相干测风激光雷达对城市风场典型过程分析  

Analysis of typical process of urban wind field with coherent wind measurement lidar

作　　者：董保华 夏小维 庄鹏 谢晨波 周月凌 孔现涛 罗红艳[6] DONG Baohua;XIA Xiaowei;ZHUANG Peng;XIE Chenbo;ZHOU Yueling;KONG Xiantao;LUO Hongyan(Jiangxi Provincial Climate Center,Nanchang 330000,China;Nanchang National Climate Observatory,Nanchang 330038,China;School of Mechanical Engineering,Chaohu University,Hefei 238000,China;Anhui Lanke Information Technology Co.,Ltd,Hefei 230031,China;Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Machinics,Chinese Acaemy of Sciences,Hefei 230031,China;Shenzhen National Climate Observatory,Shenzhen 518000,China)

机构地区：[1]江西省气候中心,江西南昌330000 [2]南昌国家气候观象台,江西南昌330038 [3]巢湖学院机械工程学院,安徽合肥238000 [4]安徽蓝科信息科技有限公司,安徽合肥230031 [5]中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室,安徽合肥230031 [6]深圳市国家气候观象台,广东深圳518000

出　　处：《红外与激光工程》2025年第1期90-107,共18页Infrared and Laser Engineering

基　　金：江西省气象局重点项目(JX2022Z08);南昌国家气候观象台专项(JX2023Z09);江淮基金项目(2208085UQ03);中国气象局“气候生态产品价值实现研究”青年创新团队项目(CMA2024QN15)。

摘　　要：近年来,极端天气频发,对社会、经济及公共生命安全造成严重影响,亟需实时、高时空分辨率的气象观测手段。为应对气象的变化,利用多普勒效应,结合最大似然离散谱峰估计(ML DSP),寻找能量峰值最大值频谱位置,进行风数据的反演,进而研制一款相干测风激光雷达系统,该系统探测距离为50~4000 m范围内,时间分辨率达到10 s,垂直分辨率30 m。该系统与探空气球比对结果,风速相关性为0.962,风向相关性为0.96,风速标准偏差为0.93 m/s,风向标准偏差为6.52°。通过该雷达系统进一步在平阴县及北京市的进行长期监测,根据监测数据发现受地形及近地面温度影响,城市近地空1 km高度以内风场变化较大,1 km高度以上的风场变化较小。同时对平阴县及北京市典型过程进行分析,发现相干测风激光雷达能够有效地监测到城市降雨及冷暖空气交汇过程,具有良好的风场连续观测能力及典型天气现象的监测和分析能力。该雷达可用于对城市风场监测,为极端天气变化提供实时、高分辨率的数据,进而为气象监测和极端天气预警提供数据支撑。Objective In recent years,extreme weather and natural disasters have occurred frequently,causing great harm to socio-economic and life safety,and real-time meteorological data with high spatiotemporal resolution is urgently needed to predict the occurrence of extreme weather and natural disasters.The wind is one of the important parts of meteorological data,and accurate wind field data plays an important role in meteorology,environment,energy,urban planning,transportation,and emergency response.As point measuring instrμments,contact anemometers such as wind cup anemometers and ultrasonic anemometers have the problem of small measurement range,and the contact measuring equipment needs to invade the wind field,resulting in the distortion of the wind field to be measured.Coherent wind lidar uses the Doppler shift effect of aerosol particles on the beam to measure the wind field.Coherent wind lidar has significant advantages in terms of detection range,data accuracy,and spatiotemporal resolution,which can meet the needs of wind field data in meteorology,environment,transportation,energy,and other fields.In this paper,a self-developed coherent wind lidar system is introduced,its principle and design are introduced,the accuracy of the external field ratio data of the system in Anqing National Basic Meteorological Station is verified,and finally,the urban wind field changes and typical weather processes are analyzed.Methods A coherent wind lidar system is developed in this paper.Based on the principle of Doppler frequency shift(Fig.1),1550nm is selected as the laser beam.The signal frequency is analysed with the ML DSP algorithm to get the period graph,and then the Doppler translation information is obtained.A coherent wind measurement lidar system composed of transmitting,receiving and receiving is designed(Fig 2).According to the error of the comparison between the system and the sounding balloon data,the measurement accuracy of the data is judged(Fig 6).Results and Discussions The correlation between the coherent wi

关 键 词：激光雷达 相干测风 风场比对 城市风场 

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]