精度。该方法对我国的隐身与反隐身技术及仿真技术的研究,具有重要的实用价值。

Improvement in the method for the RCS graphical electromagnetic computation of the complex target

The scattering field of the complex target can be attributed to the combination of the surface and edge, and on the bordering area of illumination and shadow,fast changing phase will cause computing error,and the simple incremental length diffraction coefficients(ILDC) result in low precision. In this paper,the stationary phase method is used to avoid the calculating error of the interface between the illuminated region and the shadow region,and the electrical current diffraction coefficients,physical optics diffraction coefficients and dyadic diffraction coefficients are applied to the graphical electromagnetic computing of the scattering field of edge,and the calculation precision is improved. The presented method is helpful and valuable to the study of stealth/antistealth or simulation technology in China.