基于相干多普勒激光雷达的斜程湍流参数反演方法研究  

Inversion methods of slant turbulence parameters based on coherent Doppler lidar

作　　者：陈晓敏 张洪玮 孙康闻 吴松华[1,2] CHEN Xiaomin;ZHANG Hongwei;SUN Kangwen;WU Songhua(College of Marine Technology,Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China)

机构地区：[1]中国海洋大学信息科学与工程学部海洋技术学院,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室,区域海洋动力学与数值模拟功能实验室,山东青岛266237

出　　处：《大气与环境光学学报》2023年第1期1-13,共13页Journal of Atmospheric and Environmental Optics

基　　金：国家重点研发计划(2019YFC1408001),国家自然科学基金(61975191,41905022)。

摘　　要：大气湍流广泛存在于大气中,其中斜程湍流对航空航天、天文观测等会产生不可忽视的影响。一方面利用相干多普勒测风激光雷达获得的高时空分辨风场探测数据,另一方面基于Kolmogorov局地均匀各项同性理论,即在惯性子区内湍流的特征只与湍能耗散率ε有关,将速度结构函数法应用到飞机着陆阶段下滑道扫描模式中,通过实测数据的速度结构函数与模型速度结构函数最小二乘法拟合,从而估算激光雷达扫描范围内的大气湍流参数(径向风速方差、湍流积分尺度和ε等)。根据下滑道扫描区域数据的时空分布特征,给出大气湍流参数的斜程空间分布图,并与同步观测的飞机下滑道风切变强度数据进行了对比分析,发现两者具有较好的一致性,证实了斜程湍流参数反演方法的可靠性。Atmospheric turbulence is widespread in the atmosphere,in which the slant turbulence has a significant impact on aerospace and military activities.On the one hand,the high spatial and temporal resolution wind field data obtained from the coherent Doppler lidar is used.On the other hand,according to the velocity structure function method based on Kolmogorov's local uniform homogeneous theory,i.e.the characteristics of turbulence in the inertial sub-region are only related to the turbulent eddy dissipation rateε,the velocity structure function method is applied to the lidar glide-path scans mode for aircraft landing period.By fitting the measured data velocity structure function with the model velocity structure function least square,the atmospheric turbulence parameters(wind speed variance,turbulence integration scale andε,etc)within the lidar swath are estimated.Furthermore,based on the spatial and temporal distribution characteristics of the data in the slant scanning area,the slant spatial distribution of the atmospheric turbulence parameters is presented and compared with the wind-shear intensity data obtained from the lidar glide-path scans mode developed by Ocean University of China.It is found that the two data are in good agreement,which validates the reliabiltiy of the proposed slant turbulence parameter retrieval method.

关 键 词：相干多普勒测风激光雷达 斜程大气湍流 速度结构函数 

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