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Coregistration of Interferometric Stacks of Sentinel-1 TOPS Data

Yague-Martinez, Nestor and Prats, Pau and De Zan, Francesco (2017) Coregistration of Interferometric Stacks of Sentinel-1 TOPS Data. In: Fringe 2005. ESA FRINGE Workshop, 2017-06-05 - 2017-06-09, Helsinki, Finland.

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SAR images coregistration is of fundamental importance for the generation of SAR interferograms. The high azimuth coregistration requirements imposed by the TOPS acquisition mode converts the coregistration of stacked time series images in a demanding task due to temporal decorrelation effects. A joint coregistration approach appears to be the optimal solution for coregistering long stacks. The problem of a joint coregistration has been already addressed in the literature for the case of coherently correlating speckle signals. A similar procedure can be applied when employing the established Enhanced Spectral Diversity (ESD) technique for azimuth coregistration of TOPS images. The methodology for the retrieval of the (rigid) azimuth shift of a slave image with respect to a master image, due to orbital or timing error, will be in first place introduced. A Joint-coregistration approach employing the retrieved shifts of all possible pair combinations will be detailed. A Weighted Least Squares (WLS) estimation is applied to retrieve the azimuth shifts of each image with respect to a selected master image. A stack of Sentinel-1 images acquired in IW mode over Mexico City covering approximately 2 years of acquisitions and eventually other sites is used to evaluate this procedure, comparing its performance to the standard single-master approach. Moreover a validation of the method will be provided highlighting the phase biases that might appear when only a geometric approach or single-master approach are used.

Item URL in elib:https://elib.dlr.de/112053/
Document Type:Conference or Workshop Item (Speech)
Title:Coregistration of Interferometric Stacks of Sentinel-1 TOPS Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Yague-Martinez, NestorUNSPECIFIEDhttps://orcid.org/0000-0002-4923-8525UNSPECIFIED
Prats, PauUNSPECIFIEDhttps://orcid.org/0000-0002-7583-2309UNSPECIFIED
Journal or Publication Title:Fringe 2005
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Sentinel-1, coregistration, TOPS, InSAR
Event Title:ESA FRINGE Workshop
Event Location:Helsinki, Finland
Event Type:international Conference
Event Dates:2017-06-05 - 2017-06-09
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Deposited By: Yague-Martinez, Nestor
Deposited On:02 May 2017 07:24
Last Modified:06 Feb 2018 10:11

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