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Subsurface scattering layers detected by the airborne bathymetry lidar with segmented field-of-view receivers (Conference Presentation)

Paper Abstract

The airborne lidar with two segmented field-of-view (FOV) receivers was used to detect the subsurface scattering layers. Significant differences were observed in the waveforms from one channel with small FOV of 6 mrad and the other channel with larger FOV of 40-6 mrad. The larger FOV of 40-6 mrad was to provide a larger dynamic range for the deep-water signal detection. A small-angle approximation based Lidar waveform simulation model was developed, and found that these differences are owing to the narrow beam divergence of laser pulse of only 0.3 mrad. Next, an algorithm, which incorporates a waveform-decomposition technique and a lowpass digital differentiator, was then used to detect the scattering layers from both small- and large- FOV channels. The observation of scattering layer along the coastal region of Sanya Bay of China shows that, more than three thin scattering layers can be found in the same water column close to the coasts, and the maximum depth of the scattering layer detected by the large FOV Channel can be up to 35m, and internal waves can be detected from spatial distributions of scattering layer. It can be found that the airborne bathymetry lidar with segmented field-of-view receivers can also be a great tool for the subsurface scattering layer detection.

Paper Details

Date Published: 18 October 2019
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Proc. SPIE 11150, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019, 111500O (18 October 2019); doi: 10.1117/12.2532979
Show Author Affiliations
Bangyi Tao, The Second Institute of Oceanography, SOA (China)
Zhihua Mao, State Key Lab. of Satellite Ocean Environment Dynamics (China)
Yan He, Shanghai Institute of Optics and Fine Mechanics (China)
Shanjiang Hu, Shanghai Institute of Optics and Fine Mechanics (China)
Tiancheng Huang, State Key Lab. of Satellite Ocean Environment Dynamics (China)
Peng Chen, State Key Lab. of Satellite Ocean Environment Dynamics (China)


Published in SPIE Proceedings Vol. 11150:
Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019
Charles R. Bostater Jr.; Xavier Neyt; Françoise Viallefont-Robinet, Editor(s)

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