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. To calculate the Radar Cross Section (RCS) of complex targets by physical optics, the occlusions between the elements are determined by the overlap of the elements along the incident direction of the electromagnetic wave and the depth of field. The projection of the elements onto the Radar Cross Section Vertical plane grouping, so that the distance between the same group of bins in the same panel only in the calculation of the block to determine the relationship between the occlusion to avoid the face of all the two to determine, so as to save the calculation time, and grouping And the computation time is minimized.Examples show that the occlusion detection method based on face-grouping is feasible and can greatly improve the computational efficiency.