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首页> 外文会议>International Conference on Lightning Protection >Time-Frequency Features of Lightning-generated Electric Fields Appliying the Local Polynomial Fourier Transform (LPFT)
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Time-Frequency Features of Lightning-generated Electric Fields Appliying the Local Polynomial Fourier Transform (LPFT)

机译：闪电引导电场应用局部多项式傅里叶变换（LPFT）的时频特征

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摘要

In the last two decades, various lightning events have been analyzed using mathematical and signal processing techniques. In this paper, electric field waveforms radiated by negative first and subsequent strokes were analyzed using the Local Polynomial Fourier Transform (LPFT). The analysis provided by LPFT shows the instantaneous frequency (IF) of the signals and its first derivative. The electric field signatures came from a thunderstorm occurred in Bogotá, Colombia. In addition, the return stroke energy concentration is presented in the form of the Local Polinomial Periodogram (LPP). The LPP shows that the return stroke spectrum is distributed in a frequency range with the peak value spread in a specific part of this range. Form the time-frequency analysis provided by LPFT, the energy radiated by negative first return strokes remains in the average frequency range from low frequency (lower than 1 kHz) up to 36 kHz, while the energy radiated by subsequent strokes ranges between 0.5-42 kHz. In addition, for the initial stage and the overshoot region of the transient pulse, the first return stroke signatures present a frequency range slightly higher than those of the subsequent return strokes.
机译：在过去二十年中，已经使用数学和信号处理技术进行了分析了各种闪电事件。在本文中，使用局部多项式傅里叶变换（LPFT）分析由负第一和后续冲程辐射的电场波形。 LPFT提供的分析显示了信号的瞬时频率（IF）及其第一衍生物。电场签名来自哥伦比亚波哥大发生的雷雨。另外，返回行程能量浓度以局部常规阶段（LPP）的形式呈现。 LPP表明返回行程频谱在频率范围内分布，峰值在该范围的特定部分中扩展。通过LPFT提供的时频分析，由负第一返回行程辐射的能量保持在低频（低于1 kHz）高达36 kHz的平均频率范围内，而随后的中风辐射的能量在0.5-42之间辐射。千赫。另外，对于瞬态脉冲的初始阶段和过冲区域，第一返回笔划签名呈现略高于后续返回笔划的频率范围。

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