脉冲激光测距误差标定及不确定度分析

Calibration Method and Uncertainty Analyses of Pulse Laser Ranging Error

以脉冲激光测距机的测距误差标定为背景,通过对测距误差解析表达式的推导,给出了系统各不确定度分量对测距误差的影响,计算了信号延迟时间、探测器和激光二极管响应时间、晶振频率、大气折射率等不确定度分量。通过对某已标定激光测距机实验验证表明:该装置在500m^20 000m测距范围内,测量重复性引入的相对标准不确定度最大值为0.67m,满足该类激光测距机测量不确定度5m(k=2)的校准测试需求。因此,利用该解析表达式可以实现对脉冲激光测距误差的有效评估,这对于脉冲激光测距测试系统、脉冲激光测距机的设计具有重要的指导意义。

Taking the pulse laser rangefinder for ranging error as application background,in this paper,the analytic form of the ranging error was given,and the impact of uncertainty to ranging error were presented according to the formula. Meanwhile,the uncertainty of the signal delay,response of detector and laser diode, crystal oscillator frequency, refractive index of air is calculated. A laser rangefinder was selected as the experimental object and the distance was tested at 500 m - 20000 m. The experimental showed that the max relative standard uncertainty was 0. 67 m belong to test repeatability. It can meet the uncertainty 5m（ k = 2） ranging calibration. The performance of ranging error device can be effectively assessed with this formula,and it is of important guiding significance for the laser rangefinder and laser ranging error design.