激光气象雷达多次后向散射信号特性分析

利用小角近似方法，分别给出了单次和多次后向散射激光雷达方程.通过引入的多次散射评价参量，分析了接收视场角和光学厚度等因素对多次后向散射信号的影响.理论研究表明:多次后向散射主要与接收视场角和光学厚度密切相关，当接收视场角比发射视场角大10倍，光学厚度超过3时, 多次后向散射信号逐渐增大并占主要优势，当接收视场角比发射视场角大100倍时，光学厚度超过1时，多次后向散射信号开始明显增强.

Characteristic of Multiply Backscattered Signal of Meteorological Lidar

Single and multiple backscattering lidar equations under the small angle approximation are presented.The effect of receiver field-of-view,optical thickness and other factors on multiple backscattering is analyzed by introducing a multiple scattering evaluation factor.Theoretical studies show that multiple scattering mainly depends on receiver field-of-view and optical thickness.When the receiver field-of-view is 10 times more than the transmitter the field-of-view,and the optical thickness is over 3,multiply backscattered signal gradually increases and becomes dominant.When the receiver field-of-view is 100 times more than the transmitter field-of-view,and the optical thickness is over 1,the multiply backscattered signal begins to dramatically increase.