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Authors: De Paulis, R.* 
Prati, C.* 
Scirpoli, S.* 
Rocca, F.* 
Tesei, A.* 
Sletner, P. A.* 
Biagini, S.* 
Guerrini, P.* 
Gasparoni, F.* 
Carmisciano, C.* 
Locritani, M.* 
Title: SAS multipass interferometry for monitoring seabed deformation using a high-frequency imaging sonar
Journal: 2011 IEEE - Spain OCEANS - Proceedings of a meeting held 6-9 june 2011, Santander, Spain 
Series/Report no.: /1 (2011)
Publisher: IEEE - Institute of Electrical and Electronics Engineers
Issue Date: Aug-2011
Keywords: SAS multipass interferometry
altimetric variations
seabed deformation
Subject Classification05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous 
05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous 
Abstract: 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.
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