Multi-tap parallel-phase demodulation method to suppress the ambient light interference in MEMS scanning AMCW LiDAR

Seok-Jun An; Sung-Hyun Lee; Yoon-Seop Lim; Yong-Hwa Park

doi:10.1117/12.3002589

12 March 2024 Multi-tap parallel-phase demodulation method to suppress the ambient light interference in MEMS scanning AMCW LiDAR

Seok-Jun An, Sung-Hyun Lee, Yoon-Seop Lim, Yong-Hwa Park

Author Affiliations +

Proceedings Volume 12899, MOEMS and Miniaturized Systems XXIII; 1289909 (2024) https://doi.org/10.1117/12.3002589
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Light Detection and Ranging (LiDAR) sensors often encounter challenges with ambient light interference in outdoor settings, leading to depth measurement distortions. Traditional solutions involve additional hardware, causing cost, size, and optimization issues. This paper introduces a hardware-free approach: the multi-tap parallel-phase demodulation method with MEMS scanning LiDAR. Using on-off pulse-waveform modulation based on the amplitude-modulated continuous wave (AMCW) principle, the proposed method suppresses ambient light by multiplying sections of the received laser signal corresponding to off-modulation clock timing by zero. Controlling the duty ratio of the modulation signal drastically reduces ambient light, ideally reaching 1/10 to 1/100. To address harmonics error, this paper utilizes 20 taps to increase the dominant order of harmonics, naturally reducing depth errors. Experimental results demonstrate the efficacy of the method, reducing the original 8 mm depth standard deviation to less than 5 mm at 2.5 m. The cm-scale harmonics error is also reduced to the mm scale within the depth range of 1 m to 4 m. This method proves effective for suppressing ambient light interference in outdoor LiDAR applications.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Seok-Jun An, Sung-Hyun Lee, Yoon-Seop Lim, and Yong-Hwa Park "Multi-tap parallel-phase demodulation method to suppress the ambient light interference in MEMS scanning AMCW LiDAR", Proc. SPIE 12899, MOEMS and Miniaturized Systems XXIII, 1289909 (12 March 2024); https://doi.org/10.1117/12.3002589

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