不同极化方式下复杂目标高频区的RCS计算  

Computing the RCS of complex targets in high-frequency region for different polarizable modes

作　　者：匡磊[1] 吴先良[1] 

机构地区：[1]安徽大学电子工程与信息科学系,安徽合肥230039

出　　处：《安徽大学学报（自然科学版）》2004年第3期43-49,共7页Journal of Anhui University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60371041);安徽省教育厅重点科研基金资助项目(2002kj32)

摘　　要：通过图形电磁计算(GRECO)方法,利用在安装了高性能的图形加速卡的微机上实时计算复杂目标的高频雷达散射截面(RCS),目标用非均匀有理B样条(NURBS)进行样条模拟,由图形加速卡完成消隐和遮挡运算,利用Phong光照模型着色渲染目标可见表面,运用物理光学(PO),等效电磁流法(MEC),增量长度绕射系数法(ILDC)和物理绕射理论(PTD)计算目标高频区的雷达散射截面。根据极化之间的转换关系分析了线极化和圆极化下的雷达散射截面。计算结果与理论值进行比较,效果令人满意。This paper presents a approach called 'Graphical Electromagnetic Computing(GRECO)' to compute the radar cross section(RCS) of complex targets in high-frequency region and real time, by means of a 3D graphic hardware accelerator. The targets are modeled with NURBS and the image of the targets are rendered and displayed on the screen. The high-frequency RCS is obtained through Physical Optics(PO),Method of Equivalent Currents(MEC) and Physical Theory of Diffraction(PTD) respectively and is analyzed under the linear polarization and circular polarization modes. Good argument has been found between the results calculated with this present approach and the theoretical ones.

关 键 词：极化方式 电磁散射 雷达散射截面 图形电磁计算 圆极化 RCS 物理绕射理论 

分 类 号：TN957[电子电信—信号与信息处理] TN971.1[电子电信—信息与通信工程]