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High Bandwidth Spotlight SAR Interferometry withTerraSAR-X

Eineder, Michael and Adam, Nico and Yague-Martinez, Nestor and Fritz, Thomas and Brcic, Ramon (2008) High Bandwidth Spotlight SAR Interferometry withTerraSAR-X. In: IEEE International Geoscience and Remote Sensing Symposium (IGARSS). IGARSS 2008, 2007-07-06 - 2007-07-11, Boston, Massachusetts (USA).

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TerraSAR-X is a new German X band SAR satellite launched in June 2007. DLR is the owner of this satellite and operates the payload data ground segment. DLR is furthermore responsible for scientific exploitation of the data while the rights for commercial exploitation are allowed to EADS Astrium Infoterra. During a 6 month commissioning phase after launch thousands of TerraSAR-X images were acquired and analyzed. A significant task during this phase was to verify the quality of the images with respect to their application for SAR interferometry. In the framework of this task it was also possible to explore the potential of SAR interferometry with much higher resolution than openly available so far. The highest resolution of TerraSAR-X is achieved in high resolution spotlight mode with 300 MHz range bandwidth. This corresponds to a resolution of about 1 meter in azimuth and 0.5 meter in range. Images with this mode offer exciting new potentials, but the interferometric data processing requires some care and algorithmic modifications compared to conventional stripmap mode processing: 1) The dynamic antenna squint angle in azimuth direction requires accurate imaging control at the sensor and the resulting fast Doppler drift rate needs to be taken account for in the InSAR processor. The paper demonstrates that excellent spotlight interferometry results have been achieved in several test sites. 2) The high range bandwidth brings the range resolution rather close to the dimension of the wavelength. In consequence simple approximations for the geometric distortions of the SAR images are no more sufficient. Instead, SAR interferometry and radargrammetry have to be considered jointly in data processing. The paper shows how InSAR processing has to be modified to achieve good results. 3) Furthermore the high resolution can help in interferometric phase unwrapping by exploiting the wavelength dispersion with split bandwidth techniques. The paper shows some first results of this new application. The algorithms and results are illustrated with numerous high resolution images mainly from urban areas.

Item URL in elib:https://elib.dlr.de/54539/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:High Bandwidth Spotlight SAR Interferometry withTerraSAR-X
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Eineder, Michaelmichael.eineder (at) dlr.deUNSPECIFIED
Adam, NicoNico.Adam (at) dlr.deUNSPECIFIED
Yague-Martinez, NestorTechnische Universität MünchenUNSPECIFIED
Fritz, Thomasthomas.fritz (at) dlr.deUNSPECIFIED
Brcic, Ramonramon.brcic (at) dlr.deUNSPECIFIED
Date:7 July 2008
Journal or Publication Title:IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:TerraSAR-X, Interferometry
Event Title:IGARSS 2008
Event Location:Boston, Massachusetts (USA)
Event Type:international Conference
Event Dates:2007-07-06 - 2007-07-11
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 - Projekt TerraSAR-X Nutzlastbodensegment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Eineder, Prof. Dr. Michael
Deposited On:04 Jul 2008
Last Modified:06 May 2013 16:01

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