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超大城市试验气溶胶激光雷达标定及结果分析

Calibration and result analysis of aerosol LiDAR in megacity experiment

  • 摘要: 为了保证雷达观测数据的准确性, 2017年9月中国气象局气象探测中心在国内首次开展了组网气溶胶激光雷达标定实验, 通过采用单部雷达的光电系统标定和基于统计分析策略的多部雷达比对观测标定方法, 对组网试验雷达共有的532nm米散射通道进行了检查标定。结果表明, 标定完成后, 532nm通道的后向散射系数的相对标准差在1km~2km高度范围从90.8%降低到20.4%, 在2km~5km高度范围从244.3%降低到了35.9%, 数据质量得到了较大提高。此次气溶胶激光雷达标定试验, 使雷达后向散射系数差异显著减小, 大大地改善了雷达观测数据的一致性, 这将为气溶胶激光雷达组网应用提供很好的硬件质控保证。

     

    Abstract: In order to ensure the accuracy of the radar observation data, the first calibration experiment of networked aerosol light detection and ranging (LiDAR) was carried out by Meteorological Observation Center of China Meteorological Administration in september 2017. By adopting the method of single radar's photoelectric system calibration and multi-radar comparison observation calibration based on statistical analysis strategies, the 532nm scattering channel shared by the networked experiment radars was checked and calibrated. After calibration, the relative standard deviation of backscattering coefficient in 532nm channel was reduced from 90.8% to 20.4% in height range of 1km~2km, and from 244.3% to 35.9% in height range of 2km~5km. And the data quality has been greatly improved. In the aerosol lidar calibration experiment, the radar backscattering coefficient difference was significantly reduced, and the consistency of data observation was greatly improved.This work will provide good hardware quality control assurance for aerosol lidar networking applications.

     

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