Interaction between relative moving plasma plate and electromagnetic wave
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摘要: 高超声速飞行器在飞行过程中，由于高温高压的作用，会在飞行器表面形成一层等离子体鞘层，飞行器及其等离子体鞘层相对于地面测控中心做高速相对运动，对目标物电磁回波会带来严重影响. 此外，等离子体鞘层的时变特性，也会对目标物雷达回波进行调制，使测控中心难以识别、跟踪目标. 本文利用Lorentz-FDTD方法研究了相对运动等离子体鞘层与电磁波之间的相互作用，并分析了等离子体鞘层的相对运动特性和时变特性对电磁波造成的影响，发现运动的时变等离子体除了对电磁波造成多普勒频移外，还会对入射波频谱进行调制.Abstract: During the flight of hypersonic aircraft, due to the impact of high temperature and high pressure, a layer of plasma sheath is formed on the surface of the aircraft. With the aircraft and its plasma sheath moving at high speed relative to the ground measurement and control center, a serious impact on the electromagnetic echo of the target will be caused. In addition, the time-varying characteristics of plasma sheath also modulate the radar echo of the target, making it difficult for the center to identify and track the target. In this paper, Lorentz-FDTD method is used to study the interaction between the relatively moving plasma sheath and the electromagnetic wave, and the influence of the relative motion and time-varying characteristics of the plasma sheath on the electromagnetic wave is analyzed. It is found that the moving time-varying plasma not only causes doppler shift to the electromagnetic wave but also modulates the spectrum of incident wave.
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Key words:
- FDTD /
- Lorentz transformation /
- relative motion /
- time varying plasma
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图 1 Lorentz-FDTD算法计算运动目标电磁问题流程图
Fig. 1 Flowchart of Lorentz-FDTD algorithm for electromagnetic problems of moving targets
图 2 电磁波与相对运动等离子体相互作用一维仿真模型
Fig. 2 One-dimensional simulation model of interaction between electromagnetic wave and relative moving plasma
图 3 不同运动速度下的相对运动等离子体层反射波频谱
Fig. 3 Spectrum of reflected waves in relative moving plasma layer at different velocities
图 4 不同电子密度下的相对运动等离子体层反射波频谱
Fig. 4 Spectrum of reflected waves in relative motion plasma layer at different electron densities
图 5 不同碰撞频率下的等离子体层反射波频谱
Fig. 5 Spectrum of reflected waves in plasma layer at different collision frequencies
图 6 不同厚度下的运动等离子体层反射波频谱
Fig. 6 Spectrum of reflected waves in moving plasma layer with different thicknesses
图 7 时变运动等离子体电子密度随时间变化
Fig. 7 Variation of electron density of time-varying moving plasma vs. time
图 8 周期时变运动等离子体反射的电磁波包络图
Fig. 8 Envelope diagram of electromagnetic wave reflected from periodically time-varying moving plasma
图 9 不同运动速度的时变运动等离子体反射电磁波频谱
Fig. 9 The electromagnetic spectrum reflected by time-varying moving plasma at different velocities
图 10 非均匀时变等离子体电子密度分布
Fig. 10 Electron density distribution in inhomogeneous time-varying plasma
图 11 d=0.1 m处电子密度随时间变化曲线(a)和时间t=250 ns时，电子密度随空间的变化曲线(b)
Fig. 11 (a) The Curve of electron density vs time at D =0.1m; (b) The curve of electron density vs space at time t=250ns
图 12 非周期时变运动等离子体反射的电磁波包络图
Fig. 12 Envelope diagram of electromagnetic wave reflected from aperiodically time-varying moving plasma
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