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The paper presents the first results of a research aimed at the use of a combined opto-acoustic approach, allowing a large band communication network in a harsh environment like the underwater. The realisation of a special modem, optimised for the highly dense swarm is also presented together with a first realization of an optical transducer suitable for a wireless 3D networking operation.
Oceans environmental monitoring and seafloor exploitation need in situ sensors and optical devices (cameras, lights) in various locations and on various carriers in order to initiate and to calibrate environmental models or to operate underwater industrial process supervision. For more than 10 years Ifremer deploys in situ monitoring systems for various seawater parameters and in situ observation...
In the scope of the development of IFREMERs hybrid underwater vehicle named ‘HROV Ariane’, seafloor mapping with optical imagery sensors is a major function which has motivated the development of a software processing tool for semi-automatic, on-line or off-line, 2D and 3D optical mapping. We present in this paper development results for a complete software framework intending to make state-of-the-art...
In the framework of the ARROWS project (FP7 Environment 308724, September 2012–August 2015), venture funded by the European Commission, modular Autonomous Underwater Vehicles (AUVs) have been developed to the main purposes of mapping, diagnosing, cleaning, and securing of underwater and coastal archaeological sites. These AUVs consist of modular mobile robots, designed and manufactured according to...
Underwater hyperspectral imaging is a novel method for mapping and monitoring the seafloor. It uses the reflected light from objects under water to automatically identify them. This paper explains the basic technology and shows examples of use from two field missions in Norwegian waters. In the two cases, libraries of spectral signatures for the living organisms at the site were established, and subsequently...
This paper describes a virtual environment designed and developed aiming at increasing the fruition of underwater exploration. Such system is under development in the frame of ARROWS project (end August 2015, funded by the European Commission). Main objectives of ARROWS project are the development and integration of advanced technologies and tools for mapping, diagnosing, cleaning, and securing underwater...
This paper reports the results of the sea experiments and the performance verification of the navigation method for wide area survey of seafloor using multiple autonomous underwater vehicles (AUVs). It has been difficult for conventional navigation methods such as dead reckoning or inertial navigation to achieve wide area survey with high positioning accuracy by only AUVs. In the method, as the AUVs...
In this work we tackle the problem of bathymetry estimation using: i) a multispectral optical image of the region of interest, and ii) a set of in situ measurements. The idea is to learn the relation that between the reflectances and the depth using a supervised learning approach. In particular, quadratic Takagi-Sugeno fuzzy rules are used to model this relation. The rule base is optimized by means...
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