Broadband VHF Localization of Lightning Radiation Sources by EMTR
Broadband VHF Localization of Lightning Radiation Sources by EMTR
复制标题
通过 EMTR 对闪电辐射源进行宽带 VHF 定位
DOI：
10.1109/temc.2017.2651142
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发表时间：
2017-02
影响因子：
2.1
通讯作者：
Yun Li
中科院分区：
文献类型：
--
作者：
Tao Wang;Shi Qiu;Li-Hua Shi;Yun Li
本文提出了一种将电磁时间反转（EMTR）技术应用于宽带甚高频（VHF）的闪电辐射源到达方向（DOA）估计的映射算法，并进行了验证。基于阵列信号DOA估计理论和时间反转（TR）原理，建立了宽带VHF阵列雷电辐射接收模型，推导了任意方向的TR合成信号。证明了合成信号范数最大的方向是对入射方向的最优估计，并由此导出了EMTR-VHF方法的计算步骤。通过数值仿真对算法进行了验证，研究了阵列空间分辨率与可用信号频率的关系、算法的鲁棒性等。设计了幅值比和能量比两个指标来滤波假位置，并通过仿真进一步估计了它们的可接受范围。为了进一步验证EMTR-VHF算法，进行了现场实验。结果表明，EMTR-VHF方法具有较好的效果，特别是对于低海拔源，误差小于1°。最后，介绍了EMTR-VHF方法在云对地负闪定位中的应用。leader-return stroke序列的时空发展可以很好地描述。结果与VHF干涉测量技术基本一致，证实了其在闪电定位中的能力。此外，还分析了该算法与宽带干涉测量方法的差异。
In this paper, a novel mapping algorithm by applying electromagnetic time reversal (EMTR) technique to broadband very high frequency (VHF) for the direction-of-arrival (DOA) estimation of lightning radiation sources is proposed and validated. Based on the theory of array signal DOA estimation and time reversal (TR) principle, the lightning radiation receiving model with broadband VHF array is established, and thereafter the TR synthesized signal for arbitrary direction is derived. It is proved that the direction with the maximum norm of synthesized signal is the optimal estimation for the incident direction, and hence the procedure for the EMTR-VHF method is derived. Numerical simulations are conducted for testing the algorithm and investigating the relationships between the array spatial resolution and the available signal frequencies, robustness of the algorithm, et al. Two metrics, amplitude ratio and energy ratio, are devised to filter false locations, and the acceptable ranges of them are further estimated by simulation. In order to further validate the EMTR-VHF algorithm, field experiments are carried out. The results show that the EMTR-VHF method performs well, especially for the sources with low elevations, with the error less than 1°. Finally, the application of EMTR-VHF method in locating a negative cloud-to-ground flash is presented. Temporal and spatial development of the leader-return stroke sequence could be well depicted. The results are generally consistent with the VHF interferometry technique, which confirm its ability in lightning localization. Besides, the discrepancy between this algorithm and broadband interferometry method are documented.
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DOI：
--
发表时间：
2000
期刊：
--
影响因子：
--
作者：
Mathias Fink
通讯作者：
Mathias Fink
DOI：
10.1002/2015jd023702
发表时间：
2016-01
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
Zhuling Sun;X. Qie;Mingyuan Liu;R. Jiang;Zhichao Wang;Hongbo Zhang
通讯作者：
Zhuling Sun;X. Qie;Mingyuan Liu;R. Jiang;Zhichao Wang;Hongbo Zhang
影响因子：
5.2
作者：
R. Mardiana;Z. Kawasaki
通讯作者：
R. Mardiana;Z. Kawasaki
影响因子：
5.7
作者：
de Rosny, Julien;Lerosey, Geoffroy;Fink, Mathias
通讯作者：
Fink, Mathias
影响因子：
56.9
作者：
Lerosey, Geoffroy;De Rosny, Julien;Fink, Mathias
通讯作者：
Fink, Mathias