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Techniques and Examples for the 3D Reconstruction of complex Scattering Situations using TerraSAR-X

Adam, Nico and Zhu, Xiao Xiang and Minet, Christian and Liebhart, Werner and Eineder, Michael and Bamler, Richard (2009) Techniques and Examples for the 3D Reconstruction of complex Scattering Situations using TerraSAR-X. In: Proceedings of IGARSS 2009, pp. 900-903. IGARSS 2009, 13.-17. Jul. 2009, Cape Town, South Africa.

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Abstract

The German radar satellite TerraSAR-X was launched in June 2007. Since then, it is continuously providing high resolution space-borne radar data which are perfectly suit-able for sophisticated interferometric applications. I.e. the mission concept and the SAR sensor support the coherent stacking of radar scenes which is the basis for advanced processing techniques e.g. Persistent Scatterer Interferome-try (PSI) and SAR tomography. In particular, the short re-peat cycle of eleven days and the highly reproducible scene repetition of the spotlight acquisitions support the stacking and consequently the time series analysis of the radar data. Furthermore, the sensor’s orbital tube is precisely controlled to be in the order of 200 m which basically allows to utilize the baseline spread of the stacked acquisitions. However, this small spread is actually limiting the resolution in the SAR tomography. Interferometric applications could be demonstrated al-ready in a very early stage of the TerraSAR-X mission. Be-cause the resolution is 0.6 m in slant range and 1.1 m in azimuth in the high resolution spotlight mode the PSI and the SAR tomography processing results were impressive. Urban areas and single buildings could be mapped from space in three dimensions. Even the structural stress of sin-gle buildings caused by thermal dilation could be demon-strated. However, extended layover areas are caused by typical buildings and as a consequence complicated scatter-ing situations need to be resolved. DLR’s operational In-SAR processing system GENESIS had already been adapted to cope with the new sensor modes of TerraSAR-X and their new specific spectral characteristics. Now, the new image characteristics e.g. the extended layover areas and the long time coherent distributed scatterer need better to be supported. Subject is to optimally exploit the available in-formation e.g. the radar reflectivity. Several algorithms of the processing system can take advantage of this, e.g. the scatterer configuration detection. As a matter of fact, the scatterer configuration has now become a very important characteristic for each resolution cell. It influences e.g. the estimation data extraction, the estimation of the 3D location and basically the estimation precision. A typical resolution cell can be composed of a single dominant point scatterer surrounded by clutter, two or more dominant point scatter-ers in clutter and of distributed scatterers with a specific phase stability over time. The paper provides technical de-tails and a processing example of a newly developed algo-rithm to retrieve the 3D location of point scatterers from the scene’s intensity which finally also provides the information on the scatterer configuration in a resolution cell.

Document Type:Conference or Workshop Item (Speech)
Title:Techniques and Examples for the 3D Reconstruction of complex Scattering Situations using TerraSAR-X
Authors:
AuthorsInstitution or Email of Authors
Adam, Niconico.adam@dlr.de
Zhu, Xiao XiangTUM
Minet, Christianchristian.minet@dlr.de
Liebhart, Wernerwerner.liebhart@dlr.de
Eineder, Michaelmichael.eineder@dlr.de
Bamler, Richardrichard.bamler@dlr.de
Date:July 2009
Journal or Publication Title:Proceedings of IGARSS 2009
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 900-903
Status:Published
Keywords:Persistent Scatterer Interferometry, SAR tomography, SAR radargrammetry, TerraSAR-X
Event Title:IGARSS 2009
Event Location:Cape Town, South Africa
Event Type:international Conference
Event Dates:13.-17. Jul. 2009
Organizer:IEEE Geoscience and Remote Sensing Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Nico Alexander Adam
Deposited On:20 Jan 2010 10:33
Last Modified:05 Apr 2013 14:04

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