Results 181 to 190 of about 2,586 (213)
Some of the next articles are maybe not open access.
Postprocessing and signal corrections for multibeam echosounder images
Oceans '97. MTS/IEEE Conference Proceedings, 2002Multibeam echosounders own the attractive ability to simultaneously provide a bathymetric map and a sonar image of an insonified area. Nevertheless, their increasing resolution and data rate underline classical approximations used by the manufacturers in the real time algorithms. This leads to artefacts in sonar images and to difficulties in geological
L. Hellequin, X. Lunton, J.M. Augustin
openaire +1 more source
Qualitative and Quantitative Description of Multibeam Echosounder Systematic Errors on Rocky Areas [PDF]
Marine Geodesy, 2012 WOSInternational audienceThis paper deals with the problem of systematic depth errors made in surveying dumped rocks with multibeam echosounder. These errors may induce dangers for navigation in very shallow water areas, or huge costs for coastal ...
Debese, Nathalie +2 more
exaly +1 more source
Statistical characterization of multibeam echosounder data
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 2002The statistical studies of high resolution sonar images recorded by a 95 kHz multibeam echosounder prove that the Rayleigh law is no more adapted to the description of the textured sonar images. Seafloor reverberation statistical models have been put forward to interpret those high resolution particularities and to propose the correlated K-law ...
openaire +1 more source
Multibeam echosounder calibration with split-aperture transmission
2014 Oceans - St. John's, 2014Results are described for a multibeam echosounder calibration experiment in which the elevation angle of a standard spherical target was estimated using a split aperture geometry on the transmit array. This is an extension of the two transmitters — one receiver concept described by Messer et al. (IEEE TAES 32–3, 1158–1164, 1996).
Christian de Moustier +3 more
openaire +1 more source
The development of the multibeam echosounder: An historical account
The Journal of the Acoustical Society of America, 1998The first paper on narrow-beam echosounding was published in 1960. Since then, the advantages of the principle of multibeam swath bathymetry for seabed mapping has been recognized by many institutions working in the field of area mapping underwater. We intend to review the development the multibeam echosounder has undergone from the ‘‘beginning’’ until
openaire +1 more source
Improvement of multibeam echosondeur bottom detection
SPIE Proceedings, 2004Concerning bathymetric multibeam echosondeur systems, the interferometric technique is widely used to get the altitude of an illuminated seafloor section beam. Classical methods only use the zero crossing instant of phase difference to obtain the sea depth. Nevertheless, the phase difference gives more information near the zero crossing.
Llort Pujol, Gerard, Sintes, Christophe
openaire +2 more sources
Experience of working out and modernization of multibeam echosounders
Oceans '99. MTS/IEEE. Riding the Crest into the 21st Century. Conference and Exhibition. Conference Proceedings (IEEE Cat. No.99CH37008), 2003Summary form only given, substantially as follows:- The primary aim of multibeam sonar is to develop the device for direct measurement of bottom reverberation to study regions with different seafloor morphology. This task determines the configuration and processing method of the device installation on towed body for measuring near the bottom, using of ...
S. Dremoutchev +4 more
openaire +1 more source
Automatic processing of the multibeam echosounding data based on CUBE algorithm
2013 IEEE International Conference on Information and Automation (ICIA), 2013Based on combined uncertainty and bathymetry estimator (CUBE) algorithm, a dynamic linear model (DLM) including horizontal and vertical soundings data uncertainties is discussed. Kalman filtering and multiple estimations are utilized to calculate the grid nodes.
Xiaodi Qi, Xinghua Zhou
openaire +1 more source
Quantifying acoustic backscatter of seafloor using multibeam echosounder
The Journal of the Acoustical Society of America, 2021Multibeam echosounder is one of the most important technology for carrying out hydrographic surveys, benthic habitat mapping, marine fisheries, and seafloor surveys. The advantage of multibeam echosounder were produced simultaneously bathymetric and acoustic backscatter.
openaire +1 more source
Robust Subsea Pipeline Tracking with Noisy Multibeam Echosounder
2018 IEEE/OES Autonomous Underwater Vehicle Workshop (AUV), 2018Subsea pipelines are crucial offshore assets aiding transportation of oil and gas. Regular inspections are required for assessing their integrity to ensure continual use and avoid possible marine ecosystem damage. This paper proposes a novel real-time algorithm for pipeline detection and tracking at close proximity using only a multibeam echosounder ...
Vibhav Bharti, David Lane, Sen Wang
openaire +1 more source