Results 31 to 40 of about 4,296,969 (159)

Predictive Modeling of Future Full-Ocean Depth SSPs Utilizing Hierarchical Long Short-Term Memory Neural Networks

Journal of Marine Science and Engineering
The spatial-temporal distribution of underwater sound speed plays a critical role in determining the propagation mode of underwater acoustic signals. Therefore, rapid estimation and prediction of sound speed distribution are imperative for facilitating ...
Jiajun Lu, Hao Zhang, Pengfei Wu, Sijia Li, Wei Huang   +4 more
doaj   +1 more source

Influence of Sound Speed Profile on Source Localization at Different Depths

, 2017
The effect of sound speed profile (SSP) mismatch on source localization in shallow-water waveguides with a typical negative gradient (or thermocline) is studied numerically and experimentally.
L. Su, L. Ma, S. M. Guo
core   +1 more source

Frequency difference multi-branch multi-task learning for underwater source localization in mismatched environments [PDF]

JASA Express Letters
Model mismatches including array tilt and sound speed profile (SSP) mismatch are common in practice and degrade the performance of model-based deep learning methods for underwater source localization.
Jiati Li, Bin Wang, Qihang Xiao, Yuting Meng, Yiwang Huang   +4 more
doaj   +1 more source

Recursive ray acoustics for three-dimensional sound-speed profiles [PDF]

, 1991
A comparison of a simple recursive ray acoustics algorithm versus a ray acoustics algorithms based on solving a system of first-order ordinary differential equations was conducted.
Polnicky, F. Wynn
core   +2 more sources

Full-Depth Inversion of the Sound Speed Profile Using Remote Sensing Parameters via a Physics-Informed Neural Network

Remote Sensing
Due to the limited number of deep sound speed profile (SSP) samples, the existing wide-area SSP inversion methods cannot estimate the full-depth SSP. In this paper, the full-depth SSP inversion is achieved by adding physical mechanism constraints to the ...
Ke Qu, Zhanglong Li, Zixuan Zhang, Guangming Li   +3 more
doaj   +1 more source

Ocean Fronts and Their Acoustic Effects: A Review

Journal of Marine Science and Engineering, 2022
As one of the widespread physical phenomena in the global ocean system, the ocean front has a very important influence on underwater sound propagation.
Yuyao Liu, Zhou Meng, Wen Chen, Yan Liang, Wei Chen, Yu Chen   +5 more
doaj   +1 more source

Robust seafloor reference point positioning for Underwater Acoustic Internet of Things via joint inversion of systematic errors and equivalent sound speed profile

Array
High-precision positioning of seafloor reference points is fundamental to the Underwater Acoustic Internet of Things (UA-IoT), where stable and reliable geospatial anchor nodes support underwater sensing, navigation, maintenance, and infrastructure ...
Yuhong Zheng, Wanliang Zhang, Jian Shi, Jiayi Xu, Shui Pang, Wenke Duan   +5 more
doaj   +1 more source

Characterization of sound speed profile in Malaysian Sea [PDF]

, 2013
The propagation of sound in the sea is dependent on several environmental factors such as the depth and some other ocean properties. The characteristics of sound propagation in the sea are determined by the sound speed profile. The sound speed in the sea
Ali Wardere, Abdirahim Kalif
core  

Linear approximation of underwater sound speed profile: Precision analysis in direct and inverse problems

, 2018
Sound speed is one of the key sources of uncertainty in an underwater environment. The wave equation for a complex sound speed profile (SSP) cannot be analytically solved and numerical solutions generally involve high computational costs.
Xun Wang, Shahram Khazaie, Khazaie, Shahram, Xue Chen, Wang, Xun, Chen, Xue   +5 more
core   +1 more source

Design and Implementation of an Automated Wheelchair With Voice and Gesture Control, Obstacle Avoidance, and Real‐Time Location Sharing

Engineering Reports, Volume 8, Issue 11, November 2026.
This work presents a standalone smart wheelchair featuring dual voice‐ and gesture‐based control, obstacle avoidance, and real‐time location sharing. The system achieves 100% gesture accuracy and 94% voice accuracy, enabling safe, independent mobility for users with severe physical impairments and providing emergency support without smartphone ...
Md Nurul Huda Rifat, S. M. Fatin Hasnat, Md. Habibur Rahman Aslam   +2 more
wiley   +1 more source