Results 1 to 10 of about 166,209 (277)

3D Object Recognition Based on Point Clouds in Underwater Environment with Global Descriptors: A Survey [PDF]

open access: yesSensors, 2019
This paper addresses the problem of object recognition from colorless 3D point clouds in underwater environments. It presents a performance comparison of state-of-the-art global descriptors, which are readily available as open source code.
Khadidja Himri, Pere Ridao, Nuno Gracias
doaj   +2 more sources

Environment sensing technology of underwater ROV based on artificial siding. [PDF]

open access: yesPLoS ONE
The underwater environment has the characteristics of high pressure and low temperature, which limits the performance of the sensor, and there are inaccuracies or distortions in the measurement data, resulting in errors and uncertainties in the ...
Wenhui Wang, Fumeng Ye, Rufei He
doaj   +2 more sources

Passive depth estimation for a narrowband source using a single vector sensor in deep water [PDF]

open access: yesJASA Express Letters, 2023
For a narrowband signal, an oscillating interference pattern is formed with a target's moving when receiving at the bottom of the sea. In this Letter, the interference pattern of a narrowband source is observed using a single vector sensor (SVS).
He Li   +5 more
doaj   +1 more source

A Hybrid–Source Ranging Method in Shallow Water Using Modal Dispersion Based on Deep Learning

open access: yesJournal of Marine Science and Engineering, 2023
The relationship between modal elevation angle and the relative arrival time between modes, derived from exploiting modal dispersion, provides source information that is less susceptible to environmental influences.
Tong Wang   +5 more
doaj   +1 more source

Estimating the parameters of the seabed using the spatial characteristics of ocean ambient noise [PDF]

open access: yesMATEC Web of Conferences, 2019
When solving traditional underwater problems, the boundary condition is always used to calculate the sound field. In practice, however, it is hard to get the boundary conditions of the seabed. So geoacoustics inversion is needed to acquire the parameters
Li He, Guo Xiniyi, Ma Li, Song Guoli
doaj   +1 more source

Underwater Optical Image Restoration Method for Natural/Artificial Light

open access: yesJournal of Marine Science and Engineering, 2023
This paper investigates the underwater optical image restoration method under the background of underwater target detection based on optical vision in AUVs.
Tianchi Zhang   +3 more
doaj   +1 more source

Autonomous Underwater Vehicle Path Planning Method of Soft Actor–Critic Based on Game Training

open access: yesJournal of Marine Science and Engineering, 2022
This study aims to solve the issue of the safe navigation of autonomous underwater vehicles (AUVs) in an unknown underwater environment. AUV will encounter canyons, rocks, reefs, fish, and underwater vehicles that threaten its safety during underwater ...
Zhuo Wang   +3 more
doaj   +1 more source

Virtual Underwater Datasets for Autonomous Inspections

open access: yesJournal of Marine Science and Engineering, 2022
Underwater Vehicles have become more sophisticated, driven by the off-shore sector and the scientific community’s rapid advancements in underwater operations.
Ioannis Polymenis   +3 more
doaj   +1 more source

Reactive Control for Collision Evasion with Extended Obstacles

open access: yesSensors, 2022
Evading collisions in three-dimensional underwater environments is critical in exploration of an Autonomous Underwater Vehicle (AUV). In underwater environments, AUV measures an obstacle surface by utilizing a three-dimensional active sonar. This article
Jonghoek Kim
doaj   +1 more source

DANAE++: A Smart Approach for Denoising Underwater Attitude Estimation

open access: yesSensors, 2021
One of the main issues for the navigation of underwater robots consists in accurate vehicle positioning, which heavily depends on the orientation estimation phase.
Paolo Russo   +2 more
doaj   +1 more source

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