Results 21 to 30 of about 4,296,969 (159)

An estimation method of sound speed profile based on grouped dilated convolution informer model [PDF]

Frontiers in Marine Science
IntroductionThe accurate determination of the ocean sound speed profile (SSP) is essential for oceanographic research and marine engineering. Traditional methods for acquiring SSP data are often time-consuming and costly.
Siyuan Qin, Yi Zhang, Zhou Chen
doaj   +2 more sources

Bidirectional long short-term memory-based subsurface sound speed profile inversion from satellite data with sparse observations [PDF]

JASA Express Letters
Satellite-derived sea surface remote sensing data enable large-scale subsurface sound speed profile (SSP) inversion; however, considerable inversion errors commonly arise due to the lack of in situ constraints.
Bing Yue, Cheng Chen, Xiao Feng, Chuxiong Wang, Minghui Li, Fushi Bai   +5 more
doaj   +2 more sources

Inversion of Seawater Sound Speed Profile Based on Hamiltonian Monte Carlo Algorithm

Journal of Marine Science and Engineering
Inverting seawater sound speed profiles (SSPs) using Bayesian methods enables optimal parameter estimation and provides a quantitative assessment of uncertainty by analyzing the posterior distribution of target parameters.
Jiajia Zhao, Shuqing Ma, Qiang Lan
doaj   +2 more sources

A Statistical Optimization Method for Sound Speed Profiles Inversion in the South China Sea Based on Acoustic Stability Pre-Clustering

Applied Sciences
Aiming at the problem of accuracy degradation caused by the mixing of spatiotemporal disturbance patterns in sound speed profile (SSP) inversion using the traditional geographic grid division method, this study proposes an acoustic stability pre ...
Zixuan Zhang, Ke Qu, Zhanglong Li
doaj   +2 more sources

A Multi-Spatial-Scale Ocean Sound Speed Profile Prediction Model Based on a Spatio-Temporal Attention Mechanism

Journal of Marine Science and Engineering
Marine researchers rely heavily on ocean sound velocity, a crucial hydroacoustic environmental metric that exhibits large geographical and temporal changes.
Shuwen Wang, Ziyin Wu, Shuaidong Jia, Dineng Zhao, Jihong Shang, Mingwei Wang, Jieqiong Zhou, Xiaoming Qin   +7 more
doaj   +2 more sources

RASS sound speed profile (SSP) measurements for use in outdoor sound propagation models

IOP Conference Series: Earth and Environmental Science, 2008
The performance of outdoor sound propagation models depends to a great extent on meteorological input parameters. In an effort to improve speed and accuracy, model output synthetic sound speed profiles (SSP) are commonly used depending on meteorological classification schemes.
S G Bradley, S v Hünerbein, D Waddington   +2 more
openaire   +1 more source

Estimating Sound Speed Profile by Combining Satellite Data with In Situ Sea Surface Observations

, 2022
Given that spatiotemporal measurement of the subsurface profile over a wide range are difficult to obtain, surface observations from satellites are often used to estimate the sound speed profile (SSP).
Zhenyi Ou, Ke Qu, Yafen Wang, Jianbo Zhou   +3 more
core   +1 more source

Compensation of INS/LBL Navigation Errors in a Polynomial Sound-Speed-Profile [PDF]

, 2022
This paper presents an autonomous underwater vehicle (AUV) navigation scheme that pairs an inertial navigation system (INS) and a long baseline (LBL) acoustic positioning system.
Simamora, Yohannes Sampang Martua, Tjokronegoro, Harijono A., Leksono, Edi, Brodjonegoro, Irsan S., Edi Leksono, Yohannes Sampang Martua Simamora, Irsan S. Brodjonegoro, Harijono A. Tjokronegoro   +7 more
core   +1 more source

Source localization in shallow ocean using a deep learning approach with range-dependent sound speed profile modeling [PDF]

JASA Express Letters
Model-based deep learning approaches provide an alternative scheme to address the problem of the shortage of training data. However, performance degradation caused by sound speed profile (SSP) mismatch remains a critical challenge, particularly in ...
Jing Guo, Juan Zeng
doaj   +1 more source

2D BiLSTM Based Channel Impulse Response Estimator for Improving Throughput in Underwater Sensor Network

IEEE Access, 2022
In underwater acoustic (UWA) sensor network, the channel impulse response (CIR) at the transmitter is important to increase the link reliability and the throughput.
Yongcheol Kim, Hojun Lee, Seunghwan Seol, Jaehak Chung   +3 more
doaj   +1 more source