Letteratura scientifica selezionata sul tema "Télémétrie acoustique sous-marine"
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Tesi sul tema "Télémétrie acoustique sous-marine"
Pennec, Sébastien. "Amélioration de la précision des systèmes de positionnement à base ultra-courte en acoustique sous-marine". Brest, 2010. http://www.theses.fr/2010BRES2051.
Testo completoThis thesis focuses on positioning systems based on ultra short (USBL) used in underwater acoustics. Positioning systems are subject to many constraints environmental, structural or functional that limits their performance. The studies are conducted on three main sources that limit positioning accuracies. The first source of improvement is related to threshold estimation which conducts to the detection of the signal in the observation. Benchmarking conducted with the processing CFAR (Constant False Alarm Rate) commonly used in SONAR have identified the benefit of proposed approach. The second area of improvement is the reduction of limitation’ associated with the structure and sue of the hydrophones array. A global procedure is proposed to estimate the distance between the acoustic sensors and the misalignment between the acoustic structure and the gyrocompass. Then, coupling between the USEL an INS (INS - Inertial Navigation System) is used to reduce limitation related to the dimension of sensors array. Displacements of the sensor array between each acoustic recurrency are combined to estimate a virtual antenna, these processing permits to obtain a better accuracy than that obtained with real USBL antenna. The third proposal focuses on improving accuracy by using low speed data transmission to help the positioning system. In this context, a processing is proposed to retrieve telemetry informations while maintaining characteristics of the positioning waveforms and application
Sakic-Kieffer, Pierre. "Apport de la géodésie fond de mer à l’évaluation de l’aléa sismique côtier : distancemétrie en mer de Marmara et simulation de GNSS/A aux Antilles". Thesis, La Rochelle, 2016. http://www.theses.fr/2016LAROS018/document.
Testo completoMore than 70 % of the Earth surface is covered by seas and oceans. Several tectonic phenomena, among the most devastating, take place in ocean environment. For example, the subduction zones, which can generate mega-earthquakes associated with devastating tsunamis (Sumatra in 2004, Tōhoku in 2011), but also the underwater strike-slip faults. In many cases, methods of space geodesy cannot discriminate between a blocked or aseismic behavior, because the instruments are located too far from the area potentially deformed by the tectonic process. Thus, it is necessary to develop new techniques to extend conventional observation networks off-shore to map the deformation in the entire area. This thesis focuses on two seafloor geodesy methods, in order to assess the seismic risk evaluation. The first is the relative acoustic ranging, with an efective deployment of the Marmara Sea area. Our early results suggest a locked state at the segment of the North Anatolian fault of İstanbul. The second area considered is the Caribbean subduction. The working scale requires localization of the observed points in a global reference frame. We study ocean processes to consider, and detail a GNSS/A (Acoustic) methodology, consisting of acoustic interrogations from a precisely GNSS positioned surface platform, for a future absolute positioning experience of Guadeloupe
Libri sul tema "Télémétrie acoustique sous-marine"
Hassab, Joseph C. Underwater Signal and Data Processing. Taylor & Francis Group, 2018.
Cerca il testo completoHassab, Joseph C. Underwater Signal and Data Processing. Taylor & Francis Group, 2017.
Cerca il testo completoHassab, Joseph C. Underwater Signal and Data Processing. Taylor & Francis Group, 2018.
Cerca il testo completoHu, Fei. Magnetic Communications: From Theory to Practice. Taylor & Francis Group, 2018.
Cerca il testo completoHu, Fei. Magnetic Communications: From Theory to Practice. Taylor & Francis Group, 2018.
Cerca il testo completoHu, Fei. Magnetic Communications: From Theory to Practice. Taylor & Francis Group, 2018.
Cerca il testo completoHu, Fei. Magnetic Communications: From Theory to Practice. Taylor & Francis Group, 2018.
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