百千赫兹量级测量重复频率和亚厘米量级测量精度的脉冲激光测距系统是激光测距领域的研究热点之一。分析研究了基于皮秒脉冲激光器的激光测距系统的实现原理和方法，针对激光脉宽极窄的特点，使用双阈值前沿时刻鉴别法和电压比较器输出数字信号的脉宽控制方法，并配合TDC-GPX高精度时间数字转换芯片，达到了设计要求。实验结果表明：测距系统工作稳定可靠，测量重复频率达到500 kHz，单次测距精度范围为[4 mm, 10 mm]。

The laser ranging system with hundreds of kilohertz measuring frequency and sub-centimeter level accuracy is one of the hotspots in the research of laser ranging. The principle and method of realizing laser ranging system are analyzed based on picosecond pulsed laser. According to the utmost narrow pulse width, the method of double thresholds leading-edge timing discrimination and width control method of digital signal generated by voltage comparator are applied. Coupled with high accuracy time to digital chip TDC-GPX, it can achieve the requirement of system. Experiments show that the system is stable and reliable, the measuring frequency can be up to 500 kHz, and the ranging accuracy is between 4 mm and 10 mm.