Laser ranging sensor measure the distance between sensor and target by calculating the flight time of laser pulse.So the precision of laser time interval is a basic beacon to measure the capability of the sensor.A special time-digital-converter chip is used to develop a high resolution time interval measurement module.The principle of the laser ranging of TDC—GP2 is introduced

and the software and hardware realization are presented as well.The test results show that the module has high measurement frequence.The time measurement precision of single pulse is less than 100 ps with good linearity

which can satisfy the requirements of speed measurement and precision in different applications.