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Digital Beamforming for Spaceborne Reflector - Based Synthetic Aperture Radar, Part 2: Ultra-Wide Swath Imaging Mode

Younis, Marwan and Queiroz de Almeida, Felipe and Villano, Michelangelo and Huber, Sigurd and Krieger, Gerhard and Moreira, Alberto (2022) Digital Beamforming for Spaceborne Reflector - Based Synthetic Aperture Radar, Part 2: Ultra-Wide Swath Imaging Mode. IEEE Geoscience and Remote Sensing Magazine (GRSM), 10 (4). IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/MGRS.2022.3200871. ISSN 2168-6831.

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Official URL: https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2022/index.php#/p/10


Utilizing digital beamforming techniques in conjunction with the feed array of large deployable reflector antennas can boost the performance of synthetic aperture radar (SAR) systems. Multi-channel SAR overcomes the constraints of classical single-channel SAR allowing for wide-swath imaging at fine azimuth resolution. Part 1 of this tutorial provided an introduction to the instrument structure of a digital beamforming (DBF) imaging radar and the particularities/variants of its basic operation mode, known as single-beam scan-on-receive (SCORE), in which a time-variant high-gain receive beam is generated that follows the reflected echo traversing the ground. In its basic implementation, SCORE improves the signal-to-noise ratio and allows for the suppression of range ambiguities, but it does not allow for a substantial increase of the imaged swath width beyond a few tens of kilometers. Part 2 of the tutorial paper addresses the topic of ultra-wide swath imaging in the order of a few hundred kilometers, enabled through DBF. A detailed insight into simultaneous multiple sub-swath imaging is given; gaps (blind ranges) that occur in this operation mode are addressed; and the data streams management at the various on-board processing stages is explained, put in relation to the imaging mode, and expressions for the data rates are provided. A further beamforming topic seized in part 2 of this tutorial trilogy is the feed array excitation (complex weights) and the resulting primary and secondary radiation patterns. This is explained in the context of a reference reflector-feed antenna system providing numerous example cases aiming to foster the understanding of the topic.

Item URL in elib:https://elib.dlr.de/146764/
Document Type:Article
Additional Information:Part 2 of a three part tutorial-like paper.
Title:Digital Beamforming for Spaceborne Reflector - Based Synthetic Aperture Radar, Part 2: Ultra-Wide Swath Imaging Mode
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Younis, MarwanUNSPECIFIEDhttps://orcid.org/0000-0002-8563-7371UNSPECIFIED
Queiroz de Almeida, FelipeUNSPECIFIEDhttps://orcid.org/0000-0001-5929-6633UNSPECIFIED
Villano, MichelangeloUNSPECIFIEDhttps://orcid.org/0000-0002-1769-6927UNSPECIFIED
Huber, SigurdUNSPECIFIEDhttps://orcid.org/0000-0001-7097-5127UNSPECIFIED
Krieger, GerhardUNSPECIFIEDhttps://orcid.org/0000-0002-4548-0285UNSPECIFIED
Moreira, AlbertoUNSPECIFIEDhttps://orcid.org/0000-0002-3436-9653UNSPECIFIED
Date:28 October 2022
Journal or Publication Title:IEEE Geoscience and Remote Sensing Magazine (GRSM)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:synthetic aperture radar (SAR), digital-beam forming, reflector-based SAR
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 missions
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Younis, Dr.-Ing. Marwan
Deposited On:05 Dec 2021 14:07
Last Modified:14 Jun 2023 16:40

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