Long-Range Lightning Interferometry Using Coherency
Long-Range Lightning Interferometry Using Coherency
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DOI：
10.3390/rs15071950
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发表时间：
2023-04
期刊：
影响因子：
--
通讯作者：
Xue Bai;M. Füllekrug
中科院分区：
文献类型：
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作者：
Xue Bai;M. Füllekrug
传统的闪电探测和定位网络使用到达时间（TOA）技术来定位具有单个时间戳的闪电事件。这一贡献介绍了一个模拟研究奠定了新的闪电定位概念的基础。在这里，一种新的干涉方法进行了研究，扩大了数据的使用和映射闪电事件到一个区域，通过使用相干。振幅波形库由按传播距离分类的平均波形组成，首先用于测试干涉测量方法。随后，研究扩展到个人的闪电事件波形。分析信号的幅度和相位相干性在这里被用来进一步发展干涉方法。为了确定闪电事件的单个位置并避免地波和第一天波之间的干扰，提出了两种解决方案：（1）使用小型接收器网络和（2）将脉冲响应函数应用于记录的波形，其使用脉冲来表示闪电发生。这两种方法都有效地消除了第一天波干扰。这项研究可能有助于识别闪电地波没有天波的干扰与远程低频（LF）网络。计划利用反映各种电离层和地理情况的数据扩大模拟工作。
Traditional lightning detection and location networks use the time of arrival (TOA) technique to locate lightning events with a single time stamp. This contribution introduces a simulation study to lay the foundation for new lightning location concepts. Here, a novel interferometric method is studied which expands the data use and maps lightning events into an area by using coherency. The amplitude waveform bank, which consists of averaged waveforms classified by their propagation distances, is first used to test interferometric methods. Subsequently, the study is extended to individual lightning event waveforms. Both amplitude and phase coherency of the analytic signal are used here to further develop the interferometric method. To determine a single location for the lightning event and avoid interference between the ground wave and the first skywave, two solutions are proposed: (1) use a small receiver network and (2) apply an impulse response function to the recorded waveforms, which uses an impulse to represent the lightning occurrence. Both methods effectively remove the first skywave interference. This study potentially helps to identify the lightning ground wave without interference from skywaves with a long-range low frequency (LF) network. It is planned to expand the simulation work with data reflecting a variety of ionospheric and geographic scenarios.