Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

doi:10.1088/1674-1056/25/2/024101

中国物理B ›› 2016, Vol. 25 ›› Issue (2): 24101-024101.doi: 10.1088/1674-1056/25/2/024101

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

Zheng Sun(孙正), Hui Ning(宁辉), Jing Tang(唐敬), Yong-Jie Xie(谢永杰), Peng-Fei Shi(石鹏飞), Jian-Hua Wang(王建华), Ke Wang(王柯)

Northwest Institute of Nuclear Technology, Xi'an 710024, China

收稿日期:2015-06-19 修回日期:2015-08-21 出版日期:2016-02-05 发布日期:2016-02-05
通讯作者: Zheng Sun E-mail:snzhg@mail.ustc.edu.cn

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

Zheng Sun(孙正), Hui Ning(宁辉), Jing Tang(唐敬), Yong-Jie Xie(谢永杰), Peng-Fei Shi(石鹏飞), Jian-Hua Wang(王建华), Ke Wang(王柯)

Northwest Institute of Nuclear Technology, Xi'an 710024, China

Received:2015-06-19 Revised:2015-08-21 Online:2016-02-05 Published:2016-02-05
Contact: Zheng Sun E-mail:snzhg@mail.ustc.edu.cn

摘要/Abstract

摘要： Atmospheric duct is a common phenomenon over large bodies of water, and it can significantly affect the performance of many radio systems. In this paper, a two-month (in July and August, 2014) sounding experiment in ducting conditions over Bosten Lake was carried out at a littoral station (41.89° N, 87.22° E) with high resolution GPS radiosondes, and atmospheric ducts were observed for the first time in this area. During the two months, surface and surface-based ducts occurred frequently over the Lake. Strong diurnal variations in ducting characteristics were noticed in clear days. Ducting occurrence was found at its lowest in the early morning and at its highest (nearly 100%) in the afternoon. Duct strength was found increasing from early morning to forenoon, and reaching its maximum in the afternoon. But contrarily, duct altitude experienced a decrease in a clear day. Then the meteorological reasons for the variations were discussed in detail, turbulent bursting was a possible reason for the duct formation in the early morning and the prevailing lake-breeze front was the main reason in the afternoon. The propagation of electromagnetic wave in a ducting environment was also investigated. A ray-tracing framework based on Runge-Kutta method was proposed to assess the performance of radio systems, and the precise critical angle and grazing angle derived from the ray-tracing equations were provided. Finally, numerical investigations on the radar performance in the observed ducting environments have been carried out with high accuracy, which demonstrated that atmospheric ducts had made great impacts on the performance of radio systems. The range/height errors for radar measurement induced by refraction have also been presented, too, which shows that the height errors were very large for trapped rays when the total range was long enough.

关键词: Bosten Lake, atmospheric duct, diurnal ducting variation, ray-tracing equations

Abstract: Atmospheric duct is a common phenomenon over large bodies of water, and it can significantly affect the performance of many radio systems. In this paper, a two-month (in July and August, 2014) sounding experiment in ducting conditions over Bosten Lake was carried out at a littoral station (41.89° N, 87.22° E) with high resolution GPS radiosondes, and atmospheric ducts were observed for the first time in this area. During the two months, surface and surface-based ducts occurred frequently over the Lake. Strong diurnal variations in ducting characteristics were noticed in clear days. Ducting occurrence was found at its lowest in the early morning and at its highest (nearly 100%) in the afternoon. Duct strength was found increasing from early morning to forenoon, and reaching its maximum in the afternoon. But contrarily, duct altitude experienced a decrease in a clear day. Then the meteorological reasons for the variations were discussed in detail, turbulent bursting was a possible reason for the duct formation in the early morning and the prevailing lake-breeze front was the main reason in the afternoon. The propagation of electromagnetic wave in a ducting environment was also investigated. A ray-tracing framework based on Runge-Kutta method was proposed to assess the performance of radio systems, and the precise critical angle and grazing angle derived from the ray-tracing equations were provided. Finally, numerical investigations on the radar performance in the observed ducting environments have been carried out with high accuracy, which demonstrated that atmospheric ducts had made great impacts on the performance of radio systems. The range/height errors for radar measurement induced by refraction have also been presented, too, which shows that the height errors were very large for trapped rays when the total range was long enough.

Key words: Bosten Lake, atmospheric duct, diurnal ducting variation, ray-tracing equations

中图分类号: (Electromagnetic wave propagation; radiowave propagation)

41.20.Jb

92.60.Ta (Electromagnetic wave propagation) 42.15.Dp (Wave fronts and ray tracing)

孙正, 宁辉, 唐敬, 谢永杰, 石鹏飞, 王建华, 王柯. Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014[J]. 中国物理B, 2016, 25(2): 24101-024101.

Zheng Sun(孙正), Hui Ning(宁辉), Jing Tang(唐敬), Yong-Jie Xie(谢永杰), Peng-Fei Shi(石鹏飞), Jian-Hua Wang(王建华), Ke Wang(王柯). Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014[J]. Chin. Phys. B, 2016, 25(2): 24101-024101.

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Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

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