Simulated high frequency ray paths considering traveling ionospheric disturbances
Simulated high frequency ray paths considering traveling ionospheric disturbances
复制标题
考虑移动电离层扰动的模拟高频射线路径
DOI：
10.1007/s42452-020-2438-4
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发表时间：
2020
影响因子：
2.6
通讯作者：
A. Elias
中科院分区：
文献类型：
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作者：
M. Fagre;B. Zossi;J. Chum;A. Elias
这项研究提出了一个经典的三维数值射线追踪代码的修改版本[最初由琼斯和斯蒂芬森[一个多功能的电离层无线电波三维射线追踪计算机程序]。电信办公室报告75-76，美国政府印刷局，华盛顿特区，1975年)]，现在与电离层、中性大气、地球磁场和传播电离层扰动（TIDs）模型联系起来。该方法通过模拟无线电波在扰动电离层中的传播，研究了TIDs对无线电波的影响。在光线跟踪代码中实现了三维三次插值方法，以解决不连续性问题，保证光线跟踪在任何条件下的有效性和准确性。计算了不同模拟射线路径下地面距离(R)和方位角（σ）的变化。彼得森射线的情况下，也显示了信号频率的微小变化导致增强的变化。在不同背景电离层条件、发射机位置和辐射图下，研究各种辐射干扰特性的高频射线路径变化有助于减轻辐射干扰的影响，既有助于改进现有方法，也有助于开发新的方法。在这项工作中描述和实现的3-D光线跟踪代码可以很好地用于此目的。
This study presents a modified version of a classical 3-D numerical ray tracing code [originally by Jones and Stephenson (A versatile three-dimensional ray tracing computer program for radio waves in the ionosphere. Office of Telecommunications Report 75–76, US Government Printing Office, Washington, DC, 1975)], now linked to ionosphere, neutral atmosphere, Earth’s magnetic field, and traveling ionospheric disturbances (TIDs) models. This method is applied to study the effect of TIDs on radio waves by simulating the waves’ propagation in a disturbed ionosphere. A 3-D cubic interpolation method is implemented in the ray tracing code to solve discontinuities and guarantee the ray tracing validity and accuracy under all conditions. Changes of the ground range distance (R) and the bearing angle (σ) are assessed for various simulated ray paths. A Pedersen ray case is also shown, for which small changes of signal frequency lead to enhanced variations. The study of HF ray path variations in terms of various TIDs characteristics and under different background ionospheric conditions and transmitter locations and radiation pattern can contribute to the mitigation of TIDs effects, either helping to improve existing methods or to develop new ones. The 3-D ray tracing code described and implemented in this work may well work for this purpose.