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Acoustical imaging development

Objective

Development of a new generation of sonar systems for seafloor imaging.
A prototype high resolution sea floor mapping system has been development, making use of sophisticated signal processing, synthetic imaging algorithms and wide band transducer design. Software simulations of the performance of wide band synthetic sonar have been constructed, to assess image processing schemes. Numerical models of sonar echoes backscattered from the sea floor have been completed to determine how to interpret the data. The feasibility of towing a device from a vessel was investigated. Tests were carried out in water tanks, and parameters of experimental prototypes calculated from theory and experiment. Sea trials have been conducted to prove the feasibility of such a prototype (May 1993).
This will have to ensure both a great ease of use and high performances. To reach these aims, these systems will include innovative technology of wide-band signal processing and more particularly of synthetic aperture: while classical imaging systems (sonar) consider the ship movement as an external parameter and provide for each position a "snapshot", the synthetic aperture sonars integrate these movements in the processing. As opposed to classical sonars, for which increasing the resolution proceeds from an increase of the array length (problem of manoeuvrability), a synthetic aperture sonar allows it to reach the same resolution using a small-sized towed array. The complexity of the system is thus no longer the immersed mechanical parts, but the electronic instrumentation, the signal processing and the trajectory systems. All these will be developed in this project to provide an accurate mapping of seafloors and a seabottom classification.

Coordinator

IFREMER - INSTITUT FRANÇAIS DE RECHERCHE POUR L'EXPLOITATION DE LA MER
Address
Rue Jean-jacques Rousseau 155, Technopolis 40
92138 Issy Les Moulineaux
France

Participants (7)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Chemin Joseph Aiguier 31
13402 Marseille
Danish Maritime Institute
Denmark
Address
99,Hjortekærsvej
2800 Lyngby
FOUNDATION OF RESEARCH AND TECHNOLOGY - HELLAS
Greece
Address
Vassilika Vouton
71110 Iraklion
Institut de Chimie et de Physique Industrielles de Lyon
France
Address
31 Place Bellecour
69298 Lyon
RESON A/S
Denmark
Address
13,Fabriksvangen 13
3550 Slangerup
TECHNICAL UNIVERSITY OF DENMARK
Denmark
Address
Anker Engelundsvej 1, Building 101
2800 Lyngby
UNIVERSITY OF NEWCASTLE UPON TYNE
United Kingdom
Address

NE1 7RU Newcastle Upon Tyne