飞机基本构件电磁散射的FD-TD方法  

Analysis of Electromagnetic Scattering Problems of Aerocraft Basic Parts with FD-TD Method

作　　者：易春海[1] 王晟达[1] 黄仕家[1] 张智军[1] 

机构地区：[1]空军工程大学工程学院,陕西西安710038

出　　处：《空军工程大学学报（自然科学版）》2003年第3期16-19,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：军队科研基金资助项目

摘　　要：采用电磁工作者广为关注的FD-TD方法,对飞机的基本构成部件(方柱、圆柱、平板)的电磁散射问题,进行了研究。采用矩形网格及合适的吸收边界与连接边界,导出了基本部件某一封闭面上散射场的FD-TD计算公式;采用频域Love等效原理,实现了近场-远场变换,大大减少了计算量,所得散射截面(RCS)与实测或其它方法计算结果相比,吻合较好。本方法与高频近似方法———GTD相比,避免了多径绕射及高次绕射的射线寻迹困难,与频域方法相比,它可解决超宽带电磁散射预测问题。In this paper the widely concerned FD-TD method is employed in analyzing Electromagnetic scattering problems of aerocraft basic parts(square cylinder? circle cylinder?flat board). Rectangular mesh? effective absorbing boundary conditions and connecting conditions are used and equation of scattering data on the virtual surface which fully encloses the scatterer are obtainedAt the same time Love equivalent principle is applied to the transforming from near zone to far zone in the frequency domain, which saves much time in computing radar cross section(RCS) . And good agreement is observed between the numerical and the measured or other computed results. The method introduced in the paper helps avoid the trouble in finding the rays of diffractions and multiple reflections as compared with the high-frequency approximation--GTD and shows much better effect in solving the EM scattering problems of ultra wide band(UWB) than the methods used in frequency domain.

关 键 词：电磁散射 FD—TD 超宽带 

分 类 号：V243[航空宇航科学与技术—飞行器设计]