Results 21 to 30 of about 1,232 (173)

Acoustical characteristic predictions of a multi-layer system of a submerged vehicle hull mounted sonar simplified to an infinite planar model

International Journal of Naval Architecture and Ocean Engineering, 2012
Hull Mounted Sonar (HMS) is a long range submerged vehicle's hull-mounted passive sonar system which detects low-frequency noise caused by machineries of enemy ships or submerged vehicles.
Sung-Hee Kim, Suk-Yoon Hong, Jee-Hun Song, Hyun-Gwon Kil, Jae Jin Jeon, Young-Soo Seo   +5 more
doaj   +1 more source

Underwater Acoustic Research Trends with Machine Learning: Passive SONAR Applications

한국해양공학회지, 2020
Underwater acoustics, which is the domain that addresses phenomena related to the generation, propagation, and reception of sound waves in water, has been applied mainly in the research on the use of sound navigation and ranging (SONAR) systems for ...
Haesang Yang, Keunhwa Lee, Youngmin Choo, Kookhyun Kim   +3 more
doaj   +1 more source

Passive sonar automated target classifier for shallow waters using end-to-end learnable deep convolutional LSTMs

Engineering Science and Technology, an International Journal, 2021
Automated target recognition systems are increasingly employed in sonar systems to reduce manning and associated challenges. Although passive acoustic target recognition is an exceptionally challenging endeavor especially in shallow water scenarios, it ...
Suraj Kamal, C. Satheesh Chandran, M.H. Supriya   +2 more
doaj   +1 more source

Acoustic Performance Prediction of Undersea Vehicles

水下无人系统学报, 2023
With the development of deep-sea fishing and marine ranching, the impact of undersea radiation noise of vehicles on marine organisms such as fish cannot be ignored .
Xiaohan FU, Xuezhi FU, Minqing WANG
doaj   +1 more source

Return of Sound Production as a Biomarker of Bottlenose Dolphin Emergence from Anesthesia

Animals, 2023
(1) Background: When a human or animal is recovering from general anesthesia, their medical team uses several behavioral and physiological parameters to assess their emergence from the unconscious state to complete wakefulness.
Brittany L. Jones, Abby M. McClain, Jessica J. Sportelli, Carolina Ruiz Le-Bert   +3 more
doaj   +1 more source

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