Author Affiliations
Abstract
1 National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
2 Heilongjiang Institute of Technology, Harbin 150050, China
The work proposes a three-laser-beam streak tube imaging lidar system. Besides the main measuring laser beam, the second beam is used to decrease the error of time synchronization. The third beam has n+0.5 pixels’ difference compared to the main measuring beam on a CCD, and it is used to correct the error caused by CCD discrete sampling. A three-dimensional (3D) imaging experiment using this scheme is carried out with time bin size of 0.066 ns (i.e., corresponding to a distance of 9.9 mm). An image of a 3D model is obtained with the depth resolution of <2 mm, which corresponds to ～0.2 pixel.
110.6880 Three-dimensional image acquisition 280.3640 Lidar Chinese Optics Letters
2018, 16(4): 041101
哈尔滨工业大学 可调谐激光技术国家级重点实验室, 黑龙江 哈尔滨 150080
条纹阵列探测激光雷达具有测距精度高、作用距离远、探测景深宽和数据更新率高等显著优点, 已被广泛应用于地形测绘、海岸带监测、城市三维重构、森林生态研究等领域中。传统的信号鉴别方法在回波信号距离提取过程中存在一定的局限性, 影响了条纹阵列探测激光雷达的距离分辨能力和目标识别能力。针对这一问题在处理条纹图像时引入了一种迭代加权质心算法, 讨论了该算法在质心定位中的独特优越性, 结合条纹阵列探测激光雷达的信号分布特征确定了该算法中关键参数的选取。利用该算法在1.4 km的作用距离下获得了具有清晰边界特征的目标距离像, 有效抑制了距离提取过程中产生的边界模糊效应, 显著提升了系统的细节分辨能力, 相比于传统的质心算法, 测距精度提高了17%。
激光雷达 条纹阵列探测器 测距精度 质心算法 lidar streak array detector ranging accuracy centroid algorithm 红外与激光工程
2018, 47(2): 0230004
Author Affiliations
Abstract
1 National Key Laboratory of Science and Technology on Tunable laser, Harbin Institute of Technology, Harbin 150080, China
2 College of Foundation Science, Harbin University of Commerce, Harbin 150028, China
Streak tube imaging lidar (STIL) is an active imaging system that has a high range accuracy with the use of a pulsed laser transmitter and streak tube receiver to produce 3D range images. This work investigates the effect of the time bin size on the range accuracy of STIL systems based on the peak detection algorithm. The numerical simulation indicates that the time bin size has a significant effect on the range accuracy, resulting in a modified analytical estimate of the range error. An indoor experiment with a planar target is carried out to validate the theory that shows the linear relationship between the range error and the time bin size. Finer 3D depth images of a fist model are acquired by using a smaller time bin size and the best range error of 0.003 m is achieved with the optimal time bin size of 0.07 ns.
110.6880 Three-dimensional image acquisition 280.3640 Lidar 150.5670 Range finding 280.4788 Optical sensing and sensors Chinese Optics Letters
2016, 14(2): 021101
1 哈尔滨工业大学可调谐激光技术国家级重点实验室, 黑龙江 哈尔滨 150001
2 哈尔滨工业大学软件学院, 黑龙江 哈尔滨 150001
对不同信噪比条件下条纹原理的阵列探测器获得的激光雷达回波实验信号的测绘误差进行了分析并获得了激光回波信噪比对激光雷达测绘精度影响的实验规律，并对该种探测系统的背景噪声特性进行了研究，在此基础上建立了条纹原理的阵列探测体制激光成像雷达测绘仿真系统。通过该仿真系统对实验过程进行了模拟，获得了与实验结果相同的激光回波信噪比对激光雷达测绘精度影响变化规律曲线。利用该仿真系统可以根据测绘精度的要求对条纹原理的阵列探测体制激光成像雷达进行设计。
探测器 激光雷达 信噪比 测绘精度 光学学报
2014, 34(s2): s228002
