Estimation of parameters of ionospheric wave disturbances on the basis of measurements of the Doppler shift of signal frequency of low-orbiting satellites

T. V. Chmyga, V. F. Pushin, O. F. Tyrnov, O. V. Alexanova
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Abstract

[1] Calculations of the Doppler shift of the frequency (DSF) of a UHF signal under given models of a wave disturbance (WD), undisturbed medium, and particular orbits of low-orbiting (LO) satellites showed that there is an angle-of-approach effect. On the basis of the angle-of-approach effect a method of estimation of model parameters of medium-scale WD on the basis of measurements of DSF of signals from LO satellites in one observation point is developed. A trend in DSF variations is detected in the initial time series. Using this trend, the global model of the undisturbed ionosphere is corrected. For the parameters estimation, calculated trajectory parameters of the satellite and recordings of DSF variations are used. The numerical experiment carried out demonstrates the efficiency of the method developed. The method was tested at a series of DSF registrations received from LO satellites of the Tsykada type in 2002–2004. The analysis of DSF registrations showed that at high zenith angles for the orbits close to the central ones, WD disturbances with a vertical component are often observed. In such cases, the vertical wavelength can reach 140 km. For horizontal WD, the estimates of the wavelength give values >100 km. The range of variations of the maximum relative disturbance of the electron concentration is 1–7%.
基于低轨道卫星信号频率多普勒频移测量的电离层波扰动参数估算
在给定的波扰动(WD)模型、未扰动介质模型和低轨道卫星的特定轨道模型下,对超高频信号的频率多普勒频移(DSF)的计算表明,存在进近角效应。在接近角效应的基础上,提出了一种基于LO卫星单观测点信号DSF值估算中尺度WD模式参数的方法。在初始时间序列中检测到DSF变化的趋势。利用这一趋势,对未受干扰电离层的全球模型进行了修正。在参数估计中,采用了计算得到的卫星轨迹参数和DSF变化记录。数值实验证明了该方法的有效性。该方法在2002-2004年从Tsykada型LO卫星接收的一系列DSF配准中进行了测试。DSF配准分析表明,在靠近中心轨道的高天顶角处,经常观测到具有垂直分量的WD扰动。在这种情况下,垂直波长可以达到140公里。对于水平WD,波长的估计值为100 ~ 100 km。电子浓度的最大相对扰动变化范围为1 ~ 7%。
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