Multiple-Antennae Observation and EMTR Processing of Lightning VHF Radiations
Multiple-Antennae Observation and EMTR Processing of Lightning VHF Radiations
复制标题
闪电 VHF 辐射的多天线观测和 EMTR 处理
DOI：
10.1109/access.2018.2833115
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发表时间：
2018-05
期刊：
影响因子：
3.9
通讯作者：
Liu Bo
中科院分区：
文献类型：
--
作者：
Wang Tao;Shi Li Hua;Qiu Shi;Sun Zheng;Zhang Qi;Duan Yan Tao;Liu Bo
为了定位闪电放电中的微弱源，开发了改进的宽带甚高频观测系统。系统配置和定位算法都是专门为定位背景噪声中的微弱辐射源而设计的。该系统由七个“L”形宽带全向天线组成，并以连续捕获模式运行。采用频域设计的电磁时间反演方法来定位辐射源。引入了两个指标来区分实际雷电源和噪声事件。通过数值模拟和现场校准来测试系统的弱源定位性能。此外，还研究了空间分辨率、鲁棒性和多源定位能力的性能。最后，该系统用于绘制时间分辨率 $0.128~\mu \text{s}$ 的经典触发闪电的向上正先导（UPL）的传播。结果证明，所提出的系统可以很好地描述UPL直到其消失的整个过程，并详细介绍了所提出的七天线阵列在检索弱辐射方面的优势。
In order to locate the faint sources in the lightning discharge, an improved broadband VHF observation system is developed. Both the system configuration and locating algorithm are specially designed to locate weak radiation sources from background noise. The proposed system consists of seven broadband omnidirectional antennas in “L” shape and runs in continuous acquisition mode. An electromagnetic time reversal method designed in frequency domain is applied to locate the radiation sources. Two metrics have been introduced to distinguish between actual lightning sources and noise event. Numerical simulations and field calibration are carried out to test the system’s performance in locating weak sources. Moreover, the performance on spatial resolution, robustness, and the ability of multi-source localization are investigated. Finally, this system is applied to map the propagation of the upward positive leader (UPL) from a classical triggered lightning with time resolution $0.128~\mu \text{s}$ . The results prove that the proposed system could well depict the whole progression of UPL until its extinction, and the advantages of the proposed seven antennas array in retrieving weak radiations are presented in detail.
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影响因子：
16.6
作者：
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DOI：
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发表时间：
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期刊：
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影响因子：
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影响因子：
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作者：
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影响因子：
2.1
作者：
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