电大尺寸散射体的RCS计算方法研究

Research on RCS computation method of large scattering object by MLFMA

为了更加有效的求解电大目标散射计算问题,在避免谐振区效应情况下获得复杂目标的隐身雷达散射截面(RCS)特性,引用混合场积分方程(CFIE),在快速算法的求解迭代过程中采用共轭梯度算法(CG)的收敛技术,能够稳定的求解电大尺寸的RCS。计算和分析了金属球双站RCS和金属立方体双站RCS,并和精确计算、相关参考文献进行了比较,证明了方法的正确性,计算结果稳定,在工程实际上有较大的应用价值。

Multilevel Fast Multipole Algorithm （MLFMA） was explained and used for computing the RCS scattering form large objects efficiently. This paper adopted Combined Field Integral Equation （CFIE） to avoid the effect of resonance region and get the complicated objects RCS characteristic. During the iterative solution procedure of fast algorithm, convergent technique of Conjugate Grads （CG） could be used to calculate the RCS of large objects stably. Compared with the exact calculation and reference, the result on the RCS of bistate radar for metal globe and metal cube proves that this method is correct and its result is stable and it can be applied in the practical project.