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NURC – La Spezia, Italy
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- PublicationRestrictedSAS multipass interferometry for monitoring seabed deformation using a high-frequency imaging sonar(2011-08)
; ; ; ; ; ; ; ; ; ; ; ;De Paulis, R.; ENI Exploration & Production Division – S. Donato Milanese, Italy ;Prati, C.; DEI – Politecnico di Milano, Italy ;Scirpoli, S.; DEI – Politecnico di Milano, Italy ;Rocca, F.; DEI – Politecnico di Milano, Italy ;Tesei, A.; NURC – La Spezia, Italy ;Sletner, P. A.; NURC – La Spezia, Italy ;Biagini, S.; NURC – La Spezia, Italy ;Guerrini, P.; NURC – La Spezia, Italy ;Gasparoni, F.; Tecnomare S.p.A – Marghera, Italy ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Locritani, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia; ; ; ; ; ; ; ; ; ; Abstract-. This paper presents the results of a two years project led and funded by Eni from 2008 to 2010 with the aim of supporting the development and experimentation of innovative technology for environmental monitoring. The problem addressed is the precise estimate of possible altimetric variations of the seabed through long-term monitoring. The selected methodology consists in the application of repeat-track interferometry to high-resolution, high-frequency sonar data collected from an AUV during repeated surveys of a seafloor area of interest. The paper describes the experimental measurements conducted at sea, the SAS and interferometry methodologies developed, and the results obtained on artificial objects sitting on the seabed. The quality of the achieved focusing is analyzed. The achieved repeat-pass SAS interferograms are shown and analyzed. The coherence along time of the particular kind of seabed (silty sand) characterizing the experimental area is presented and the utility of artificial reflectors for long-term SAS interferometry is discussed.481 32 - PublicationOpen AccessCAIMAN Experiment(2007-06-05)
; ; ; ; ;Gabellone, A.; Italian Navy – Institute of Electronics and Communications “G. Vallauri”, MARITELERADAR - Viale Italia, 71 – 57126 Livorno - Italy ;Faggioni, O.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Soldani, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Guerrini, P.; NATO Undersea Research Centre, Viale San Bartolomeo, 400 – 19138 La Spezia - Italy; ; ; ; Giorgio RittoreNon-acoustic detection systems can be used in combination with Sonar systems to determine the presence of an underwater threat, such as terrorist divers. The goal of the CAIMAN (Coastal Anti Intruders MAgnetometers Network) joint experiment (Italian Navy, NATO Undersea Research Centre and INGV Marine Geophysics) is the application of High Definition Geophysics Magnetic techniques in a port protection scenario, where conventional measurements of very low magnetic sources, like intruder swimmers, are strongly disturbed by ambient, natural and artificial, background noise and other time-variant magnetic anomalies. Two tri-axial fluxgate magnetometers were deployed on the sea bottom and connected to a shore side measurement station. A team of navy divers, wearing both COTS and EOD equipment, performed some coastal approach runs on each magnetometer alternatively. Magnetic signature data were logged and post processed using MATLAB®. Results demonstrated the effectiveness of high definition time reduction techniques using a self-referred integrated array design.232 4921