Results 21 to 30 of about 336,461 (224)

A risk function for behavioral disruption of Blainville’s beaked whales (Mesoplodon densirostris) from mid-frequency active sonar [PDF]

, 2014
There is increasing concern about the potential effects of noise pollution on marine life in the world’s oceans. For marine mammals, anthropogenic sounds may cause behavioral disruption, and this can be quantified using a risk function that relates sound
Ashley Dilley, Neales, Bert, Jarvis, S, Thomas Len, Bert Neales, Dilley, Ashley, Harwood John, McCarthy, Elena, Jessica Shaffer, New, Leslie, Morrissey, Ronald, Moretti David, Leslie New, Marques, Tiago A., Moretti, David, Shaffer Jessica, Harwood, John, John Harwood, Marques, Tiago, Neales Bert, David Moretti, Susan Jarvis, Shaffer, Jessica, Morrissey Ronald, Tiago Marques, New Leslie, Mccarthy, E, Morrissey, Ron, Ronald Morrissey, Jarvis Susan, New, Leslie Frances, Len Thomas, Marques Tiago, Dilley Ashley, Elena McCarthy, Jarvis, Susan, McCarthy Elena, Thomas, Len, Thomas, Len; id_orcid, Marques, Tiago A.; id_orcid   +39 more
core   +2 more sources

Radial Velocity Estimation for Multiple Objects Using In-Air Sonar With MIMO Virtual Arrays

IEEE Access, 2023
As autonomous platforms become more advanced, it is useful to obtain more information about the environment. Classic vision sensors such as RGB-D cameras, LiDAR, or acoustical imaging cameras are capable of accurately displaying the location of an object
Robin Kerstens, Wouter Jansen, Jan Steckel   +2 more
doaj   +1 more source

A novel deconvolution beamforming algorithm for virtual phased arrays [PDF]

, 2013
Beamforming techniques using phased microphone arrays are one of the most common tools for localizing and quantifying noise sources. However, the use of such devices can result in a series of well-known disadvantages regarding, for instance, their very ...
Fernandez Comesana, Daniel, Fernandez Grande, Efren, Holland, Keith R., Tiana Roig, Elisabet   +3 more
core   +1 more source

Research on the Ambiguity Function Characteristics of Uniform Circular Frequency Diverse Array Sonar

Journal of Marine Science and Engineering
The existing research on frequency diverse arrays (FDAs) predominantly concentrates on narrowband uniform linear frequency diverse arrays (ULFDAs). The uniform circular array presents advantages, such as a small aperture and omnidirectional scanning.
Weiye Liu, Yixin Yang
doaj   +1 more source

Cognitive adaptation of sonar gain control in the bottlenose dolphin. [PDF]

PLoS ONE, 2014
Echolocating animals adjust the transmit intensity and receive sensitivity of their sonar in order to regulate the sensation level of their echoes; this process is often termed automatic gain control. Gain control is considered not to be under the animal'
Laura N Kloepper, Adam B Smith, Paul E Nachtigall, John R Buck, James A Simmons, Aude F Pacini   +5 more
doaj   +1 more source

Comparative Analysis of SVM and CNN for Sonar Signal Classification Using Sparse Arrays

IEEE Access
Coprime and nested sparse arrays are two widely researched sparse arrays. These arrays, requiring fewer sensors compared to full uniform linear arrays (ULAs), still have a high number of degrees of freedom.
Showrov Rahman, Kaushallya Adhikari
doaj   +1 more source

Direction of Arrival Estimation of Acoustic Sources with Unmanned Underwater Vehicle Swarm via Matrix Completion

Remote Sensing, 2022
With the rapid development of vibration and noise reduction technologies, underwater target detection is facing great challenges. Particularly, the task of high-resolution direction of arrival (DOA) estimation with sonar array is becoming more and more ...
Liya Xu, Jianjun Huang, Hao Zhang, Bin Liao   +3 more
doaj   +1 more source

Dolphin-inspired target detection for sonar and radar [PDF]

, 2014
Gas bubbles in the ocean are produced by breaking waves, rainfall, methane seeps, exsolution, and a range of biological processes including decomposition, photosynthesis, respiration and digestion.
Leighton, T.G., Leighton, T., White, P., White, P.R.   +3 more
core   +1 more source

A Comparison of Faulty Antenna Detection Methodologies in Planar Array

Applied Sciences, 2023
Broadcasting, radar, sonar and space telecommunication systems use phased arrays to produce directed signals to be transmitted at the desired angle. This system requires a large number of antenna elements.
Navaamsini Boopalan, Agileswari K. Ramasamy, Farrukh Nagi   +2 more
doaj   +1 more source

Optimizing Strategies for Non‐Invasive Prospection of Settlements in the Intertidal Zone: A Case Study From the Centre of the Drowned Medieval Village of Tolsende (Scheldt Estuary, the Netherlands)

Archaeological Prospection, EarlyView.
ABSTRACT Medieval and early modern drowned villages in the intertidal zone of the Scheldt estuary (the Netherlands) constitute intriguing yet largely understudied components of north‐western Europe's underwater cultural heritage. Despite their high archaeological potential as time capsules of past settlement landscapes, research has remained limited ...
Jan Trachet, Sarah Bäumler, Stefan Krojer, Jeroen Verhegge, Wim De Clercq, Philippe De Smedt, Wouter H. Maes, Bente S. Majchczack, Immo Trinks, Dennis Wilken   +9 more
wiley   +1 more source