Results 71 to 80 of about 1,151,241 (199)
Reviews of Geophysics, Volume 64, Issue 1, March 2026.Abstract Sea ice is a crucial component of polar climate systems and is undergoing substantial changes in both hemispheres due to evolving climatic conditions. Arctic sea ice is transitioning from perennial to seasonal cover, and the Southern Ocean sea ice is exhibiting recent minima and enhanced seasonality.
Jari Haapala +19 more
wiley +1 more source
, 2007 This report is the fourth in a series of five, designed to investigate the detection oftargets buried in saturated sediment, primarily through acoustical or acoustics-relatedmethods.
Evans, R.C.P.
core +1 more source
Impact of Biomimetic Pinna Shape Variation on Clutter Echoes: A Machine Learning Approach
Advanced Intelligent Systems, Volume 8, Issue 2, February 2026.Bats with dynamic ear structures navigate dense, echo‐rich environments, yet the echoes they receive are highly random. This study shows that machine learning can reliably detect structural signatures in these seemingly chaotic biosonar signals. The results open new directions for biologically inspired sensing, where time‐varying receiver shapes ...
Ibrahim Eshera +2 more
wiley +1 more source
MATHEMATICAL MODEL AND DELAY TIME OF REFLECTED SIGNAL IN SYNTHETIC APERTURE SONAR
Доклады Белорусского государственного университета информатики и радиоэлектроники, 2019 A mathematical model of time structure of the reflected signals in the synthetic aperture sonar is considered. The model provides the algorithm design of direct synthesis of antenna aperture, which allows to obtain high resolution image of seabed surface
S. R. Heister, T. T. Tran
doaj
Limnology and Oceanography: Methods, Volume 24, Issue 2, February 2026.Abstract Marine gas bubble release is a worldwide phenomenon that impacts the local marine ecosystem and contributes to carbon fluxes with respect to global warming. It is still challenging to assess gas flow for large seep areas (tens of km2), but recent advances in calibrating and processing multibeam echosounder (MBES) data make this problem ...
P. Urban +2 more
wiley +1 more source
Self-Training Can Reduce Detection False Alarm Rate of High-Resolution Imaging Sonar
Applied SciencesImaging sonar is a primary means of underwater detection, but it faces challenges of high false alarm rates in sonar image target detection due to factors such as reverberation, noise, and resolution.
Jingqi Han +5 more
doaj +1 more source
Platform motion estimation in multi-band synthetic aperture sonar with coupled variational autoencoders [PDF]
JASA Express LettersCoherent processing in synthetic aperture sonar (SAS) requires platform motion estimation and compensation with sub-wavelength accuracy for high-resolution imaging.
Angeliki Xenaki +2 more
doaj +1 more source
High-Resolution Sonars: What Resolution Do We Need for Target Recognition?
EURASIP Journal on Advances in Signal Processing, 2010 Target recognition in sonar imagery has long been an active research area in the maritime domain, especially in the mine-counter measure context. Recently it has received even more attention as new sensors with increased resolution have been developed ...
Pailhas Yan, Petillot Yvan, Capus Chris
doaj
Fusion of Local Statistical Parameters for Buried Underwater Mine Detection in Sonar Imaging
EURASIP Journal on Advances in Signal Processing, 2008 Detection of buried underwater objects, and especially mines, is a current crucial strategic task. Images provided by sonar systems allowing to penetrate in the sea floor, such as the synthetic aperture sonars (SASs), are of great interest for the ...
M. Amate +4 more
doaj +1 more source
NPS high resolution synthetic aperture sonar [PDF]
, 1995 This thesis investigated the use of synthetic aperture techniques to achieve a long effective aperture, high resolution, imaging sonar. The approach included a full simulation of the system using the MATLAB programming environment that provided a model ...
Welter, Joseph Donald
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