等离子体覆盖立方散射体目标雷达散射截面的时域有限差分法分析  

Finite-difference time-domain analysis on radar cross section of conducting cube scatterer covered with plasmas

作　　者：刘少斌[1] 张光甫[1] 袁乃昌[1] 

机构地区：[1]国防科技大学电子科学与工程学院

出　　处：《物理学报》2004年第8期2633-2637,共5页Acta Physica Sinica

基　　金：国家高技术研究发展计划 (批准号 :2 0 0 2AA73 1181);国防科技重点实验室基金 (批准号 :5 14 83 0 10 3 0 1KG0 10 2 )资助的课题~~

摘　　要：采用分段线性电流密度递归卷积时域有限差分 (PLJERC FDTD)算法计算了均匀非磁化等离子体覆盖三维立方体目标的散射特性 .分析了等离子体厚度、密度和碰撞频率对雷达散射截面 (RCS)的影响 .计算结果表明 :等离子体包层能有效地减小雷达目标的RCS ,当等离子体频率比入射电磁波频率小得多时 ,主要靠增大等离子体的厚度使立方散射体目标的RCS值减小 ,增大等离子体碰撞频率对立方散射体目标的RCS值影响不大 ;当等离子体频率约为入射电磁波频率的一半时 ,增大等离子体厚度和碰撞频率都对立方散射体目标的RCS值减小有影响 ;当等离子体频率接近电磁波频率时 。A PLJERC FDTD algorithm is applied to the study of the scattering of perfectly conducting cube covered with homogeneous isotropic plasmas. The effects of plasma thickness, density and collision frequency on the radar cross section(RCS) of the conducting cube scatterer have been obtained. The results illustrate that the plasma cloaking can greatly reduce the RCS of radar targets, and the RCS of the perfectly conducting cube scatterer decreases with increasing plasma thickness when the plasma frequency is greatly less than the electromagnetic(EM) wave frequency; the RCS of the perfectly conducting cube scatterer decreases with increasing plasma thickness and plasma collision frequency when the plasma frequency is almost half as much as the EM wave frequency; the effects of plasma thickness and collision frequency on the RCS of the perfectly conducting cube scatterer is small when the plasma frequency is close to the EM wave frequency.

关 键 词：等离子体隐身 雷达散射截面 电磁波 时域有限差分算法 PLJERC-FDTD 碰撞频率 

分 类 号：O539[理学—等离子体物理]