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A layered fluctuation model of electron density in plasma sheath and instability effect on electromagnetic wave at Ka band

机译：等离子体鞘层电子密度的分层波动模型及其对Ka波段电磁波的不稳定性影响

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摘要

The effects of plasma sheath on communication signals are not only power attenuation but also multiplicative noise addition because of the sheath's instability. The fluctuation properties of time varying electron density are crucial to comprehensively understand the blackout problem. In this paper, the fluctuation laws of time-varying electron density are first comprehensively revealed in spacetime-frequency domain. A layered fluctuation model of time-varying electron density is then proposed based on these fluctuation laws. The effects of dynamic plasma sheath on electromagnetic (EM) waves at Ka band are calculated by Monte Carlo quasistatic EM numerical method. Results show that the amplitude and phase of time-varying transmission coefficient both follow Gaussian distribution, whereas the spectrum curves follow a bi-Gauss function because of the effect of second mode instability in the hypersonic boundary layer. Furthermore, the means of amplitudes increase with the increasing of the incident EM wave frequency and the decreasing of the peak electron density, while the standard deviations decrease with the increasing of incident EM wave frequency, the decreasing of the peak electron density and the decreasing of electron density standard deviation. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：由于鞘层的不稳定性，等离子体鞘层对通信信号的影响不仅是功率衰减，而且是乘法噪声的增加。时变电子密度的波动特性对于全面理解停电问题至关重要。本文首先在时空-频域上全面揭示了随时间变化的电子密度的波动规律。根据这些波动规律，提出了时变电子密度的分层波动模型。用蒙特卡罗准静态EM数值方法计算了动态等离子体鞘层对Ka波段电磁波的影响。结果表明，时变传输系数的幅度和相位均服从高斯分布，而频谱曲线遵循双高斯函数，这是由于高超声速边界层中第二模式不稳定性的影响。此外，振幅的平均值随着入射电磁波频率的增加和峰值电子密度的降低而增加，而标准偏差随入射电磁波频率的增加，峰值电子密度的降低和电子密度的降低而减小。电子密度标准偏差。 （C）2018 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2018年第7期|480-487|共8页
  • 作者

    Yao Bo; Li Xiaoping; Shi Lei; Liu Yanming; Bai Bowen;

  • 作者单位

    Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China;

    Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China;

    Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China;

    Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China;

    Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Plasma sheath; Electron density; Fluctuation; EM wave; Ka band;

    机译：等离子体鞘;电子密度;波动;EM波;Ka带;

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