星地同步观测数据的地基激光雷达几何因子反演方法

发布时间：2018-05-08 11:15

本文选题：遥感 + 激光雷达　；参考：《中国激光》2017年09期

【摘要】：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。
[Abstract]:In order to effectively determine the geometric factors of the ground-based lidar system and correct the echo signals in the transition region, a new method for retrieving the geometric factors is proposed. Based on the characteristic that spaceborne laser radar (CALIPSO) can cover the transition area of ground-based lidar detection, the geometric factors in off-axis and coaxial mode are inversed, respectively, according to the echo signals obtained simultaneously by spaceborne and ground-based lidar. The results are compared with the developed Raman-Mie geometric factor inversion method and Su Jia's combined measurement method. In the geometric factor transition region, the corrected aerosol backscattering coefficient increases by 25.4% and 10.4% respectively in off-axis and coaxial mode, compared with Su Jia's method. This method overcomes the uncertainty of the geometric factor measurement results caused by the assumption of atmospheric homogeneity in the elastic scattering lidar horizontal measurement method, and is more suitable for the widely used elastic scattering lidar. In addition, the system geometry factor can be calibrated regularly by using the characteristic of CALIPSO monthly transit time stability.
【作者单位】：北京理工大学光电学院;
【基金】：国家自然科学基金青年科学基金(61505009)
【分类号】：TN958.98

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