A new approach to map lightning channels based on low-frequency interferometry
A new approach to map lightning channels based on low-frequency interferometry
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DOI：
10.1016/j.atmosres.2020.105139
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发表时间：
2021
影响因子：
5.5
通讯作者：
Yanan Zhu;M. Stock;P. Bitzer
中科院分区：
文献类型：
--
作者：
Yanan Zhu;M. Stock;P. Bitzer
一个纯粹的干涉算法，命名为成像算法，已被开发用于映射闪电在低频波段。成像算法通过计算到达一对闪电传感器的闪电信号的三维相关性来定位闪电源，然后将所有天线对的相关性求和。该算法不通过求解非线性的到达时间（TOA）方程来定位源，而是将源定位在总相关的全局最大值处。对云内闪电的成像算法与混合干涉TOA算法的闪电图进行了比较。与混合算法相比，成像算法可以定位更多的源，并产生更完整的闪电图。我们还证明了成像算法可以定位多个并发的闪电源，即使从脉冲记录的信号在时间上重叠在一些站，这是不可能与传统的TOA为基础的技术。
A purely interferometric algorithm, named imaging algorithm, has been developed for mapping lightning in the low-frequency band. The imaging algorithm locates a lightning source by computing the three-dimensional correlation of the lightning signals arriving at a pair of lightning sensors, and then summing the correlations of all antenna pairs. This algorithm does not locate the source by solving the non-linear time-of-arrival (TOA) equations, instead the source is located at the global maxima of the total correlation. The lightning map produced by the imaging algorithm for one intracloud flash was compared with that of the hybrid interferometric-TOA algorithm. The imaging algorithm can locate more sources than the hybrid algorithm and produce more complete lightning maps. We also demonstrated that the imaging algorithm can locate multiple concurrent lightning sources even though the recorded signals from the pulses overlap in time at some stations, which is not possible with a traditional TOA-based technique.