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首页> 外文期刊>Optics and Lasers in Engineering >Improvement of detection probability and ranging performance of Gm-APD LiDAR with spatial correlation and adaptive adjustment of the aperture diameter
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Improvement of detection probability and ranging performance of Gm-APD LiDAR with spatial correlation and adaptive adjustment of the aperture diameter

机译：改进GM-APD激光雷达的检测概率和测距性能，具有空间相关性和孔径的自适应调节

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摘要

Gm-APD (Geiger-mode avalanche photodiode) is widely used in the LiDAR (Light detection and ranging) system for its excellent photon detection capability. The triggering probability of Gm-APD is closely dependent on the absolute intensity and the signal-to-noise ratio (SNR) of the echo, which limits the detection results in the daytime. In order to improve target's detection probability under a limited amount of statistics in the daytime, it proposed a detection scheme by using the spatial correlation and adaptive adjustment of the aperture diameter (AAAD) to achieve optimal target detection results in the daytime, besides, a MLE (Maximum Likelyhood Estimation) based ranging walk-error correction method was also put forward for the limited number of measurement. Firstly, considering the strategies of AAAD and spatial correlation, as well as the LiDAR ranging equation and Poisson triggering probability model, the detection probability model and ranging performance model of the scheme of spatial correlation and AAAD were built in this paper. Subsequently, the detection probability and ranging performance of the proposed scheme were theoretically analyzed, besides, a ranging walk-error correction strategy was put forward based on the MLE method. The theoretical analysis results showed that the proposed detection scheme could increase the utilization of echo photons and improve the amount of echo's triggering statistics; moreover, the Monte Carlo simulation results showed that in the case of a limited amount of statistics, the target detection scheme and ranging walk-error correction strategy could effectively improve the target detection probability and obtain a smaller ranging walk-error than the traditional detection scheme. Finally, the Gm-APD LiDAR was used to experimentally verify the proposed scheme, and the results showed that the scheme could effectively improve the echo's triggering probability with 400 measurements; the indoor experiment showed that the triggering probability could be improved by 7.54 times at most for white wall, and the white wall's target restoration ratio could reach 100% which was enhanced by more than 100%; besides, the outdoor experiment in the daytime showed that the target's restoration ratio could reach 75.54% and 99.45% for two investigated regions which were enhanced by 659.2% and 57.4%. Moreover, a high ranging accuracy could be maintained through ranging walk-error correction strategy, ranging walk-errors of -9mm, 12mm and 14mm under 400 measurements were achieved for white wall, concrete slab and black paper respectively. It effectively improved the ranging performance compared with the traditional detection scheme, and it completely satisfied the far-range detection. This paper can provide effective solutions for laser detection and ranging with Gm-APD in the daytime.
机译：GM-APD（Geiger-Mode Avalanche Photiode）广泛用于LIDAR（光检测和测距）系统，以实现其优异的光子检测能力。 GM-APD的触发概率紧密依赖于回声的绝对强度和信噪比（SNR），这限制了日间的检测结果。为了在白天在有限的统计数据中提高目标的检测概率，提出了通过使用空间相关性和孔径直径（AAAD）的自适应调节来实现最佳目标检测结果，此外，除了基于MLE（最大可能性估计）的测距误差校正方法也提出了有限数量的测量。首先，考虑到AAAD和空间相关的策略，以及LIDAR测距方程和泊松触发概率模型，在本文中建立了空间相关性和AAAD方案的检测概率模型和测距模型。随后，基于MLE方法向外分析了所提出的方案的检测概率和测距性能，并提出了一种测距误差校正策略。理论分析结果表明，所提出的检测方案可以增加回波光子的利用，提高回声触发统计量;此外，蒙特卡罗仿真结果表明，在有限量的统计情况下，目标检测方案和测距误差校正策略可以有效地提高目标检测概率并获得比传统检测方案更小的测距误差。最后，GM-APD LIDAR用于实验验证所提出的方案，结果表明，该方案可以有效地改善了400次测量的回波触发概率;室内实验表明，对于白墙最多，触发概率可以提高7.54倍，白墙的目标恢复比率可以达到100％以上增强的100％;此外，白天的户外实验表明，两种调查区域的恢复比率达到75.54％和99.45％，增强了659.2％和57.4％。此外，通过测距误差校正策略可以保持高测距精度，为29mm，1200mm和14mm的测距误差分别为白色墙壁，混凝土板和黑色纸张实现了-9mm，12mm和14mm。它有效地改善了与传统检测方案相比的测距性能，并且完全满足远程检测。本文可以为白天的激光检测和GM-APD提供有效的解决方案。

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  • 来源
    《Optics and Lasers in Engineering》 |2021年第3期|106452.1-106452.11|共11页
  • 作者

    Zhou Xin; Sun Jianfeng; Jiang Peng; Qiu Changrui; Wang Qi;

  • 作者单位

    Harbin Inst Technol Inst Optoelect Natl Key Lab Sci & Technol Tunable Laser Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Inst Optoelect Natl Key Lab Sci & Technol Tunable Laser Harbin 150001 Heilongjiang Peoples R China;

    Sci & Technol Complex Syst Control & Intelligent Beijing 100074 Peoples R China;

    Harbin Inst Technol Inst Optoelect Natl Key Lab Sci & Technol Tunable Laser Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Inst Optoelect Natl Key Lab Sci & Technol Tunable Laser Harbin 150001 Heilongjiang Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gm-APD; Spatial correlation; AAAD; Ranging walk-error correction;

    机译：GM-APD;空间相关;AAAD;测距步行纠错;

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