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A Novel High-Resolution Wide-Swath SAR Imaging Mode Employing Multichannel Slow PRI Variation

Queiroz de Almeida, Felipe and Krieger, Gerhard (2018) A Novel High-Resolution Wide-Swath SAR Imaging Mode Employing Multichannel Slow PRI Variation. In: Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR. European Conference on Synthetic Aperture Radar (EUSAR), 2018-06-04 - 2018-06-07, Aachen, Germany.

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Abstract

High resolution and wide swath imaging are conflicting requirements in the design of spaceborne synthetic aperture radar (SAR) systems. Several studies have shown that this fundamental conflict can be resolved by advanced instrument modes and architectures employing multiple receive channels in elevation and/or azimuth. This paper introduces a new high-resolution wide-swath SAR imaging mode that uses multiple elevation and azimuth beams in combination with a slow variation of the pulse repetition interval (PRI). It is shown that this new mode enables the development of a highly performant SAR system with a rather compact antenna. As an example, the design of an L-band system is presented that is capable of imaging a 400 km wide swath with an azimuth resolution of 5 m in single polarization. A detailed analysis reveals that an excellent performance is achieved by combining a digital feed with 3 azimuth and 30 elevation channels using an unfurlable reflector that spans a diameter of 12 m. If compared to the staggered SAR mode of Tandem-L, which will employ a reflector with a diameter of 15 m, the required antenna aperture is reduced in the new mode by more than 35 %. Moreover, the same architecture enables the operation in a multichannel staggered SAR mode, which allows for the mapping of a 200 km wide swath with an even higher azimuth resolution of less than 2.5 m in a fully polarimetric mode.

Item URL in elib:https://elib.dlr.de/119283/
Document Type:Conference or Workshop Item (Speech)
Title:A Novel High-Resolution Wide-Swath SAR Imaging Mode Employing Multichannel Slow PRI Variation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Queiroz de Almeida, FelipeFelipe.QueirozdeAlmeida (at) dlr.dehttps://orcid.org/0000-0001-5929-6633
Krieger, GerhardGerhard.Krieger (at) dlr.dehttps://orcid.org/0000-0002-4548-0285
Date:2018
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:Yes
In ISI Web of Science:No
Status:Published
Keywords:High-resolution Wide-Swath SAR Digital Beamforming Slow PRI Variation
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Aachen, Germany
Event Type:international Conference
Event Dates:2018-06-04 - 2018-06-07
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 - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Queiroz de Almeida, Felipe
Deposited On:26 Mar 2018 10:49
Last Modified:31 Jul 2019 20:16

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