基于时间相关单光子计数技术的测速研究

Research on velocity measurement based on time-correlated single photon counting

传统的激光雷达通常采用多普勒效应获得目标的径向速度,但是当回波信号低到单光子水平时就难以实现这种功能。文中探索利用时间相关单光子计数(TCSPC)技术实现测速的方法。搭建了一套高重频、高精度的TCSPC测速系统并开展了实验研究。结果表明,在一定的测速时长下测速误差与单次测距光子计数直接相关,在文中实验条件下单次测距光子计数在1000~5000个时测速误差达到最优。该方法未来有望代替多普勒测速方法,实现对远距离高速运动目标的测速。

The traditional lidar usually uses Doppler effect to obtain the radial velocity of the target,but it is difficult to achieve this function when the echo signal is as low as single photon level.In this paper,we explore a method of velocity measurement using time-correlated single photon counting(TCSPC)technology.We have built a high repetition rate and high precision TCSPC velocity measurement system and carried out experimental research.The results show that the velocity measurement error is directly related to the photon count for single ranging under a certain velocity measurement duration,and the velocity measurement error is optimal when the photon count for single ranging is 1000-5000 under the experimental conditions in this paper.This method is expected to replace the Doppler velocity measurement method in the future and realize the velocity measurement of long-distance and high-speed moving targets.