为了提高机场泊位引导系统中激光测距的精度和频率，对测距方法、脉冲展宽的影响、系统接收信噪比、接收带宽、阈值设定方法等几个方面进行了研究。通过改进自触发脉冲飞行时间激光测距法，提高发射信号峰值功率，采用合适滤波器、减小接收系统带宽、设置自适应阈值等手段有效提高了测距系统对近程运动目标的测距性能。采用半实物仿真手段进行动态测距实验，结果表明，测距机的动态测量精度小于2cm，满足泊位系统测距性能的要求。

In order to improve laser ranging accuracy and frequency of docking guidance system, several aspects were researched on the methods of distance measurement, the influence of the pulse spreading, the received SNR, the receiver bandwidth and the methods of threshold setting. The ranging performance of short-range moving targets was improved by improving the self-triggering pulsed time-of-flight laser ranging method, increasing the peak power of radio signal, using the appropriate filter, reducing the bandwidth of the receiving system and setting the adaptive threshold. Finally, the semi-physical simulation experiment was adopted to test the system's ranging performance, and the results show that the dynamic ranging accuracy is less than 2cm which meets the design requirement of docking guidance system.