Results 21 to 30 of about 48,682 (230)
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 +2 more
doaj +1 more source
Transparent and scalable client-side server selection using netlets [PDF]
, 2003 Replication of web content in the Internet has been found to improve service response time, performance and reliability offered by web services. When working with such distributed server systems, the location of servers with respect to client nodes is ...
Collier, Martin, Dharmalingam, Kalaiarul
core +2 more sources
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 +1 more source
Sperm whales reduce foraging effort during exposure to 1-2 kH z sonar and killer whale sounds [PDF]
, 2015 We would like to thank 3S partners and funders especially for enabling this research (NL Ministry of Defence, NOR Ministry of Defence, US Office of Naval Research, and World Wildlife Fund, Norway). PLT was supported by the Scottish Funding Council (grant
Alexander Lam, Frans-Peter +8 more
core +3 more sources
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 +2 more
doaj +1 more source
High-Frequency Volume and Boundary Acoustic Backscatter Fluctuations in Shallow Water [PDF]
, 2003 Volume and boundary acoustic backscatter envelope fluctuations are characterized from data collected by the Toroidal Volume Search Sonar (TVSS), a 68 kHz cylindrical array capable of 360° multibeam imaging in the vertical plane perpendicular to its axis.
de Moustier, Christian +1 more
core +2 more sources
AUV SLAM and experiments using a mechanical scanning forward-looking sonar [PDF]
, 2012 Navigation technology is one of the most important challenges in the applications of autonomous underwater vehicles (AUVs) which navigate in the complex undersea environment.
ArulamPalam +29 more
core +4 more sources
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 +2 more
doaj +1 more source
Inventions, 2022 Modern weapon systems’ survival hinges on their detection capabilities more than anything else. In the active sonar equation, the acoustic target strength is crucial.
Kaveripakam Sathish +4 more
doaj +1 more source
Acoustics in water: synergies with marine biology [PDF]
, 2016 This paper presents some of the bioacoustics related analysis that was performed on the ANTARES data, focussing on the year 2014. The data was processed for sperm whale, dolphin and shipping presence and grouped by hour of the day.
André, Michel +7 more
core +1 more source