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A Dual-Focus Reflector Antenna Concept for Spaceborne SAR Systems with Digital Beamforming

Huber, Sigurd and Younis, Marwan and Krieger, Gerhard and Moreira, Alberto (2013) A Dual-Focus Reflector Antenna Concept for Spaceborne SAR Systems with Digital Beamforming. IEEE Transactions on Antennas and Propagation. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TAP.2012.2229952 ISSN 0018-926X

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Abstract

Future spaceborne synthetic aperture radar (SAR) missions shall benefit from digital beamforming (DBF) techniques with the goal of generating high-resolution wide-swath imagery. The basic idea is to replace parts of the analog receiver hardware by digital components, increasing the flexibility of such systems. The limited transmit power rises the need of large antennas capable of electronically steering the antenna beam over a large angular domain. An innovative concept is the usage of large unfoldable mesh-reflector antennas in combination with digital feed arrays. An inherent problem of such systems is, that every feed element illuminates, after reflection from the main reflector, an essentially non-overlapping angular domain in the far field. In case of an element failure the radar system would be ’blind’ in the specific direction. To circumvent costly redundant receiver hardware a new approach to increase the reliability of such systems has been studied. The approach is based on a so called defocused reflector which grants visibility of the complete angular domain under failure conditions. This article presents the electromagnetic considerations leading to the defocused reflector concept. The performance of the defocused reflector system is evaluated in comparison to a conventional parabolic reflector system, utilizing digital beamforming techniques.

Item URL in elib:https://elib.dlr.de/79588/
Document Type:Article
Title:A Dual-Focus Reflector Antenna Concept for Spaceborne SAR Systems with Digital Beamforming
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Huber, SigurdUNSPECIFIEDUNSPECIFIED
Younis, MarwanUNSPECIFIEDUNSPECIFIED
Krieger, GerhardUNSPECIFIEDUNSPECIFIED
Moreira, AlbertoUNSPECIFIEDUNSPECIFIED
Date:March 2013
Journal or Publication Title:IEEE Transactions on Antennas and Propagation
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1109/TAP.2012.2229952
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0018-926X
Status:Published
Keywords:DBF, reflector antennas, SAR, defocused
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 - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Huber, Sigurd
Deposited On:10 Dec 2012 09:24
Last Modified:29 Jan 2019 14:59

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