Lightning VHF Radiation Mapping Method for an Irregular Short‐Baseline Array
Lightning VHF Radiation Mapping Method for an Irregular Short‐Baseline Array
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DOI：
10.1029/2022ea002752
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发表时间：
2023-05
影响因子：
3.1
通讯作者：
Shanfeng Yuan;X. Qie;R. Jiang;Zhuling Sun;Fengquan Li;Jing Yang
中科院分区：
文献类型：
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作者：
Shanfeng Yuan;X. Qie;R. Jiang;Zhuling Sun;Fengquan Li;Jing Yang
闪电甚高频干涉测量是研究雷暴云中闪电先导发展的重要工具，常规天线阵列由两个共面正交基线组成。在这项研究中，我们开发了两个新的定位方法的基础上的优化算法，使用所有的基线在计算中的不规则阵列。此外，还分析了两种时间不确定性对定位结果的影响，并给出了一种标定方法。第一类是天线的系统时间漂移，它会对定位结果产生偏移，导致定位精度下降。在实验过程中，我们可以有效地校准每个天线的时间漂移。第二种是不同天线之间的波形失真，它会在时间上引入噪声，导致精度降低。当使用更多基线时，无论它们是独立的还是冗余的，定位精度都会提高。结果表明，在考虑角度不确定度理论分布的情况下，非共面构形可以显著改善地平附近的仰角不确定度和天顶附近的方位角不确定度。
Lightning very high frequency interferometry is a crucial tool for studying the development of lightning leaders within thunderclouds, and the conventional antenna array is composed of two coplanar orthogonal baselines. In this study, we develop two new location methods for an irregular array based on the optimization algorithm, using all baselines in the calculation. Besides, we have analyzed the effects of two kinds of time uncertainty on the location result and provided a calibration method. The first type—the systematic time drift of antennas—can induce an offset on the location result, leading to a worse accuracy. We can calibrate the time drift of each antenna efficiently during the experiment. The second type—the waveform distortion between different antennas—can introduce the noise on time, leading to worse precision. The location precision improves when more baselines are used, whether they are independent or redundant. Our result shows that the non‐coplanar configuration can significantly improve the elevation uncertainty near the horizon and the azimuth uncertainty near the zenith after considering the angular uncertainty's theoretical distribution.