后向散射激光雷达是探测大气气溶胶空间分布的强有力手段，但由于盲区和过渡区的存在，限制了它在近距离段的探测范围和精度。基于电荷耦合器(CCD)的侧向散射激光雷达可实现近距离段气溶胶信号的连续探测，且探测精度较高。分析了侧向散射激光雷达中干扰光和背景光的特点，找到了减少它们的方法。分析了激光在大气中产生侧向散射光的特点，找到了同一距离处侧向散射光的叠加方法。应用Matlab编程实现了对信号的自动提取，并与后向散射激光雷达信号进行了实验比对，结果表明该信号提取方法是可靠的、可行的。

Backscattering lidar is a powerful tool for atmospheric aerosol detection, but the blind and transition regions restrict its detecting range and precision in near distance. Side-scatter lidar based on charge coupled device (CCD) can detect aerosol continuously in near distance with great precision. The characteristics of interference light and background light in side-scatter lidar are analyzed, and the way to decrease them is found. The characteristics of atmospheric scattering light generated by laser are analyzed, and the scattering light superposition from the same distance is computed. Matlab software is applied to retrieve signals, and the comparison between the proposed method and the backscattering lidar signals is made. The result indicates that this retrival method is reliable and feasible.