侧向散射激光雷达反演气溶胶后向散射系数误差分析

Analysis of Aerosol Backscatter Coefficient Error in Side-scatter Lidar Data Processing

气溶胶的光学特性是大气探测的一个重要部分,侧向散射激光雷达很适合于探测近地面大气气溶胶光学特性。在侧向散射激光雷达的反演公式中,气溶胶后向散射系数对各直接测量量偏导数的解析表达式是求不出的,传统的误差传递公式难以发挥作用。而直接误差传递的方法,适应于这种情况。用直接误差传递方法估算参考点气溶胶后向散射系数、大气后向散射系数、气溶胶消光后向散射系数比、测量信号、大气分子和气溶胶比相函数分别独立变化时引起后向散射系数误差的大小及总误差的大小。

Aerosol optical characteristic is an important part in atmospheric detectmn, and side-scatter lidar is very suitable for detecting it in rear range. In the inversion formula of side-scatter equation, it is difficult to calculate that the partial derivative of aerosol backscatter coefficient for direct measuring variables, and the conventional error transfer formula can not be applied. A direct error formula is fit to this case. This direct error formula can be applied to estimation of aerosol backscatter coefficient total error from aerosol backscatter coefficient error at reference point, molecular backscattering coefficient error, aerosol extinction to backscatter ratio error, measuring signal error, molecular and aerosol phase function ratio error in lidar data processing.