Results 131 to 140 of about 3,475,694 (250)

Low frequency synthetic aperture sonar for detecting and classifying buried objects

, 2012
Sidescan high-frequency (HF) sonar (i.e., with frequencies higher than 100 kHz) is ideally suited forproviding high-resolution images of the seafloor. However, since sound does not penetrate into thesediment at these frequencies, such systems cannot be ...
Beckers, A.L.D., Hunter, A.J., Zampolli, M., Quesson, B.A.J., Vossen, R. van, Colin, M.E.G.D.   +5 more
core  

Calibration and mosaicing of forward-scan sonar DIDSON images

, 2012
DIDSON(Dual-frequency identification sonar),a new generation of acoustic video cameras, is applied to research and detect the underwater environment in this paper.
Xu YY(徐元玉), Jin, Wenjun, Chen JB(陈金波), Xie SR(谢少荣), Luo J(罗均)   +4 more
core  

Research on the Distance of the Active Sonar under the Effects of the Thermocline

Journal of Measurement Science and Instrumentation, 2010
The existence of thermocline changes the acoustic structure and effects the direction of the sound rays.This paper analyzes the working process of the active sonar,and the mathematical models.The detection probability of the active sonar under ...
Xian-ku ZHANG, Ji-duan LI
doaj  

Detection parameters design for compound survey seafloor targets by multibeam sonar

, 2013
Swath bathymetry system surveys with wide swath, high location resolution, and is used to detect sea bottom terrain. But the object resolution detected decreases as the depth increasing, its data processing with high mistake, used rarely in sea floor ...
Wu LH(吴利红), Xu WH(许文海), Li YP(李一平)   +2 more
core  

The effects of sound propagation and avoidance behaviour on naval sonar levels received by cetaceans [PDF]

, 2012
The use of active sonar is deemed to be essential for naval operations, but its potential impact on marine life has raised concerns worldwide. In a risk-assessment framework, characterisation of risk of harm is accomplished by combining exposure ...
Wensveen, Paul J.
core  

Improved Active Sonar Tactical Support by Through-the-Sensor REA

, 2011
Reverberation is a problem for active sonar operating in shallow waters, reducing detection probabilities and introducing false alarms. Within the European Defence Agency project Rumble-2, a demonstrator system has been developed for ”through the sensor”
Andersson, B.L., Ivansson, S., Vossen, R. van, Cristol, X., Ainslie, M.A., Dybedal, J., Olsen, G.K., Colin, M.E.G.D., Abrahamsson, L., Chalindar, B., Eidem, E.J., Juhel, B., Pihl, J., Benders, F.P.A.   +13 more
core  

A Frequency-Domain Adaptive Matched Filter for Active Sonar Detection. [PDF]

Sensors (Basel), 2017
Zhao Z, Zhao A, Hui J, Hou B, Sotudeh R, Niu F.   +5 more
europepmc   +1 more source

The Pieter Schippers story : Almost 40 years of developments in sonar performance modelling in the Netherlands

, 2014
This paper is dedicated to the work of Pieter Schippers and gives an overview of his achievement in sonar performance modelling over his career. This publication is the last of a long list, many of which published at UDT [1-5].
Schippers, P., Colin, M.E.G.D., Beerens, S.P.   +2 more
core  

Imaging Sonar Detection and Occlusion-Corrected Abundance Estimation in High-Density Aquaculture. [PDF]

Sensors (Basel)
Zhao T, Zhang X, He Y, Ma H, Liu Y, Ma Z.   +5 more
europepmc   +1 more source

Matched Stochastic Resonance Enhanced Underwater Passive Sonar Detection under Non-Gaussian Impulsive Background Noise. [PDF]

Sensors (Basel)
Dong H, Ma S, Suo J, Zhu Z.
europepmc   +1 more source