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中文摘要：
提出一种针对联合积分方程（CFIE）的对称稀疏近似逆（S-SAI）预处理技术.将联合积分方程中的非对称矩阵改造成对称矩阵,使用Cholesky分解构造出联合积分方程的对称SAI（S-SAI）预处理器.数值实验结果表明,S-SAI预处理器的收敛性能与非对称SAI（A-SAI）相似,但是其构造时间比A-SAI的快32倍.
英文摘要：
A symmetric sparse approximate inverse（S-SAI） preconditioners for the combined field integral equation（CFIE） is presented in this paper.The asymmetric matrix arising from the CFIE is transformed into a symmetric one,which is employed for efficiently constructing preconditioner by the Cholesky factorization.Numerical experiments show that this S-SAI preconditioner has similar convergent behavior to the previous asymmetric sparse approximate inverse（A-SAI） one,but the construction time of it can be cut down by a factor of at least 32 than that of A-SAI.
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