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Radiometric Accuracy and One-Year-Stability of Sentinel-1A Determined using Point Targets

Schmidt, Kersten and Tous Ramon, Núria and Schwerdt, Marco (2017) Radiometric Accuracy and One-Year-Stability of Sentinel-1A Determined using Point Targets. In: 14th European Microwave Conference, EURAD 2017. European Radar Conference (EuRAD), 2017-10-08 - 2017-10-13, Nuremberg, Germany. doi: 10.23919/EURAD.2017.8249213.

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Sentinel-1A is a space-borne SAR system developed in the frame of the Copernicus Program. DLR supported the radiometric and polarimetric calibration of Sentinel-1A by the analysis of point target responses of several acquisitions considering different modes (all except wave mode), beams and polarization channels. An elevation dependent bias, which had not been properly predicted by the used antenna model, was found for all investigated modes. Offsets up to 2 dB were determined during the SAR instrument calibration phase, in particular for low and high elevation angles. Therefore, in order to correct these elevation biases, a radiometric refinement campaign was carried out by ESA in November 2015. After that, Sentinel-1A radiometric accuracy and radiometric long-term stability (over a period of one year) were analyzed. For this period, the radiometric accuracy and the channel imbalance in amplitude were determined for the main mode IW and V-polarization. Moreover, a slight drift of the derived calibration factor has been observed since July 2016, at the same time as an anomaly affecting several transmit and receive modules in one tile was detected. The radiometric behavior of Sentinel-1A should therefore be monitored for a longer period of time, especially to detect potential aging effects of the SAR instrument.

Item URL in elib:https://elib.dlr.de/113870/
Document Type:Conference or Workshop Item (Speech)
Title:Radiometric Accuracy and One-Year-Stability of Sentinel-1A Determined using Point Targets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schmidt, KerstenUNSPECIFIEDhttps://orcid.org/0000-0001-7896-908XUNSPECIFIED
Tous Ramon, NúriaUNSPECIFIEDhttps://orcid.org/0000-0002-0450-0438UNSPECIFIED
Schwerdt, MarcoUNSPECIFIEDhttps://orcid.org/0000-0002-0045-3726UNSPECIFIED
Journal or Publication Title:14th European Microwave Conference, EURAD 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:SAR calibration, Sentinel-1, radiometric accuracy
Event Title:European Radar Conference (EuRAD)
Event Location:Nuremberg, Germany
Event Type:international Conference
Event Dates:2017-10-08 - 2017-10-13
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - SAR methods
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Schmidt, Dr. Kersten
Deposited On:01 Sep 2017 10:57
Last Modified:19 Jul 2023 13:22

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