采用矩量法(MoM)计算电大尺寸的复合目标的电磁散射。为了能够高效快速地计算电大尺寸三维复合目标的电磁散射, 提出一种新的混合方法, 将自适应交叉近似(ACA)算法和多层快速多级子(MLFMA)算法相结合, 共同加速矩量法的计算。其中, MLFMA用于加速目标与自身的作用, ACA用于加速目标与其他目标的相互作用。提出的混合算法在计算复合目标电磁散射时, 可降低运算存储, 缩短阻抗矩阵填充时间, 并且能够加快矩阵矢量乘, 且不影响计算精确度。数值算例表明, 所提快速算法能够在保证电磁散射计算精确度前提下, 比传统方法更高效。

The electromagnetic scattering of composite objects with large size is calculated by the Method of Moments(MoM). In order to calculate the electric scattering of the electric three-dimensional composite target efficiently and quickly, a new method is proposed, which combines the Adaptive Cross Approximation(ACA) algorithm and the Multi-Level Fast Multi-pole Algorithm(MLFMA) to accelerate the MoM. Among them, MLFMA is utilized to accelerate the self-interaction of objects; ACA is utilized to accelerate the coupling interaction between the object and other targets. The hybrid algorithm proposed in this paper can reduce the computational memory, reduce the filling time of the impedance matrix, and accelerate the matrix vector multiplication without affecting the accuracy of the calculation when calculating the composite target electromagnetic scattering. Numerical examples show that the proposed fast algorithm can be more efficient than the traditional method under the premise of ensuring the accuracy of electromagnetic scattering calculation.