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初步反演结果表明,Fernald前向积分法(FFIM)能够用于机载大气探测激光雷达气溶胶后向散射系数的反演,但相应的理论解释没见国内外相关文献报道.根据合肥地基大气探测激光雷达2008年2月27日的探测数据模拟得到的机载激光雷达数据,对FFIE用于机载大气探测激光雷达气溶胶后向散射系数的反演结果进行了定量分析,分析表明:当反演标定点的高度选在10km左右时,FFIM能够用于机载大气探测激光雷达气溶胶后向散射系数反演的主要原因有3个:1)Fernald前向积分方程(FFIE)分母中两项的差值一般远大于零,这决定了FFIM应用于机载大气探测激光雷达气溶胶后向散射系数反演时,反演误差不会无限大而且反演结果不会出现负值;2)标定值误差为100%时,在整个反演过程中误差项的值仅变化了0.006,是标定值没有误差时分母值的0.6%;3)FFIE的标定项中分子的后向散射系数占主导地位,标定点的气溶胶后向散射系数变化较大的值,对整个标定项的值影响却很小.研究表明,上疏下密的大气结构和较高的标定位置是FFIM能够用于机载大气探测激光雷达气溶胶后向散射系数反演的根本原因.
The preliminary inversion results show that the Fernald forward integration method (FFIM) can be used to backscatter backscattering coefficients of airborne LASAR aerosols, but the corresponding theoretical explanations have not been reported in domestic and foreign literature.According to the Hefei foundation atmosphere The results of backscattering of aerosol backscattering data from FFIE used in airborne detection Lidar were quantitatively analyzed. The results show that when the data of airborne Lidar obtained from the probe data of February 27, 2008, There are three main reasons why FFIM can be used to backscatter backscatter coefficients of airborne LASAR aerosols when the height of inversion calibration points is about 10km: 1) Two of the denominators of Fermi’s forward integral equation (FFIE) The difference between the two factors is generally much larger than zero, which determines the inverse error of inversion will not be infinite and the inversion result will not be negative when FFIM is applied to backscatter inversion of airborne LASAR aerosol.2) When the calibration error is 100%, the value of the error term only changes by 0.006 during the whole inversion process, which is 0.6% of the denominator value without error of the calibration value. 3) The backscattering coefficient of molecules in the calibration item of FFIE dominates Status, standard The larger value of fixed point aerosol backscattering coefficient has little effect on the value of the entire calibration term.Studies show that the structure of the upper and lower dense atmosphere and the higher calibration site are the FFIMs that can be used for airborne airborne detection Fundamental Reasons for Backscattering Coefficients of Lidar Aerosols.