云空间分布的扫描激光雷达观测

The Observation of Cloud Spatial Distribution Using a Scanning LIDAR

激光雷达在云观测中起着非常重要的作用,是云遥感探测的主要仪器之一。目前,激光雷达大都是固定指向天顶角或者某个角度,对云分布的取样有限。本文建立用于云观测的扫描激光雷达,该系统使用小型固态激光器背负于接收望远镜上,望远镜固定于三维扫描平台,整个系统可以工作于不同的扫描模式以实现全天空云的监测。通过利用该扫描激光雷达对云的分布进行测量,并与已有激光雷达观测数据的对比,结果表明,与传统激光雷达相比扫描激光雷达能够精细的描述出云高和云光学厚度的空间分布,体现了扫描测量激光雷达在云探测方面的优势。

LIDAR which plays a very important role in the cloud observation is one of the main instruments of cloud remote sensing. At present, most LIDAR is pointed vertically or to a certain angle. In this mode, sampling of cloud distribution is limited. A scanning LIDAR for cloud observation is constructed, in which a small solid-state laser is bearded on the receiving telescope. The telescope is fixed to the 3D scanning platform, so the whole system can work in different scanning modes in order to realize the monitoring of the whole sky clouds. Then the scanning LIDAR is used to the observation of cloud,and the result is compared with the existing RRML. The cloud measurement result shows that the scanning LIDAR can describe the distribution of the height and the optical depth with high spatial resolution, which reflects the advantage of scanning LIDAR in cloud detection.