基于Licel记录仪的激光雷达数据修正技术研究

Study of the calibration techniques for lidar data using Licel transient recorders

作为重要的大气遥感探测仪器,激光雷达在气候和环境监测中扮演越来越重要的角色。Licel数据记录仪是专门针对激光雷达所开发的数据采集仪器,可同时提供模拟探测和光子计数探测模式的数据采集。针对激光雷达模拟数据和光子计数数据的特点,开展了光子计数数据的死区时间校正、模拟数据和光子计数数据的拼接拟合以及二者数据廓线错位的修正技术研究。结果表明,修正后的激光雷达回波具有更高的信噪比和位置精度,能更清晰地归一化表达大气状态信息的变化。

As an atmospheric remote sensing tool,lidar plays an increasingly important role in the monitor of meteorology and environment.The Licel transient recorder is a data acquisition system combining the analog mode and the photon-counting（PC）mode,which is designed for application of lidar.For the characteristics of analog data,and PC data,the data calibration techniques are studied to improve the quality of lidar data trace and the uniform expression of atmospheric information,including the dead time correction of PC data,the merging technique between analog data and PC data,and the calibration method for the mismatch between analog data and PC data.The results show that the lidar return after calibration has a higher signal to noise ratio and more precision for detecting range,presenting the variation of atmospheric information uniformly and clearly.