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The Three-Transponder Method: A Novel Approach for Traceable (E)RCS Calibration of SAR Transponders

Döring, Björn J. and Reimann, Jens and Raab, Sebastian and Jirousek, Matthias and Rudolf, Daniel and Schwerdt, Marco (2016) The Three-Transponder Method: A Novel Approach for Traceable (E)RCS Calibration of SAR Transponders. In: Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR). European Conference on Synthetic Aperture Radar (EUSAR), 2016-06-06 - 2016-06-09, Hamburg, Germany.

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Abstract

The radiometric calibration of synthetic aperture radar (SAR) systems is typically based on the known backscatter of calibration point targets such as transponders. Before a SAR calibration campaign can begin it is therefore necessary to determine the backscatter (radar cross section or RCS) of the transponder itself. Known methods suffer from unnecessarily high uncertainty contributions and therefore also affect the radiometric uncertainty of the calibrated SAR system. In this paper we present a novel calibration approach which neither requires to disassemble the amplifier path nor necessitates a separate RCS calibration target such as a corner reflector or a circular disk. Significant sources of measurement uncertainties can therefore be outright avoided. The method is not applicable to all transponders though, and a certain type of transponder design is assumed. Nevertheless, direct metrological traceability to a realization of the SI base unit "meter" can be achieved for the first time. The reduced measurement uncertainties of the novel approach will subsequently allow to reduce the radiometric measurement uncertainties of air- and spaceborne SAR sensors in the future.

Item URL in elib:https://elib.dlr.de/99204/
Document Type:Conference or Workshop Item (Speech)
Title:The Three-Transponder Method: A Novel Approach for Traceable (E)RCS Calibration of SAR Transponders
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Döring, Björn J.UNSPECIFIEDUNSPECIFIED
Reimann, JensUNSPECIFIEDUNSPECIFIED
Raab, SebastianUNSPECIFIEDUNSPECIFIED
Jirousek, MatthiasUNSPECIFIEDUNSPECIFIED
Rudolf, DanielUNSPECIFIEDUNSPECIFIED
Schwerdt, MarcoUNSPECIFIEDUNSPECIFIED
Date:June 2016
Journal or Publication Title:Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:calibration, transponder, RCS
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Hamburg, Germany
Event Type:international Conference
Event Dates:2016-06-06 - 2016-06-09
Organizer:VDE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Projekt TanDEM-X
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Döring, Björn
Deposited On:09 Nov 2015 11:30
Last Modified:31 Jul 2019 19:56

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