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Multiple Phase Screen Modeling of HF Wave Field Scintillations Caused by the Irregularities in Inhomogeneous Media
Radio Science ( IF 1.6 ) Pub Date : 2021-04-11 , DOI: 10.1029/2020rs007239
Mingkai Ding 1, 2 , Peng Tong 1, 2 , Yinsheng Wei 1, 2 , Lei Yu 1, 2
Affiliation  

High frequency (HF) radio waves propagating through regions of ionospheric plasma irregularities exhibit random fluctuations in both amplitude and phase referred to as scintillations, which heavily influences the detection performance of HF sky‐wave radar and hybrid sky‐surface wave radar systems. In this paper, a numerical multiple phase screen model for HF sky‐wave propagation is developed, which can simulate the HF wave field scintillations caused by the irregularities in inhomogeneous media. In this model, the random phase changes due to irregularities and the diffraction effect due to phase mixing are considered separately and computed sequentially, where the phase change is numerically calculated using a geometric optical phase delay to allow for the consideration of horizontal electron density gradients. Utilizing the proposed model, we first simulate the observations of scintillation from the direct wave of the HF hybrid sky‐surface wave radar. The statistics of simulation and measured data, including power spectrum and scintillation indices on amplitude and phase, are considered to verify the effectiveness of the proposed model. Then, we analyze the effects of traveling ionospheric disturbances (TIDs) on the intensity of scintillation. The simulation indicates that the horizontal electron density gradients due to TIDs cause the fluctuation of the amplitude scintillation index urn:x-wiley:00486604:media:rds21014:rds21014-math-0001.

中文翻译:

非均匀介质中不规则性引起的HF波场闪烁的多相屏幕建模

穿过电离层等离子体不规则区域传播的高频(HF)无线电波在振幅和相位上均表现出随机波动,称为闪烁,这严重影响了HF天波雷达和混合天地波雷达系统的检测性能。本文建立了一个数值多相屏蔽的高频天波传播模型,该模型可以模拟非均匀介质中的不规则性引起的高频波场闪烁。在该模型中,分别考虑并依次计算由于不规则而引起的随机相位变化和由于相位混合而产生的衍射效应,其中使用几何光学相位延迟在数值上计算相位变化,以考虑水平电子密度梯度。利用建议的模型,我们首先从HF混合天地波雷达的直接波中模拟闪烁的观测。仿真统计数据和测量数据,包括功率谱和幅度和相位的闪烁指数,被认为可以验证所提出模型的有效性。然后,我们分析了电离层干扰(TID)对闪烁强度的影响。仿真表明,由TID引起的水平电子密度梯度引起幅度闪烁指数的波动。我们分析了电离层干扰(TID)对闪烁强度的影响。仿真表明,由TID引起的水平电子密度梯度引起幅度闪烁指数的波动。我们分析了电离层干扰(TID)对闪烁强度的影响。仿真表明,由TID引起的水平电子密度梯度引起幅度闪烁指数的波动。缸:x-wiley:00486604:media:rds21014:rds21014-math-0001
更新日期:2021-04-22
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