Results 91 to 100 of about 346 (129)

Seabed classification using multibeam echosounder

2008 1st International Conference on Information Technology, 2008
The method of seabed identification and classification from multibeam sonar echoes is presented. The proposed approach is based on calculation of a set of parameters of an echo envelope, similarly as in seafloor classification using single beam echosounder.
Zbigniew Lubniewski, Andrzej Chybicki
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Delaunay Triangulation Algorithms Useful for Multibeam Echosounding

Journal of Surveying Engineering, 2003
The Delaunay triangulation is a widely appreciated and investigated mathematical model for topographic surface represen- tation. After a brief theoretical description, six possible basic algorithms to construct a Delaunay triangulation are analyzed and properties that can be exploited for multibeam echosounder data processing are investigated.
Gert Brouns, Alain De Wulf, Denis Constales   +2 more
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Panel-based bathymetric SLAM with a multibeam echosounder

2017 IEEE Underwater Technology (UT), 2017
A bathymetric Simultaneous Localization and Mapping (SLAM) algorithm is presented which is capable of mapping elevation changes in undulating seabed terrain and simultaneously localizing the vehicles position relative to the constructed terrain elevation map. The algorithm enables to marine vehicles navigate and build a map autonomously in a GPS-denied
Taeyun Kim, Jinwhan Kim
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Multibeam Echosounders

2017
Multibeam echosounders have revolutionized our ability to resolve seabed geomorphology and regionally define its substrate. Using a fan of narrow acoustic beams, the slant ranges, angles and returned backscattered intensity can be employed to define the seabed elevation and infer the substrate.
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Postprocessing and signal corrections for multibeam echosounder images

Oceans '97. MTS/IEEE Conference Proceedings, 2002
Multibeam 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
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Statistical characterization of multibeam echosounder data

IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 2002
The 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 ...
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The development of the multibeam echosounder: An historical account

The Journal of the Acoustical Society of America, 1998
The 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
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Multibeam echosounder calibration with split-aperture transmission

2014 Oceans - St. John's, 2014
Results 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, Peter A. Fox, Robert Huxtable, John C. Peterson   +3 more
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Improvement of multibeam echosondeur bottom detection

SPIE Proceedings, 2004
Concerning 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
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Automatic processing of the multibeam echosounding data based on CUBE algorithm

2013 IEEE International Conference on Information and Automation (ICIA), 2013
Based 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
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