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Assessment of Tropospheric Effects for Calibrating precisely Space-borne SAR Systems

Danklmayer, Andreas and Döring, Björn and Schwerdt, Marco (2008) Assessment of Tropospheric Effects for Calibrating precisely Space-borne SAR Systems. In: Proceedings of Committee on Earth Observation Satellites (CEOS). Committee on Earth Observation Satellites (CEOS), 2008-11-27 - 2008-11-28, Oberpfaffenhofen, Germany.

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For space-borne SAR systems operating in X-band and beyond, the propagation media along the propagation path may distort SAR measurements. In order to meet the high demand on radiometric accuracy, tropospheric attenuation effects have to be taken into account during the external calibration procedure. Especially in X-band it is well known that the attenuation caused by heavy precipitation events may reach values up to about 30 dB. In this contribution it is shown how the calibration of SAR-systems is influenced by weather (precipitation) and how the radiometric accuracy can be improved by taking the atmospheric conditions into account. A concept is introduced that has been applied during the commissioning phase of the German TerraSAR-X satellite. By acquiring simultaneously ground-based weather radar data and the SAR acquisitions it was possible to flag affected SAR images and to exclude them from the procedure to derive the absolute calibration factor. Thus, the precision of calibrating TerraSAR-X could be improved yielding a high radiometric accuracy of 0.31 dB in strip-map mode acquisition.

Item URL in elib:https://elib.dlr.de/55734/
Document Type:Conference or Workshop Item (Other, Speech)
Title:Assessment of Tropospheric Effects for Calibrating precisely Space-borne SAR Systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:November 2008
Journal or Publication Title:Proceedings of Committee on Earth Observation Satellites (CEOS)
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Calibration, TerraSAR-X, SAR, Microwave imaging, Tropospheric Propagation effects, Signal Attenuation
Event Title:Committee on Earth Observation Satellites (CEOS)
Event Location:Oberpfaffenhofen, Germany
Event Type:international Conference
Event Start Date:27 November 2008
Event End Date:28 November 2008
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 - Vorhaben SAR-Expert-Support-Lab (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Danklmayer, Dr.-Ing. Andreas
Deposited On:15 Dec 2008
Last Modified:24 Apr 2024 19:19

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