Results 21 to 30 of about 5,633 (244)

Unsupervised active sonar contact classification through anomaly detection

EURASIP Journal on Advances in Signal Processing, 2023
Target detection and sonar contact classification with active sonar systems are not trivial especially when operating in coastal and shallow water environments with multipath propagation, high reverberation and clutter. It is even more difficult when the
Pietro Stinco, Alessandra Tesei, Kevin D. LePage   +2 more
doaj   +1 more source

Empowering and conquering infirmity of visually impaired using AI‐technology equipped with object detection and real‐time voice feedback system in healthcare application

CAAI Transactions on Intelligence Technology, EarlyView., 2023
Abstract The Internet of Things is emerging as a crucial technology in aiding humans and making their lives easier. Among the human population, a large percentage of people suffer from disabilities resulting in challenges in everyday life particularly people with visual disabilities.
Hania Tarik, Shahzad Hassan, Rizwan Ali Naqvi, Saddaf Rubab, Usman Tariq, Monia Hamdi, Hela Elmannai, Ye Jin Kim, Jae‐Hyuk Cha   +8 more
wiley   +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

Changes in dive behaviour during naval sonar exposure in killer whales, long-finned pilot whales, and sperm whales. [PDF]

, 2012
Anthropogenic underwater sound in the environment might potentially affect the behavior of marine mammals enough to have an impact on their reproduction and survival.
Tyack, P.L., Fahlman, A., Petter Helgevold Kvadsheim, Miller, P. J. O., Lam, F.P.A., Lam, F. P. A., Andreas eFahlman, F. P. A. Lam, Tyack, Peter L., P. J. O. Miller, Sivle, L.D., Tyack, P. L., Lise Doksæter Sivle, Frans-Peter eLam, Kvadsheim, P.H., Miller, P.J.O., Fahlman, Andreas, Sivle, Lise D, P. H. Kvadsheim, P. L. Tyack, Tyack, Peter Lloyd, Kvadsheim, P. H., Sivle, Lise Doksæter, Patrick eMiller, Miller, Patrick, L. D. Sivle, Miller, Patrick J. O., A. Fahlman, Peter eTyack, Kvadsheim, Petter H, Sivle, L. D., Lam, Frans Peter   +31 more
core   +1 more source

Active ABF for sonar [PDF]

Proceedings of 27th Asilomar Conference on Signals, Systems and Computers, 2002
An adaptive beamforming (ABF) algorithm tailored for active sonar is described. It is especially suited for processing FM waveform received by a fixed or moving sensor array. Adaptation is confined to small windows of time whose duration is closely related to the range resolution of the FM ping.
openaire   +2 more sources

Modelled sonar and target depth distributions for active sonar operations in realistic environments [PDF]

, 2022
Target detection performance of mid-frequency active sonars depends heavily on both sonar and target depth. For a given target depth, a sonar performance model may help predict a sonar depth that maximizes the detection performance in the present ...
Hjelmervik, Karl Thomas, Andreassen, Kristoffer Engedal   +1 more
core   +1 more source

Active sonar reverberation suppression change graph.

, 2023
Active sonar reverberation suppression change graph.
Zhen Wang (72451), Xiao Chen (260187), Yuan An (177578), Hao Zhang (15339)   +3 more
core   +1 more source

Active Control of the Reflection Coefficient of an Underwater Surface

Acoustics, 2023
From a strategic point of view, it is essential to protect underwater vehicles from being detected by opponents. Modern mono- or bistatic sonar systems are capable of precisely determining the position of a watercraft.
Johannes Timmermann, Norbert Hövelmann, Delf Sachau   +2 more
doaj   +1 more source

Study of reverberation pattern and its cancellation method in shallow water [PDF]

Theoretical and Applied Mechanics, 2007
In shallow water, the primary limitation of the performance of active sonar is the reverberation that originates from volume and boundaries scattering as well as multi-path propagation. There­fore, reverberation cancelation is an important research topic
Yang Shiuh-Kuang, Chiu Shih-Ming, Wei Ruey-Chang   +2 more
doaj   +1 more source

Advances In Active Sonar Tracking

, 2006
Publication in the conference proceedings of EUSIPCO, Florence, Italy ...
Stefano Coraluppi, Craig Carthel
openaire   +4 more sources