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The Three-Transponder Method: A Novel Method for Accurate Transponder RCS Calibration

Döring, Björn J. and Reimann, Jens and Raab, Sebastian and Jirousek, Matthias and Rudolf, Daniel and Schwerdt, Marco (2015) The Three-Transponder Method: A Novel Method for Accurate Transponder RCS Calibration. Progress In Electromagnetics Research B, 61, pp. 297-315. EMW Publishing. ISSN 1937-6472.

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Official URL: http://www.jpier.org/PIERB/pier.php?paper=14110406

Abstract

Transponders (also known as polarimetric active radar calibrators or PARCs) are commonly used for radiometric calibration of synthetic aperture radars (SARs). Currently three methods for the determination of a transponder's frequency-dependent radar cross section (RCS) are used in practice. These require either to measure disassembled transponder components, or a separate radiometric measurement standard (like a flat, metallic plate or a corner reflector), leading to additional uncertainty contributions for the calibration result. In this paper, a novel method is introduced which neither requires disassembly nor an additional radiometric reference. Instead, the measurement results can be directly traced back to a realization of the meter, lowering total measurement uncertainties. The method is similar in approach to the well known three-antenna method, but is based on the radar equation instead of Friis transmission formula. The suitability of the method is demonstrated by a measurement campaign for DLR's three new Kalibri C-band transponders, completed by an uncertainty analysis. The method is not universally applicable for all transponder calibrations because (a) three devices are necessary (instead of only one for the known methods), and (b) the transponders must provide certain additional features. Nevertheless, these features have become standard in modern SAR calibration transponder designs. The novel, potentially more accurate three-transponder method is thus a viable alternative for transponder RCS calibration, ultimately contributing to synthetic aperture radars with a reduced radiometric measurement uncertainty.

Item URL in elib:https://elib.dlr.de/91626/
Document Type:Article
Title:The Three-Transponder Method: A Novel Method for Accurate Transponder RCS Calibration
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Döring, Björn J.UNSPECIFIEDUNSPECIFIED
Reimann, JensUNSPECIFIEDUNSPECIFIED
Raab, SebastianUNSPECIFIEDUNSPECIFIED
Jirousek, MatthiasUNSPECIFIEDUNSPECIFIED
Rudolf, DanielUNSPECIFIEDUNSPECIFIED
Schwerdt, MarcoUNSPECIFIEDUNSPECIFIED
Date:13 January 2015
Journal or Publication Title:Progress In Electromagnetics Research B
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:61
Page Range:pp. 297-315
Publisher:EMW Publishing
ISSN:1937-6472
Status:Published
Keywords:SAR calibration; transponder; RCS
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 - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Döring, Björn
Deposited On:07 Nov 2014 10:41
Last Modified:30 May 2019 22:06

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