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Moving from PS to Slowly Decorrelating Targets: A Prospective View

Ferretti, Alessandro and Novali, Fabrizio and De Zan, Francesco and Prati, Claudio and Rocca, Fabio (2008) Moving from PS to Slowly Decorrelating Targets: A Prospective View. In: Proceeding of the European Conference on Synthetic Aperture Radar (EUSAR), p. 4. European Conference on Synthetic Aperture Radar (EUSAR), 2008-06-03 - 2008-06-05, Friedrichshafen, Germany.

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Abstract

During the last 8 years Permanent Scatterer interferometry (PSInSAR) has been widely used as a powerful tool for surface deformation monitoring both for scientific and commercial projects. A few years after the introduction of this technology, it was highlighted how the constraints on the stability of the radar signature of the targets used as opportunistic measurement points could be too tight. Forcing the PS to be coherent in all interferometric pairs used in the analysis could cause the loss of information coming from scatterers exhibiting PS behavior only in a subset of SAR images. Another concern was related to the estimation of the DEM reconstruction: the problem here is to take advantage of the PS framework trying to extend the set of image pixels where an estimation of the elevation is possible. Apart from geometrical decorrelation and variations of the Doppler centroid values of the acquisitions, temporal decorrelation phenomena strongly limit the coherence values of many scatterers within the area of interest. The question arising is whether the presence of radar scatterers exhibiting high or moderate coherence levels at low temporal baselines (typically one month) can be useful for real life applications and, in case of positive answer, which algorithms are most suited to extract useful information from slowly decorrelating scatterers. Although this topic is still the subject of extensive research activities, this paper summarizes some facts that, in the authors’ opinion, will be the base of any future algorithm. In particular, the analysis of the coherence matrix computed on a pixel-by-pixel basis is shown to be a key-element of any study of decorrelating targets. Its modeling can be extremely useful to extract feature parameters for image segmentation

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Moving from PS to Slowly Decorrelating Targets: A Prospective View
Authors:
AuthorsInstitution or Email of Authors
Ferretti, AlessandroT.R.E.
Novali, FabrizioT.R.E.
De Zan, FrancescoUNSPECIFIED
Prati, ClaudioPOLIMI
Rocca, FabioPOLIMI
Date:June 2008
Journal or Publication Title:Proceeding of the European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:No
In ISI Web of Science:No
Page Range:p. 4
Status:Published
Keywords:SAR Interferometry, temporal decorrelation, covariance matrix, maximum-likelihood estimates, decorrelating targets
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Friedrichshafen, Germany
Event Type:international Conference
Event Dates:2008-06-03 - 2008-06-05
Organizer:VDE
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Prosmart, Smart-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Deposited By: Francesco De Zan
Deposited On:28 Jul 2008
Last Modified:12 Dec 2013 20:32

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