【摘要】 针对电大尺寸天线罩电磁特性,分析研究了快速求解表面积分方程的多层快速多极子算法及其改进技术。构造了具有良好矩阵性态的积分方程形式,提出加速迭代求解的并行预条件技术,利用分组稀疏化方式构造预条件矩阵,显著降低了迭代求解次数。采用快速球谐展开技术对聚合和配置因子项进行压缩,将其存储量降低了2/3。通过数值算例验证了方法的精确性和高效性,并实现了大型带罩阵列天线辐射特性的仿真分析。更多还原

【Abstract】 Aiming at the analysis of electromagnetic characteristics of electrically large radome,the multilevel fast multipole algorithm(MLFMA) and its improved technology for the fast solution of surface integral equation are studied. The integral equation form with good matrix properties is constructed,and the parallel preconditioning technology to accelerate iterative solution is proposed,and the preconditioning matrix is constructed by grouping sparse method,which significantly reduces the number of iterations. Fast spherical harmonic expansion technique is applied to compress the aggregation and disaggregation items,which reduces the storage by 2/3 of this part. Numerical examples are used to verify the accuracy and efficiency of the method,and the simulation analysis of the radiation characteristics of the large array antenna with hood is realized.更多还原