Evaluation of detection efficiency of coherent wind LiDAR
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摘要: 为了评估相干测风激光雷达在不同扫描模式下探测效能与气象要素之间的联系，使用2020-08~2021-07期间广汉机场相干测风激光雷达探测数据进行了分析验证。结果表明，方位角测量模式扫描方式下，探测距离在3 km之后，探测效能线性下降, 90°扫描时，500 m后探测效能开始线性下降；总体探测效能在11月最高，7月最低；11月至次年7月呈下降趋势，7~11月呈上升趋势；在日落后至日出前的探测效能较低，在午间探测效能最高；夏秋季节，激光雷达探测效能与PM2.5质量浓度呈现正相关，与降雨量的对数呈负相关。该研究为机场激光雷达识别低空风切变准确度提供了重要的基础保障。Abstract: In order to evaluate the relationship between detection efficiency and meteorological elements in different scanning modes of coherent wind light detection and ranging(LiDAR), the detection data of coherent wind LiDAR at Guanghan Airport from August 2020 to July 2021 were used for analysis and verification. The results show that the detection efficiency decreases linearly after the detection range is larger than 3 km under plane position indicator scanning mode; When scanning at 90°, the detection efficiency decreases linearly after 500 m; The overall detection efficiency was highest in November, lowest in July, and decreased from November to following year in July, and increased from July to November; The detection efficiency is low from sunset to sunrise, and the detection efficiency is highest at noon; In summer and autumn, LiDAR detection efficiency is positively correlated with PM2.5 concentration, and negatively correlated with logarithm of precipitation, it provides an important basic guarantee for the accuracy of airport LiDAR identification of low-level wind shear.
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图 1 广汉机场激光雷达及观测设施位置
Figure 1. Location of LiDAR and observation facilities at Guanghan Airport
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图 3 PPI、RHI扫描时不同距离的探测效能
Figure 3. Detection efficiency at different distances of PPI and RHI scanning
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图 4 PPI 4°、RHI 90°方向探测效能频率统计图
Figure 4. Statistics chart of detection efficiency frequency of PPI 4° and RHI 90° direction
表 1 逐月探测效能与PM2.5质量浓度的相关系数表
Table 1 Correlation between monthly detection efficiency and PM2.5 concentration
month 1 2 3 4 5 6 RPM2.5 0.29 0.56** 0.18 0.28 0.47** 0.29 month 7 8 9 10 11 12 RPM2.5 0.42* 0.59** 0.47** 0.48** 0.42* -0.16 
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表 2 有无降雨时探测效能的相关系数表(6~8月)
Table 2 Correlations of detection efficiency with or without rainfall(from June to August)
with rainfall without rainfall RPM2.5 0.32* 0.47** Rrainfall -0.30* —
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