Results 31 to 40 of about 17,635,438 (201)

Batch Processing through Particle Swarm Optimization for Target Motion Analysis with Bottom Bounce Underwater Acoustic Signals

Sensors, 2020
A target angular information in 3-dimensional space consists of an elevation angle and azimuth angle. Acoustic signals propagating along multiple paths in underwater environments usually have different elevation angles.
Raegeun Oh, Taek Lyul Song, Jee Woong Choi   +2 more
doaj   +1 more source

Estimation on the Underwater Explosion Equivalent Based on the Threshold Monitoring Technique

Shock and Vibration, 2021
Underwater nuclear explosions can be monitored in near real-time by the hydroacoustic network of the International Monitoring System (IMS) established by the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which could also be used to monitor underground ...
Yan Wang, Xiaoming Wang, Zhehan Liu, Wei Tang, Jian Li, De Nan, Shiya Zou   +6 more
doaj   +1 more source

Frequency Analysis of Acoustic Data Using Multiple-Measurement Sparse Bayesian Learning

Sensors, 2021
Passive sonar systems are used to detect the acoustic signals that are radiated from marine objects (e.g., surface ships, submarines, etc.), and an accurate estimation of the frequency components is crucial to the target detection.
Myoungin Shin, Wooyoung Hong, Keunhwa Lee, Youngmin Choo   +3 more
doaj   +1 more source

Validation of the F-POD-A fully automated cetacean monitoring system.

PLoS ONE, 2023
The F-POD, an echolocation-click logging device, is commonly used for passive acoustic monitoring of cetaceans. This paper presents the first assessment of the error-rate of fully automated analysis by this system, a description of the F-POD hardware ...
Julia Ivanchikova, Nicholas Tregenza
doaj   +1 more source

Research advances and development trends in acoustic target detection

Zhongguo Jianchuan Yanjiu
Underwater target detection faces severe challenges due to the enhanced acoustic stealth capabilities of targets and the anomalous sound propagation phenomena within complex ocean waveguides.
Yixin YANG, Lei XIE, Long YANG, Yong WANG, Lu WANG, Yuqi LIU   +5 more
doaj   +1 more source

A Deep-Learning Based Pipeline for Estimating the Abundance and Size of Aquatic Organisms in an Unconstrained Underwater Environment from Continuously Captured Stereo Video

Sensors, 2023
The utilization of stationary underwater cameras is a modern and well-adapted approach to provide a continuous and cost-effective long-term solution to monitor underwater habitats of particular interest.
Gordon Böer, Joachim Paul Gröger, Sabah Badri-Höher, Boris Cisewski, Helge Renkewitz, Felix Mittermayer, Tobias Strickmann, Hauke Schramm   +7 more
doaj   +1 more source

Effective beam pattern of the Blainville's beaked whale (Mesoplodon densirostris) and implications for passive acoustic monitoring [PDF]

, 2013
This work was funded by two partners under the National Oceanographic Partnership Program: the Ocean Acoustics Program of the U.S. National Marine Fisheries Service, Office of Protected Resources, and the International Association of Oil and Gas ...
Johnson, Mark, David Moretti, Susan Jarvis, Peter Tyack, Moretti, David, Shaffer, Jessica Ward, Jessica Ward Shaffer, Jarvis, Susan, Tyack, Peter, Mark Johnson   +9 more
core   +1 more source

The effects of sound propagation and avoidance behaviour on naval sonar levels received by cetaceans [PDF]

, 2012
The use of active sonar is deemed to be essential for naval operations, but its potential impact on marine life has raised concerns worldwide. In a risk-assessment framework, characterisation of risk of harm is accomplished by combining exposure ...
Wensveen, Paul J.
core   +2 more sources

An Improved Azimuth Angle Estimation Method with a Single Acoustic Vector Sensor Based on an Active Sonar Detection System

Sensors, 2017
In this paper, an improved azimuth angle estimation method with a single acoustic vector sensor (AVS) is proposed based on matched filtering theory. The proposed method is mainly applied in an active sonar detection system.
Anbang Zhao, Lin Ma, Xuefei Ma, Juan Hui
doaj   +1 more source

Performance analyses of naval ships based on engineering level of simulation at the initial design stage

International Journal of Naval Architecture and Ocean Engineering, 2017
Naval ships are assigned many and varied missions. Their performance is critical for mission success, and depends on the specifications of the components. This is why performance analyses of naval ships are required at the initial design stage. Since the
Dong-Hoon Jeong, Myung-Il Roh, Seung-Ho Ham, Chan-Young Lee   +3 more
doaj   +1 more source