一种应用于目标宽带RCS快速计算的高效预处理技术
doi: 10.3724/SP.J.1146.2010.00756
A High Efficient Preconditioning Technique Applied to the Fast Calculation of Wide-band RCS of Objects
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摘要: 矩量法常与渐近波形估计技术结合用于目标宽带雷达散射截面的快速计算，然而当目标为电大尺寸时，此种方法仍然十分耗时。该文使用一种基于可变内外迭代技术的Krylov子空间迭代法FBICGSTAB求解由电场积分方程离散得到的大型稠密矩阵方程。同时近场矩阵预处理技术将与双阈值不完全LU分解预处理技术结合用于降低FBICGSTAB的迭代求解次数。数值计算表明：在不影响精度的前提下，该文方法可以大大提高目标宽带雷达散射截面的计算效率。Abstract: The Asymptotic Waveform Evaluation (AWE) technique combined with the Method of Moments (MoM) is often applied to accelerate the calculation of the wide-band Radar Cross Section (RCS) of the target. However, when the object is electrically large, the method is still quite time-consuming. Hence, in this paper, a new type of Krylov subspace iterative methods based on flexible inner-outer iterative technique is adopted to solve the large dense matrix equation arising from the discretization of the Electric Field Integral Equation (EFIE). Near-field matrix preconditioning technique combined with the dual threshold incomplete LU factorization preconditioning technique will be applied to the reduction of the iterative number of FBICGSTAB. The numerical results show that the computational efficiency of the wide-band RCS for electrically large objects is improved significantly by using the method presented in this paper without sacrificing much accuracy.
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