一种电大尺寸深腔散射的有效计算方法

Effective method for RCS computation of large and deep cavities

针对电大尺寸深腔散射计算需求过高的问题,提出了一种基于有限元—边界积分(FE-BI)法的有效计算方法.该方法利用FE-BI法计算腔体散射时矩阵元素及激励向量的特点,基于广义高斯消去法的思想,将腔体沿纵深方向划分为若干层,逐层推进计算.计算所需最大内存仅与腔体的横截面尺寸相关,而与腔体的深度无关.通过进一步挖掘算法的特点,优化层间传递方案和矩阵计算,显著提高了算法的计算效率.数值实验结果表明,该方法能够快速准确地实现深腔体的RCS计算.

To reduce the too high requirements when the RCS of electrically large and deep cavity is computed,an effective method based on the Finite Element-Boundary Integration（FE-BI） technique is presented.By utilizing the unique features of the matrix elements and excited vectors when the FE-BI technique is utilized to compute the cavity scattering,and introducing the idea of generalized Gaussian elimination,we can divide the deep cavity into some layers along its depth and perform the calculation layer by layer.The required maximum memory is dependent only on the cavity cross section size and independent of its depth.By fully exploiting the characteristics of the presented method,the delivering scheme between adjoined layers and matrix operations can be optimized,and then the computational efficiency is improved significantly.Numerical results show that the presented method can realize the RCS computation of deep cavities fast and accurately.