高阶叠层渐近相位基函数结合快速多级子分析电大物体散射特性

Analysis on electromagnetic scattering features of big objects in combination with MLFMA and higher-order hierarchical asymptotic phase basis functions

由入射波与面电流的关系,引出了渐近相位(AP)在高阶叠层基函数(HO-RWG)中的应用,并运用到矩量法(MOM)中,与快速多级子方法(MLFMA)结合,分析了电大尺寸复杂目标的电磁散射特性。与高阶叠层基函数和零阶相位基函数(AP-CRWG)相比,在相同的计算精度下,都可以大大减少未知量数量,从而可以节省大量内存和计算时间。计算实例表明,该方法有较高的精确性和有效性。

In this paper,since the relations of the incident wave and surfacecurrent,the application of asymptotic phase （AP）in the higherorder hierarchical basis functions（HORWG）is derived,and applied in method of moment（MOM）. The electromagnetic scattering features of electricallarge targets are analysed in combination with multilevel fast multipole algorithm （MLFMA）. Compared with the higherorder hierarchical basis functions and zeroorder phase basis functions（AP-CRWG）,the unknown quantity in this method can be cut off more in the same computational precision Thereby,much of memory and time can be saved. Numerical examples in radar cross section calculation demonstrate the accuracy and efficiency of the proposed method.