Recent Evolution of the U . S . National Lightning Detection Network-猫眼课题宝

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2014

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A. Nag;M. Murphy;K. Cummins;A. Pifer;J. Cramer

2013年对美国国家闪电探测网络（NLDN）进行了更新，从而提高了性能。维萨拉的LS 7002传感器已经部署，取代了老一代的LS 7001和IMPACT传感器。LS 7002充分利用了LS 7001的数字传感器技术，并提供了具有增强功能的改进型嵌入式软件。这提高了传感器对低振幅闪电产生的信号的灵敏度，并增强了对云和云对地闪电的检测。此外，NLDN中的中央处理器算法正在更新，以包括使用多个波形参数对闪电进行分类的新技术，用于闪电脉冲串中多个脉冲的地理定位的“突发处理”算法，以及改进电磁波传播的处理，从而导致更小的到达时间误差。NLDN的中值定位精度（由50%误差椭圆的半长轴的长度给出）预计在网络内部约为200 m。这些性能特征继续验证触发闪电，塔罢工，网络相互比较，和相机的研究。我们研究了NLDN在2013年9月初至11月底在美国本土内部报告的闪电放电。NLDN报告的绝大多数（87%）闪光是IC。NLDN在此期间报告的CG闪光中，81%为阴性，19%为阳性。负CG闪光的平均多重性（闪光的笔画数）为2.7，正CG闪光的平均多重性为1.4。负性和正性首次放电峰值电流中位数分别为15 kA和19 kA。关键词-美国NLDN;性能特征;云闪;云地闪;探测效率;定位精度;峰值电流

Updates were made in 2013 to the U.S. National Lightning Detection Network (NLDN) that has led to performance improvements. Vaisala’s LS7002 sensors have been deployed, replacing the older generation LS7001 and IMPACT sensors. The LS7002 takes advantage of the LS7001’s digital sensor technology and provides improved embedded software with enhanced features. This improves the sensitivity of the sensor to low amplitude lightning-generated signals and leads to enhanced detection of cloud and cloud-to-ground lightning. Additionally, the central processor algorithms in the NLDN are being updated to include new techniques for classifying lightning using multiple waveform parameters, a “burst processing” algorithm for geolocation of multiple pulses in lightning pulse trains, and improved handling of electromagnetic wave propagation resulting in smaller arrival-time errors. The median location accuracy (given by the length of the semi-major axis of the 50% error ellipse) the NLDN is expected to be about 200 m in the interior of the network. These performance characteristics continue to be validated by triggered lightning, tower strikes, network inter-comparison, and camera studies. We examine lightning discharges reported by the NLDN in early September to late November, 2013 within the interior of the contiguous United States. The large majority (87%) of flashes reported by the NLDN were ICs. Of the CG flashes reported by the NLDN during this period 81% were negative and 19% were positive. The average multiplicity (number of strokes were flash) for negative CG flashes was 2.7 and for positive CG flashes was 1.4. The negative and positive first stroke median peak current was 15 kA and 19 kA, respectively. Keywords—U.S. NLDN; performance characteritics; cloud lightning; cloud-to-ground lightning; detection efficiency; location accuracy; peak current

Recent Evolution of the U . S . National Lightning Detection Network

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