自由电子密度对等离子体隐身的影响  

Research on the Relation between the Free Electron Density in a Unmagnetized Plasma and the Stealth of Target

作　　者：詹康生[1] 胡萍[2] 刘少斌[3] 

机构地区：[1]广州大学物理与电子工程学院,广东广州510006 [2]南昌大学数理学院,江西南昌330029 [3]南昌大学基础部,江西南昌330029

出　　处：《石河子大学学报（自然科学版）》2005年第4期405-408,共4页Journal of Shihezi University(Natural Science)

摘　　要：本文研究了不均匀非磁化等离子体片的自由电子密度与目标隐身的关系,给出不同等离子体自由电子密度分布时,对不同频段的雷达电磁波的衰减。研究发现,等离子体的自由电子密度应与雷达频率相关。雷达在高频、甚高频等低频段工作时,等离子体隐身的效果不理想;雷达工作在L、S、C、X等高频频段时,等离子体隐身效果显著。此外,我们发现对不同的雷达频率,等离子体存在一个最佳碰撞频率使入射电磁波衰减最大,该频率接近入射电磁波的频率。The relation between the free electron density in a unmagnetized plasma and the stealth of target is investigated in this paper. For different plasma- density profiles, the reduction of electromagnetic waves with different frequencies is given. The results illustrate that the free electron density must relate to the electromagnetic wave frequency. The plasma system isn＇ t successful when the EM wave frequency is low. And it is efficient when the EM wave frequency is large. Meanwhile, we discover that there is a best collision frequency for a given EM wave frequency. The absorption reaches a peak at the collision frequency. The collision frequency is near the EM wave frequency.

关 键 词：等离子体隐身 雷达散射截面 不均匀等离子体 电磁波 

分 类 号：O531[理学—等离子体物理]