Development of a Lightweight Single-Band Bathymetric LiDAR

Traditional bathymetry LiDAR (light detection and ranging) onboard manned and/or unmanned airborne systems cannot operate in the context of narrow rivers in urban areas with high buildings and in mountainous areas with high peaks. Therefore, this study presents a prototype of a lightweight bathymetr...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Switzerland), 2022-11, Vol.14 (22), p.5880
Main Authors: Zhou, Guoqing, Zhou, Xiang, Li, Weihao, Zhao, Dawei, Song, Bo, Xu, Chao, Zhang, Haotian, Liu, Zhexian, Xu, Jiasheng, Lin, Gangchao, Deng, Ronghua, Hu, Haocheng, Tan, Yizhi, Lin, Jinchun, Yang, Jiazhi, Nong, Xueqin, Li, Chenyang, Zhao, Yiqiang, Wang, Cheng, Zhang, Lieping, Zou, Liping
Format: Article
Language:English
Subjects:
Accuracy
Aircraft
Algorithms
Bathymeters
Bathymetry
Data acquisition
Data processing
Lasers
LiDAR
Lightweight
Modules
Mountain regions
Mountainous areas
Photomultiplier tubes
Receiving
Scanners
system implementation
underwater topographic survey
Unmanned aerial vehicles
unmanned shipboard
Urban areas
Vehicles
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Summary:Traditional bathymetry LiDAR (light detection and ranging) onboard manned and/or unmanned airborne systems cannot operate in the context of narrow rivers in urban areas with high buildings and in mountainous areas with high peaks. Therefore, this study presents a prototype of a lightweight bathymetry LiDAR onboard an unmanned shipborne vehicle (called “GQ-Cor 19”). The GQ-Cor 19 system primarily includes an emitting optical module, a receiving optical module, control module, detection module, high-speed A/D sampling module, and data processing system. Considering that the “GQ-Cor 19” is extremely close to the water surface, various new technical challenges are encountered, such as significant laser scattering energy from the surface of the water, which saturates signals received by the photomultiplier tube detector. Therefore, this study presents various new technical solutions, including (1) an improved Bresenham algorithm, (2) a small and lightweight receiving optical system with a split-field method, and (3) a data acquisition module with a high-speech A/D collector. Following a series of different experimental verifications, the results demonstrate that the new generation of single-band LiDAR onboard an unmanned shipborne vehicle can swiftly measure the underwater depth, and the maximum measurement depth is more than 25 m. The measurement accuracy is better than 30 cm and the weight is less than 12 kg.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs14225880