脉冲激光测距系统在各个领域均有广泛应用，而时间测量 精度决定了距离测量精度。传统的时间测量方法都存在自身缺陷，难以实现精度高且 响应灵敏的脉冲时间间隔测量,因此详细介绍了一款时间数字转换芯片—— TDC-GP2芯片。该芯片利 用逻辑门延迟来实现高精度时间测量，其配合粗值计数器使用时的最大测量范围为4 ms。基于TDC-GP2芯片的 测量范围1可实现典型分辨率为50 ps (均方根值)、测量范围为0 ～ 1.8 s的 高精度时间间隔测量。该研究在各类测时方法中处于领先水平。

A pulsed laser ranging system has a wide range of applications in different fields and its ranging accuracy depends on its time measurement accuracy. Because of some shortcomings, it is difficult for a traditional time measurement method to implement pulsed time measurement with high accuracy and sensitivity. A time-to-digital converter chip TDC-GP2 is described in detail. The chip utilizes the delay of logic gates to implement high accuracy time measurement. When it is used with a coarse counter, its maximum measurement range is 4 ms. On the basis of range 1 of the TDC-GP2 chip, high accuracy time measurement with typical resolution of 50 ps RMS in a measurement range from 0 to 1.8 s can be implemented. This study is in a leading level among all kinds of time measurement methods.