基于相关计算的激光雷达二维风场探测  

Two-Dimensional Wind Field Measurement Based on Lidar Signal Correlation

作　　者：张战盈[1,2] 蔡熠 余东升 陈海燕 方蔚恺 杨喆 徐青山 储焰南 徐赤东[1,3] Zhang Zhanying;Cai Yi;Yu Dongsheng;Chen Haiyan;Fang Weikai;Yang Zhe;Xu Qingshan;Chu Yannan;Xu Chidong(Anhui Province Key Laboratory of Medical Physics and Technology t Center of Medical Physics and Technology,Hefei Institutes of Physical Science f Chinese Academy of Sciences,Hefei,Anhui 230031,China;University of Science and Technology of China,Hefei,Anhui 230026,China;Center for Basic Scientific Research,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,AnJrni 230031,China)

机构地区：[1]中国科学院合肥物质科学研究院医学物理与技术中心医学物理与技术安徽省重点实验室,安徵合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]中国科学院合肥物质科学研究院安徽光学精密机械研究所基础科学研究中心,安徽合肥230031

出　　处：《光学学报》2019年第6期18-27,共10页Acta Optica Sinica

基　　金：民用航天“十三五”技术预先研究项目(D040103)

摘　　要：提出了一种基于相关计算的激光雷达三光束二维风场反演方法。三束激光从同一平面发射,通过计算三束激光时间序列上的回波信号相关性反演二维风场信息。详细阐述了三光束二维风场反演方法的原理和计算过程,基于此方法搭建了相关二维测风激光雷达系统,实现了30 m距离分辨率和1 s时间分辨率的二维风场探测。分析了系统中激光雷达夹角对测量结果的影响和相关计算时不同时间序列长度下相关系数曲线的变化,给出了合适的激光雷达夹角和时间序列长度。用该系统进行了水平测风实验,对比了系统探测数据和探测路径上风塔的风速、风向传感器数据,结果表明系统和传感器的数据具有较好的一致性。This study proposed a two-dimensional wind field inversion method based on the calculation of the correlation among three laser beams. Three beams were emitted in the same plane, and the two-dimensional wind field data were recovered by calculating the correlation among the three echo signals over time. The principle behind the method and the calculation process were described in detail herein. Then, this approach was used to construct a correlation-based two-dimensional wind lidar system, which could achieve the fast two-dimensional wind detection with a spatial resolution of 30 m and a time resolution of 1 s. The influence of lidar angle on the measurement results and the variations in the correlation coefficient curves under different lengths of time sequences were analyzed, and the suitable lidar angle and length of a time sequence were determined. The horizontal wind measurement experiment was conducted to compare the data by the proposed system with the sensing data of wind speed and direction by a wind tower in the detection path. The results show that the data from the proposed system are well consistent with those from the sensor.

关 键 词：大气光学 激光雷达 相关计算 二维风场 时间序列 

分 类 号：TN958.98[电子电信—信号与信息处理]