基于IGES文件输入的图形电磁计算方法研究

在不同波段不同极化下,应用图形电磁计算(GRECO)法计算了某模型的高频雷达散射截面(RCS).采用计算机硬件完成遮挡计算,通过五光源分两次照射获取模型表面法矢信息.在计算镜面散射时,利用两个Sinc函数的乘积消除物理光学计算中的奇异点,棱边边缘绕射用等效电磁流法计算.最终计算结果和试验结果吻合较好,表明这种方法估算目标RCS快捷有效,可以应用于工程分析.在目标造型端添加了识别读入IGES文件的端口后,解除了对模型造型格式的严格限制,扩大了其应用范围. 

Graphical electromagnetic computing method research based on IGES files import

At different wave band and polarization, the high frequency RCS of a model was computed with the graphical electromagnetic computing (GRECO) method. The shadowed and eclipsed surfaces were identified by using the visualization hardware, and the unit normal to surfaces were got with 5 light sources through 2 times of illumination. While computing the mirror scattering RCS, 2 Sinc functions were used to avoid singular points in physical optics (PO) results and method of equivalent currents (MEC) was used to compute the reflection of the edges. The agreement of the final computation results with the experimental data indicates this method could be used to estimate the model's RCS quickly and effectively at engineering analyses. Having added the interface that can identify and read IGES files, the limit to the type of the modeling files is released and the GRECO method's application range is extended.