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Estimating orbital trajectories from fringe gradients in SAR interferograms for measuring crustal strain

Kohlhase, A.O. and Feigl, K.L. and Massonnet, D. and Ferretti, A. (2003) Estimating orbital trajectories from fringe gradients in SAR interferograms for measuring crustal strain. IGARSS 2003, Toulouse, 21. - 25.07.2003.

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Abstract

We develop and assess a new orbital tuning approach by applying differential Synthetic Aperture Radar (SAR) interferometry. We use interferograms of the same site for estimating across-track and radial orbit adjustments from fringe gradients caused by orbit uncertainties. Our approach eliminates these fringes by using the improved short-arc orbit estimates. Taking six estimates from the Delft Institute for Earth-Orientated Space Research (DEOS), the approach yields mean standard deviations of 2.4 cm for the across-track and 4.5 cm for the radial components. The interferograms calculated with our post-fit orbital estimates compare favorably with those corrected with a conventional orbital tuning approach. We can now distinguish between orbital and deformation contributions to interferometric SAR phase gradients and are able to measure surface deformation changes over an interseismic time interval longer than one year. Our new approach is limited, however, to well-correlated interferograms where it is possible to measure the fringe gradient. We have also applied Permanent Scatterers (PS) technique to 42 SAR images acquired by ERS between August 1992 and June 1998. This approach estimates the average range change rate of more than 3 million PS with a formal standard deviation of 0.3 mm/yr along the line of sight. We obtain a phase coherence factor greater than 0.8 and a standard deviation of 3 mm for a single Line Of Sight (LOS) measurement. This velocity field is much easier to interpret than the separate interferometric pairs. Interpreting these interesting features in terms of geophysical models of inter-seismic and post-seismic deformation, however, will require further research effort.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Estimating orbital trajectories from fringe gradients in SAR interferograms for measuring crustal strain
Authors:
AuthorsInstitution or Email of Authors
Kohlhase, A.O.UNSPECIFIED
Feigl, K.L.UNSPECIFIED
Massonnet, D.UNSPECIFIED
Ferretti, A.UNSPECIFIED
Date:2003
Status:Published
Keywords:Differential InSAR - ERS trajectory estimation - Crustal strain - Permanent Scatterers
Event Title:IGARSS 2003, Toulouse, 21. - 25.07.2003
Organizer:IEEE
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):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Deposited By: Dr.-Ing. Andreas Kohlhase
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 19:51

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