基于改进的图形电磁学法的近场RCS计算

An Improved GRECO Method for the Computation of Radar Cross Section in Near Field

对近场RCS图形电磁学计算公式进行了推导,以现有远场GRECO法为基础,通过将OpenGL中的光源设置为位置性光源,同时对目标体进行二次光照,每次光照设置不同的衰减系数,从而得到准确的光照区域和面元与点源之间的距离。最后,以标准目标体平板、球体等模型在不同距离下的雷达散射截面的计算为例,验证了该方法的有效性和准确性。

In this paper,an improved GRECO method applying to near field is proposed,the formula of the near field GRECO method is deduced.Based on the formula and the available GRECO method,the improved GRECO method sets the light model to position lighting in the OpenGL.By the setting,the illuminated region changed with the distance between source and target is obtained.Meanwhile,the distance between the source and the element of surface is obtained by two times lighting with different coefficients of the attenuation factor.Numerical results for a square plate,a sphere,and a decoy are presented to demonstrate the efficiency and accuracy of this calculation method in the near field.