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对于准同时发射两个波长激光的差分激光雷达,在测量时间内,大气波动对两个波长的激光回波信号的影响可能是不相同的。已有的大气修正方法是基于两个波长激光回波信号受到相同大气波动的基础之上,不适用于这种准同时的工作方式。提出了一种新的大气后向散射系数项修正方法,即利用Klett积分法,分别算出差分吸收激光雷达中两个波长激光的大气后向散射系数,得出大气后向散射系数修正项。这种方法应用于AML-2车载激光雷达测量臭氧的数据处理中,比对实验和大量的外场测量结果表明,这种修正方法是可行的、合理的。
For differential laser radars that emit both lasers at the same time, the influence of atmospheric fluctuations on the laser echo signals at two wavelengths may not be the same during the measurement time. Existing atmospheric correction methods are based on the fact that the two wavelength laser echo signals are subject to the same atmospheric fluctuations and are not suitable for this quasi-simultaneous operation. A new correction method of atmospheric backscatter coefficient is proposed, which uses Klett integral method to calculate the atmospheric backscattering coefficients of two wavelength lasers in differential absorption lidar respectively, and obtain the correction term of atmospheric backscattering coefficient. This method is applied to the data processing of ozone in the AML-2 car-lidar. The comparison experiment and a large number of outfield measurements show that this method is feasible and reasonable.