Restrain range walk error of Gm-APD lidar to acquire high-precision 3D image; [距离漂移误差抑制获取Gm-APD激光雷达高精度三维像]

被引：0

作者：

Xu L. ^{[1
]}

Yang X. ^{[1
]}

Wu L. ^{[1
]}

Bao X. ^{[1
]}

Zhang Y. ^{[1
]}

机构：

[1] School of Informatics, Zhejiang Sci-Tech University, Hangzhou

来源：

Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2020年 / 49卷 / 10期

关键词：

3D imaging; Lidar; Photon counting; Poisson statistics; Rang walk error;

D O I：

10.3788/IRLA20200218

中图分类号：

学科分类号：

摘要：

Due to the first photon bias effect of Gm-APD, there exists range walk error in Gm-APD lidar, which will generate a distortion of depth image of the target. Two methods to restrain the range walk error were presented and verified by experiments. Signal restoration method was used to obtain signal photoelectron distribution histogram (SPDH) from the photon counting distribution histogram (PCDH). A sum of two Gaussian functions were used to fit the SPDH through, and the peak position of the curve was found to calculate the distance. The center-of-mass algorithm method on the SPDH was used to calculate the distance through the second method. The high-precision 3D depth-intensity merged images was caputured using the two methods by experiments with a 6 ns width laser pulse. The relative accuracy of intensity measurement of the two methods were both less than 3%. The signal restoration & Gaussian functions fitting method has range precision of 1.2 cm. The signal restoration & center-of-mass algorithm method has range precision of 0.6 cm. Copyright ©2020 Infrared and Laser Engineering. All rights reserved.

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