基于REAL气溶胶激光雷达在站比对标定技术研究

Aerosol lidar intercomparison observation calibration at lidar stations based on REAL lidar

2019年3月—11月,利用经过欧洲激光雷达标校中心认证的移动REAL标准气溶胶激光雷达,开展了迄今为止国内最大规模的激光雷达在站比对标定。本文首先介绍了一种组网激光雷达在站比对标定方法,然后将REAL雷达与北京、上海、广州3个城市相关站点的12部气溶胶激光雷达在532nm波长下开展了首次在站比对标定。根据预先设定的指标对其中按照气象探测中心(meteorological observation center,MOC)要求完成软硬件标定的11部雷达进行了定量评估。结果表明11部雷达基本满足指标要求,其中9部雷达P/S通道2—5km系统偏差(system deviation,SD)均在±20%以内,超过50%的被标雷达P通道0.5—2km系统偏差基本满足±10%以内。通过在站比对标定技术可以有效识别P/S通道串扰、探测器饱和等问题,确定了超大城市试验中被标雷达可信数据的范围,为气溶胶激光雷达业务化定量应用提供了技术支撑。

From March to November 2019,the largest on-station comparison observation calibration(OCOC)in China was carried out so far,based on the mobile REAL standard aerosol lidar certified by the European lidar calibration center.In this paper,a method for OCOC is firstly introduced.Then,the first OCOC between REAL lidar and 12aerosol lidars distributed in Beijing,Shanghai and Guangzhou were carried out separately at 532nm wavelength.The 11radars which were calibrated in advance according to method of hardware and software calibration established by the meteorological observation center(MOC)were quantitatively evaluated according to the preset quality criteria,and the results show that the 11radars basically meet the requirements.The system deviation(SD)of 9radars P/S channels within a range of 2—5km was all in±20%,and the SD of more than 50%of the calibrated radars P channels within a range of 0.5—2km is basically in±10%.The main problems are P/S channel crosstalk and detector saturation,etc.This work determines the reliable range of data of calibrated radars and provides support for operational quantitative application of aerosol lidar.