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为了有效确定地基激光雷达系统的几何因子,修正地基激光雷达信号接收过渡区内的回波信号,提出了一种反演几何因子的新方法。利用星载激光雷达(CALIPSO)可以覆盖地基激光雷达探测过渡区的特点,结合星载与地基激光雷达同步获取的回波信号,分别反演了离轴和同轴模式下的几何因子,并同成熟的拉曼-米氏几何因子反演方法,以及Su Jia的联合测量法作对比。在几何因子过渡区内,校正后的气溶胶后向散射系数与Su Jia的方法相比,离轴和同轴模式下的平均相对误差分别提高了25.4%和10.4%。该方法克服了弹性散射激光雷达水平测量法中因大气均匀假设导致的几何因子测量结果的不确定性,更适用于应用广泛的弹性散射激光雷达,且可以利用CALIPSO每月过境时间稳定的特点,对系统几何因子进行常规标定。
In order to effectively determine the geometrical factors of the ground-based laser radar system and to correct the echo signals in the ground-based lidar signal receiving transition region, a new method to invert the geometrical factors is proposed. With the help of the satellite-borne lidar (CALIPSO), the characteristics of ground-based lidar detection transition zone can be covered. Combined with the echo signals acquired by satellite and ground-based lidar simultaneously, the geometric factors of off-axis and in-line modes are inverted, Proven Raman-Mie method of geometric factor inversion, and Su Jia’s co-measurement method for comparison. The corrected aerosol backscatter coefficient was 25.4% and 10.4% higher for the off-axis and coaxial modes, respectively, than the Su Jia method, in the geometric factor transitional region. The method overcomes the uncertainty of geometric factor measurement results due to the even assumption of the atmosphere in the elastic scattering lidar leveling method and is more suitable for the widely used elastic scattering lidar and can utilize the characteristics of the CALIPSO monthly transit time stability, The system geometry is routinely calibrated.