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Explore the Echo Characteristics of HF Radar in Artificial Disturbance Ionosphere Using Ray-Tracing Technology
Radio Science ( IF 1.6 ) Pub Date : 2021-06-29 , DOI: 10.1029/2021rs007276
Y. G. Hu 1 , X. L. Zhu 1 , C. H. Jiang 1 , Z. Y. Zhao 1 , Y. N. Zhang 1
Affiliation  

Artificial ionospheric hole created by the release of neutral gases (such as sulfur hexafluoride) has a significant impact on the propagation of radio waves. Based on the ray-tracing method, the propagation patterns of HF radio waves in the ionospheric hole and the characteristics of its echoes are discussed in this paper. The results show that the HF waves will be deflected and bended while passing through the ionospheric hole, thus changing its original path. The sounding frequency, elevation angle, position of transmitter and receiver, and the dynamic variation of the hole all affect the reception of echoes. Generally, when the frequency is low, the echoes received on the ground mainly come from rays with low-elevation angles, and the multi-hop rays are more likely to occur. While with a high frequency, the received echoes are mainly contributed by high-elevation rays. It is not conducive to the reception of the echoes if the transmitter and receiver is too far away from the hole. Single-peak, double-peak and multi-peak echo signals can be found in the group path-amplitude diagram, and the maximum group path difference can reflect the size of the ionospheric hole to some extent. Due to the dynamic evolution of the hole, the propagation of HF waves and received echoes also changes over time. The group path-time diagrams show that the come-back echoes mainly appear in the period of 20–100 s after release. The results of this paper have a guiding significance for the diagnosis and application of active experiments.

中文翻译:

使用射线追踪技术探索人工扰动电离层中高频雷达的回波特性

中性气体(如六氟化硫)释放产生的人工电离层空洞对无线电波的传播有重大影响。本文基于射线追踪方法,讨论了电离层空洞中高频无线电波的传播模式及其回波特征。结果表明,高频波在穿过电离层孔时会发生偏转和弯曲,从而改变其原来的路径。探测频率、仰角、发射器和接收器的位置以及孔的动态变化都会影响回波的接收。一般在频率较低时,地面接收到的回波主要来自低仰角的射线,更容易出现多跳射线。在高频的同时,接收到的回波主要由高海拔射线贡献。发射机和接收机距离孔太远不利于回波的接收。群径幅图中可以发现单峰、双峰和多峰回波信号,最大群径差可以在一定程度上反映电离层孔洞的大小。由于孔洞的动态演化,HF 波的传播和接收到的回波也会随时间发生变化。群路径-时间图表明,返回回波主要出现在释放后20-100 s的时间段内。本文研究结果对主动实验的诊断和应用具有指导意义。发射机和接收机距离孔太远不利于回波的接收。在群径幅图中可以发现单峰、双峰和多峰回波信号,最大群径差可以在一定程度上反映电离层孔洞的大小。由于孔洞的动态演化,HF 波的传播和接收到的回波也会随时间发生变化。群路径-时间图表明,返回回波主要出现在释放后20-100 s的时间段内。本文研究结果对主动实验的诊断和应用具有指导意义。发射机和接收机距离孔太远不利于回波的接收。群径幅图中可以发现单峰、双峰和多峰回波信号,最大群径差可以在一定程度上反映电离层孔洞的大小。由于孔洞的动态演化,HF 波的传播和接收到的回波也会随时间发生变化。群路径-时间图表明,返回回波主要出现在释放后20-100 s的时间段内。本文研究结果对主动实验的诊断和应用具有指导意义。由于孔洞的动态演化,HF 波的传播和接收到的回波也会随时间发生变化。群路径-时间图表明,返回回波主要出现在释放后20-100 s的时间段内。本文研究结果对主动实验的诊断和应用具有指导意义。由于孔洞的动态演化,HF 波的传播和接收到的回波也会随时间发生变化。群路径-时间图表明,返回回波主要出现在释放后20-100 s的时间段内。本文研究结果对主动实验的诊断和应用具有指导意义。
更新日期:2021-07-13
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