为客观评估粤港澳闪电定位系统性能参数, 将闪电定位资料与广州人工触发闪电试验及高建筑物自然闪电观测试验的观测结果进行了对比分析.结果表明, 2007-2011年期间对真实闪电事件的闪电探测效率和回击探测效率分别为74%和40%, 定位误差的算术平均值和几何平均值分别为2660 m和1500 m; 2012年闪电探测效率和回击探测效率分别为97%和90%, 定位误差的算术平均值和几何平均值分别为950 m和470 m.2008-2011年期间闪电定位系统的回击电流幅值约为真实值的0.7 倍, 而2012年约为真实值的4倍.总体上, 2012年粤港澳闪电定位系统探测子站大幅度增加后, 探测效率和定位精度均有明显提升, 但对回击电流幅值的估算呈现系统性偏大.
Lightning location records were comprehensively compared with the high-resolution observation of triggered lightning and natural lightning in Guangzhou, to evaluate the performance characteristics of the Lightning Location System of Guangdong-Hongkong-Macau. The results show that the flash detection efficiency and stroke detection efficiency were about 74% and 40% respectively during 2007-2011, while 97% and 90% respectively in 2012. The arithmetic mean value and median value for location error was estimated to be about 2660 m and 1500 m during 2007-2011, while 950 m and 470 m respectively in 2012. Lightning Location System reported peak currents of triggered lightning records were about 30% lower than the truth during 20082012, while 300% higher in 2012. When the number of detection sub-station was significantly increased in 2012, the detection efficiency and location precision were found to be obviously improved, but the peak currents of return strokes were systematically overestimated.
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