Results 31 to 40 of about 594,002 (213)

Target Tracking from Weak Acoustic Signals in an Underwater Environment Using a Deep Segmentation Network

Journal of Marine Science and Engineering, 2023
In submarine warfare systems, passive SONAR is commonly used to detect enemy targets while concealing one’s own submarine. The bearing information of a target obtained from passive SONAR can be accumulated over time and visually represented as a two ...
Won Shin, Da-Sol Kim, Hyunsuk Ko
doaj   +1 more source

Wake-Responsive AUV Guidance Assisted by Passive Sonar Measurements

Journal of Marine Science and Engineering
To make an Autonomous Underwater Vehicle (AUV) chase a moving target ship that generates wake, wake-responsive guidance can be used. This scenario is applicable to making an underwater torpedo pursue a moving target ship until hitting the target.
Jonghoek Kim
doaj   +1 more source

Acoustic and foraging behavior of a Baird’s beaked whale, Berardius bairdii, exposed to simulated sonar [PDF]

, 2014
Research was supported by the US Navy Chief of Naval Operations, Environmental Readiness Program, the Office of Naval Research, the Naval Postgraduate School, and the National Research Council.Beaked whales are hypothesized to be particularly sensitive ...
A. K. Stimpert, Friedlaender, A., Calambokidis, John, Calambokidis, J., J. A. Goldbogen, Schorr, Greg, Stimpert, Alison, De Ruiter, Stacy Lynn, Southall, Brandon, A. Friedlaender, Friedlaender, Ari, Stimpert, A.K., Goldbogen, J.A., Moretti, David, D. J. Moretti, J. Calambokidis, G. S. Schorr, Falcone, E.A., Moretti, D.J., DeRuiter, S.L., Southall, B.L., S. L. DeRuiter, Falcone, Erin, Goldbogen, Jeremy, Schorr, G.S., B. L. Southall, E. A. Falcone   +26 more
core   +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

Underwater Tone Detection with Robust Coherently-Averaged Power Processor

Journal of Marine Science and Engineering, 2022
The detection of tonal signals with unknown frequencies is an important area of study in underwater signal processing. A common approach to address this issue is to use the Discrete Fourier Transform (DFT) for observations.
Qichen Xie, Cheng Chi, Shenglong Jin, Guanqun Wang, Yu Li, Haining Huang   +5 more
doaj   +1 more source

Orchestrating Circularity in UK Accident Repair: An Intermediary Perspective on Green Parts and Reverse Logistics

Business Strategy and the Environment, EarlyView.
ABSTRACT This study examines the drivers and barriers shaping the adoption of salvaged automotive components (‘green parts’) in the UK accident repair sector and evaluates the strategic implications for intermediary firms in fragmented service ecosystems.
Gu Pang, Hui Sun, Sean Geens, Yeunsoo Park   +3 more
wiley   +1 more source

Null Broadening Beamforming for Passive Sonar Based on Weighted Similarity Vector

Journal of Marine Science and Engineering, 2023
Beamforming technology is very important for passive sonar to detect targets. However, the performance of a beamformer is seriously degraded in practical applications due to the complex and changeable underwater environment.
Yuhao Wang, Zhenkai Zhang
doaj   +1 more source

Recent advances in multifunctional soft robots: A materials–structures–systems co‐design perspective for synergistic integration

FlexMat, EarlyView.
Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu, Zicao Peng, Chong Sun, Haitao Yang   +3 more
wiley   +1 more source

FLSea: Underwater Visual–Inertial and Stereovision Forward‐Looking Data Sets

Journal of Field Robotics, EarlyView.
ABSTRACT Visibility underwater is challenging and degrades as the distance between the subject and the camera increases. That is why forward‐looking underwater computer vision tasks are difficult. We have collected underwater forward‐looking stereovision and visual–inertial image sets using two underwater imaging platforms, a stereo camera rig, and an ...
Yelena Randall, Ori Lifschitz, Tali Treibitz   +2 more
wiley   +1 more source

Narrowband passive sonar tracking [PDF]

, 2010
Passive sonar sensors are the main source of information for a submerged submarine. Modern sonar systems like ISUS 90 offer a number of acoustic antennas and combined signal processing for broadband and narrowband detection and analysis of target noise ...
Hurka, Jörg, Brinkmann, Kevin
core   +1 more source