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Absolute Phase Offset in SAR Interferometry: Estimation by Spectral Diversity and Integration into Processing

Scheiber, Rolf and Fischer, Jens (2004) Absolute Phase Offset in SAR Interferometry: Estimation by Spectral Diversity and Integration into Processing. EUSAR, 2004-05-25 - 2004-05-27, Ulm, Germany.

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Abstract

In SAR interferonmetry, prior to DEM generation or any other evaluation (differential interferometric processing, velocity computation in case of along track interferometry), an unknown phase offset has to be estimated and subtracted from the unwrapped phase. This usually is referred to as absolute phase estimation. In most cases tiepoints (e.g. corner reflectors) are used to estimate this offset, or it is computed from the overlap region of adjacent or crossing swaths (e.g. in case of SRTM). It is shown that the absolute phase offset can be related to range co-registration parameters. After a review of the co-registration method based on spectral diversity, its benefits for the measurement of the absolute phase offset are discussed. It is essential to note that the applied coregistration function must be taken into account to allow correct computation of the absolute phase offset. Finally, the most suited integration into a SAR processing chain, which is based on efficient high precision algorithms (e.g. Extended Chirp Scaling) is proposed. The performance of the adopted approach is demonstrated using single-pass interferometric data acquired by the E-SAR sensor in X-Band.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Absolute Phase Offset in SAR Interferometry: Estimation by Spectral Diversity and Integration into Processing
Authors:
AuthorsInstitution or Email of Authors
Scheiber, RolfUNSPECIFIED
Fischer, JensUNSPECIFIED
Date:2004
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:p. 97
Status:Published
Keywords:SAR-interferometry, Co-registration, absolute phase
Event Title:EUSAR
Event Location:Ulm, Germany
Event Type:international Conference
Event Dates:2004-05-25 - 2004-05-27
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 -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Deposited By: elib DLR-Beauftragter
Deposited On:06 Feb 2006
Last Modified:06 Jan 2010 19:56

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