基于面元分组的电磁遮挡算法及其优化

Electromagnetic occultation algorithm based on facets grouping and optimization

用物理光学法计算复杂目标的雷达散射截面(RCS,Radar Cross Section)时,通过面元沿电磁波入射方向的重叠关系和景深来判断面元之间的遮挡.将面元投影在与电磁波入射方向垂直的平面上进行分组,使同组的面元距离相近.在计算中只需对同组的面元判断遮挡关系,避免了所有面元的两两遮挡判断,从而节省计算时间,并对分组进行了优化,使计算时间最少.算例表明,基于面元分组的遮挡判断方法可行,能够大大提高计算效率.

When calculating complex target＇s radar cross section（RCS） with physical optics（PO） method, the facets shadowing relationship was judged through overlapping and depth-of-view of facets along the incident wave direction. The facets were projected on the plane that was perpendicular with the incident wave direction and then grouped to several groups to make sure that the distance of facets in the same group were close. Only the facets in the same group needed to be judged whether they are shadowed or not instead of making the judgement between all of the facets thus the calculating time was saved. The grouping size was optimized to make the the calculating time be the least. The calculating examples showed that this method is feasible and can make the calculating more efficient.