Real-time and high-precision ranging method for large dynamic range of imaging lidar

被引：0
|
作者：
Bai Y. [1 ]
Tang W. [1 ]
Xu S. [1 ]
Yang Z. [1 ]
Lv M. [1 ]
Yu C. [1 ]
Gao J. [1 ]
Zheng J. [1 ]
Liu Y. [1 ]
Qin Y. [1 ]
机构：
[1] Southwest Institute of Technology and Physics, Chengdu
来源：
Gao, Jianbo (gaojbjr@126.com) | 1600年 / Chinese Society of Astronautics卷 / 49期
关键词：
Full waveform ranging; Imaging lidar; Large dynamic ranging; Waveform matching;
D O I：
10.3788/IRLA20200179
中图分类号：
学科分类号：
摘要：
In order to meet the application needs of unmanned driving and vehicle obstacle avoidance, imaging lidar usually needs to identify target signals in a large dynamic range of several meters to several hundred meters. Limited by volume and cost, lidar usually does not have automatic gain control function. Therefore, high precision measurement of saturated to unsaturated echo signals is one of the problems that imaging lidar needs to solve. Traditional imaging lidars mostly use the TDC method. This method is effective for the saturated waveforms of the targets nearby, but has limited imaging ability for unsaturated echo signals far away. Therefore, a method of full waveform matching based on high speed ADC was proposed. The high-precision peak position of the echo pulse was obtained by sliding matching the echo pulse and the template waveform. And an optimized fast algorithm on FPGA was implemented, which improved the execution speed. The accuracy of ranging was ensured and the effective imaging range of the imaging lidar was increased. Through a large number of experiments, the imaging lidar has a ranging accuracy of 2.7 cm and an effective imaging range of more than 200 meters. © 2020, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
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  • [1] Dai Qin, Geng Yue, Li Yeqiu, Et al., High-precision measurement technology of laser pulse flight time based on TDC-GP21, Infrared and Laser Engineering, 42, 7, pp. 1706-1709, (2013)
  • [2] Feng Zhihui, Liu Enhai, Yue Yongjian, High-accuracy TDC for laser range finder, Optics and Precision Engineering, 37, 4, pp. 53-59, (2010)
  • [3] Amann M C, Bosch T M, Lescure M, Et al., Laser ranging: a critical review of unusual techniques for distance measurement, Opt En, 40, pp. 10-19, (2001)
  • [4] Zhu Shixian, Zhao Yiqiang, Ye Mao, Et al., Saturated echo signal algorithm for wide dynamic range lidar, Acta Photonica Sinica, 47, 12, (2018)
  • [5] Wang Huang, Li Song, Zhou Hui, Impaction of Gauss fitting-error on ranging precision, Infrared and Laser Engineering, 35, 3, pp. 318-321, (2006)
  • [6] Ji Rongyi, Zhao Changming, Ren Xuecheng, Study of timing discriminator for pulsed laser rangefinder, Infrared, 31, 11, pp. 34-37, (2010)
  • [7] Xie Gengcheng, Ye Yidong, Li Jianming, Et al., Echo characteristics and range error for pulse laser ranging, Chinese Journal of Lasers, 45, 6, (2018)
  • [8] Lim H., Constant fraction discriminator involving automatic gain control to reduce time walk, IEEE Transactions on Nuclear Science, 61, 4, pp. 2351-2356, (2014)
  • [9] Nissinen J, Nissinen I, Kostamovaara J., Integrated receiver including both receiver channel and TDC for a pulsed time-of-flight laser rangefinder with cm-level accuracy, IEEE Journal of Solid-state Circuits, 44, 5, pp. 1486-1497, (2009)
  • [10] Reitberger J, Krzystek P, Stilla U., Analysis of full waveform LIDAR data for the classification of deciduous and coniferous trees, International Journal of Remote Sensing, 29, 5, pp. 1407-1431, (2008)
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