基于单光子阵列相机的激光测速

Laser Velocimetry Based on Single-Photon Array Camera

提出一种基于单光子阵列相机的激光测速方法,该方法可以在单光子量级的回波强度下,同时实现对目标横向速度和径向速度的测量。搭建了一套室内阵列测速激光雷达系统,验证了阵列时间相关单光子计数技术对运动目标进行横向和径向测速的可行性。通过信号预处理方法从空间和时间两个维度滤除背景噪声,利用质心检测和峰值检测确定目标的时变三维空间坐标,利用最小二乘法进行数据的线性拟合获得目标的横向和径向速度值。结果表明,帧积累数与最佳的测速性能有关。该方法可以在微弱的光照环境下实现对远距离运动目标的速度测量,未来还有望实现目标速度图像的获取,为远距离复杂运动目标的识别提供技术支撑。

A laser velocimetry method based on a single-photon array camera is proposed here.This approach can measure the lateral and radial velocity of a target simultenously under the single-photon echo intensity.A set of indoor array velocimetry lidar system is built to confirm the feasibility of array time-correlated single-photon counting technology for lateral and radial velocity measurement of moving targets.Background noise from the space and time dimensions is removed using signal preprocessing.The target's time-varying three-dimensional spatial coordinate is identified through centroid and peak detection and the target's lateral and radial velocity values are estimated using the least square method's linear fitting of the data.The result demonstrates that the frame accumulation number is associated with the best speed measurement performance.This method can measure the velocity of long-distance moving targets in poor light condition,and it is also expected to obtain a target velocity image in the future,giving technical support for the identification of longdistance complex moving targets.