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基于几何分析,将离轴激光雷达在近距离范围内望远镜视场与发射激光分布的交叠区分为三种形状,并给出了计算离轴激光雷达重叠因子的解析计算公式.基于该公式和发射激光的高斯分布得到了本实验室Mie散射激光雷达重叠因子随高度的变化曲线.利用该曲线对成都地区在不同天气状况下的雷达回波信号进行了校正.在此基础上,利用Klett算法对校正后的回波信号进行了反演,得到了532nm波长大气消光系数随高度的变化曲线.结果表明,基于文中校正方法得到的大气消光系数能反映实际的天气情况.
Based on the geometric analysis, the overlap of the telescope’s field of view and the emitted laser light in the short-range range of the off-axis Lidar is divided into three shapes, and the analytical formula for calculating the overlap factor of the Lidar lidar is given. Based on the formula The Gaussian distribution of the emitted laser beam is obtained with the curve of the overlap factor of the Mie scattering lidar with the altitude of the laboratory.The radar echo signal of Chengdu under different weather conditions is calibrated.On this basis, The corrected echo signal is inversed and the atmospheric extinction coefficient at 532nm wavelength is obtained with height.The results show that the atmospheric extinction coefficient based on the correction method in the paper can reflect the actual weather conditions.