米氏散射激光雷达近场距离校正函数曲线拟合法修正  

The Correction of Short-Range Laser Lidar Returns with Fitting to Lidar Range-Adjusted Power

作　　者：贺应红[1] 郑玉臣[2] 程娟[1] 左浩毅[1] 杨经国[1] 

机构地区：[1]四川大学物理系,成都610064 [2]香港城市大学物理及材料科学系

出　　处：《光学学报》2005年第3期289-292,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60078020);国防科技重点实验室基金(00JS75.3.1.JW1906)资助课题

摘　　要：报道了一种修正米氏散射激光雷达近场回波信号的新方法,首先对近场区实测回波信号距离校正函数进行二次曲线拟合,获得拟合曲线与实测曲线的差分信号;然后对远场距离校正函数作直线拟合,在大气近似均匀假定下,获得近场回波信号距离校正函数直线斜率;最后将近场差分信号叠加在该直线上,获得修正后的近场回波信号距离校正函数曲线。用此方法对米氏散射激光雷达近场回波信号的实际计算证明,该方法可获得与实际更为接近的反演结果。A new method for correcting scattering laser lidar data is reported. Firstly, in the insufficient overlapping range between the transmitting laser beam and the field of view of the receiving telescope, the logarithmic range-adjusted power curve S(r) is fitted with conic, and the difference between the conic and the original S(r) in the short range is gotten. Secondly, the slope of curve S(r) in short range is obtained by fitting the curve S(r) in the long range on the assumption of an almost homogenous atmosphere. At last, by adding difference signal to the fitting line of S(r) in the short ange, the short-range S(r) is corrected. The correction results are close to the real atmospheric conditions.

关 键 词：大气光学 近场回波信号修正 距离校正函数 曲线拟合 

分 类 号：O433[机械工程—光学工程]