激光雷达距离成像精度改进方法

A study of the method of improvement the accuracy of the range imaging of lidar

成像激光雷达是一种有源成像系统,使用脉冲激光发射器和面阵接收器产生3D距离图像,具有广范围精度和宽范围门等特性。文中通过静态弥散宽度对图像模糊的影响分析,提出了时间分辨信号分布模型和改进范围精度分析方法。通过激光雷达测距系统试验分析表明,利用该模型得到的最佳静态弥散宽度对距离成像精度有显著影响,能够在白天强背景环境下对室内和室外的10 m和1700 m目标进行距离成像。在室内成像中,当静态弥散宽度为43.4μm时获得的最优测距精度为0.06 m,在室外成像中,获得了测距误差为0.25 m的分米级3D图像。该方法能够有效地提高激光雷达成像距离和成像精度,从而提高交通流测距和测速的精度。

Imaging lidar is an active imaging system,which uses a pulse laser emitter and an area array receiver to generate 3D range images,and has the characteristics of high range accuracy and wide range gate.Based on the analysis of the influence of static dispersion width on image blur,a time-resolved signal distribution model and an analysis method of improvement range accuracy are proposed.The experimental analysis of lidar ranging system shows that the optimal static dispersion width obtained by this model has a significant impact on the accuracy of distance imaging,which can perform the range imaging between indoor and outdoor 10 m and 1700 m targets in a strong daytime environment.In indoor imaging,the optimal ranging accuracy obtained when the static dispersion width is 43.4μm is 0.06 m.In outdoor imaging,a decimeter-level 3D image with a ranging error of 0.25 m is obtained.This method can effectively improve the lidar imaging distance and imaging accuracy.