根据激光雷达原理并结合实际实验经验，设计了一套在计算机程序控制下的激光雷达光束自动准直系统。通过控制激光发射导向镜的位置，使激光在东西和南北方向扫描，对接收到的回波信号分析处理，得到最后方位使收发系统平行。操作过程每次只需10-20 min，精度可达到0.1 mrad。系统应用到大气温度监测中，将测量计算结果与模式CIRA86数据进行对比分析表明，反演高度30-45 km处误差1-3 K，45-65 km处误差2-5 K。

According to principle of lidar and experiences, the automatic alignment system of lidar beam controlled by computer procedure has been designed. By controlling the position of gimbal-mounted mirror, the direction of light beam scanning was east-west and south-north. Echo signals were analyzed, and final position was obtained to make transmitting and receiving systems parallel. The process needs 10-20 min for once, and accuracy is about 0.1 mrad. In atmospheric temperture monitoring, measuring results compared with CIRA86 data. The error of altitude at 30-45 km is 1-3 K, 2-5 K for 45-65 km.