基于相干激光雷达气象多要素探测  

Meteorological multi-element detection based on coherent lidar

作　　者：罗雄[1,2] 史悦 范琪 尹微 彭涛 赵培娥[1,2] 王柯 周鼎富[1,2] Luo Xiong;Shi Yue;Fan Qi;Yin Wei;Peng Tao;Zhao Peie;Wang Ke;Zhou Dingfu(Southwest Institute of Technical Physics,Chengdu 610041,China;Lidar and Devices Laboratory of Sichuan,Chengdu 610041,China;Science College,Civil Aviation Flight University of China,Guanghan 618307,China)

机构地区：[1]西南技术物理研究所,四川成都610041 [2]激光雷达与器件技术四川省国防科技重点实验室,四川成都610041 [3]中国民用航空飞行学院理学院,四川广汉618307

出　　处：《红外与激光工程》2023年第11期59-68,共10页Infrared and Laser Engineering

基　　金：四川省科技计划项目(2022YFG0352)。

摘　　要：相干激光测风雷达具有体积小、探测效率高、信噪比强等特点,在气象、航空保障以及风电等行业得到了广泛的应用,但是目前雷达数据产品大多是利用回波多普勒频移信息反演的风场数据产品,未对雷达回波信号强度信息进行数据挖掘。针对当前相干激光测风雷达数据产品开发不足的问题,介绍了一种新型基于相干探测的激光雷达数据产品生成技术,该技术在探测风场的同时,实现云高、消光系数及能见度等多种气象要素数据产品的生成。首先,通过分析回波信号特性,推导出雷达回波信号功率的计算方法,获取探测范围内各距离位置的回波信号强度信息。在此基础上,利用阈值法和微分零叉法反演出云底高度,同时采用改进型Klett算法实现大气消光系数的反演,继而实现能见度的测量。最后,与气象站能见度仪、激光云高仪以及532 nm气溶胶激光雷达进行数据对比验证试验,试验数据结果显示:云高对比精度可达5.0%,能见度对比精度可达12.2%,消光系数对比有较好的一致性,并可长期在多种气象环境下连续测量。Objective Coherent lidar has the characteristics of small size,high detection efficiency and strong signal-tonoise ratio,and has been widely used in meteorology,aviation and wind power industries.But at present,most coherent wind lidar data products only use echo Doppler frequency shift information to retrieve wind field related products,and do not mine lidar echo signal strength information.Therefore,it is necessary to deeply process the echo signal data of lidar.Methods Considering the insufficient development of the current coherent lidar data products,a new lidar detection technology based on coherent detection was introduced(Fig.1),which can detect various meteorological factors such as cloud height,extinction coefficient and visibility while detecting the wind field.Firstly,by analyzing the characteristics of the echo signal of the coherent wind lidar,the calculation method of the spectrum echo signal power of the coherent wind lidar was derived,and the echo signal strength information of each distance position in the detection range was obtained.Then the differential zero cross and threshold method were used to inverse the cloud bottom height,and the improved Klett method algorithm was used to inverse the atmospheric extinction coefficient,and the visibility measurement was realized.Finally,it was compared with horizontal visibility meter in weather station(Fig.3),laser altimeter(Fig.4)and 532 nm aerosol lidar(Fig.5)for verification.Results and Discussions The results showed that the cloud height,visibility and the extinction coefficient were in good agreement,and lidar can continuously work in various meteorological environments.The cloud height detected by lidar and Vaisala showed that the correlation coefficient is 99.57%,which fully demonstrates the feasibility and accuracy of cloud height by lidar(Fig.3).The standard deviation and root mean square error of lidar are 5%and 7.2%respectively.The trend of visibility data measured by lidar and visibility meter is consistent,and the correlation coefficient

关 键 词：激光雷达 气象探测 相干探测 消光系数 能见度 云高 

分 类 号：TN958.98[电子电信—信号与信息处理] P407.5[电子电信—信息与通信工程]