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In-Orbit Relative Amplitude and Phase Antenna Pattern Calibration for Tandem-L

Krieger, Gerhard and Huber, Sigurd and Younis, Marwan and Moreira, Alberto and Reimann, Jens and Klenk, Patrick and Zink, Manfred and Villano, Michelangelo and Queiroz de Almeida, Felipe (2018) In-Orbit Relative Amplitude and Phase Antenna Pattern Calibration for Tandem-L. In: Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR, pp. 421-426. VDE. European Conference on Synthetic Aperture Radar (EUSAR), 2018-06-04 - 2018-06-07, Aachen, Germany. ISBN ISBN 978-3-8007-4636-1 ISSN ISSN 2197-4403

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Abstract

Precise knowledge of the far-field antenna patterns associated with individual receive channels of a multichannel SAR system is of fundamental importance to operate the radar instrument in advanced imaging modes. A prominent example is Tandem-L which uses a large deployable parabolic reflector that is illuminated by a digital feed array with multiple receive channels. This architecture enables, in combination with an appropriate onboard signal processing, the acquisition of a wide image swath by simultaneously recording multiple scattered radar echoes with a set of narrow elevation beams that are steered in real time towards the angles of the arriving wavefronts. As such a multiple elevation beam technique is prone to range ambiguities, optimized real-time beamformers are considered that maximize their gain in the direction of the desired radar echo and suppress, at the same time, the range ambiguous radar echoes arriving from different angles. The implementation of these advanced real-time beamforming techniques requires, however, precise knowledge of the amplitude and phase of the secondary far-field antenna patterns associated with the excitation of single feed elements. As it is impossible to measure these complex antenna patterns on ground with sufficient accuracy, we propose here a novel technique that enables a highly accurate in-orbit measurement of the relative amplitude and phase of the far-field secondary antenna patterns associated with individual feed elements. The key idea is to collect SAR data in space by a set of dedicated calibration flights, where the signals from all feed elements are simultaneously recorded in a transparency mode, i.e., without any real-time beamforming on board the satellite. The multichannel data are then transferred to the ground, where the relative antenna pattern information is extracted and calibrated beamforming coefficients are derived, as required for the implementation of advanced SAR modes. This paper provides an overview of the proposed multichannel antenna calibration technique and demonstrates the superior SAR imaging performance that can be achieved by employing this technique in conjunction with a series of especially designed calibration flights over natural terrain with known topography.

Item URL in elib:https://elib.dlr.de/120575/
Document Type:Conference or Workshop Item (Speech)
Title:In-Orbit Relative Amplitude and Phase Antenna Pattern Calibration for Tandem-L
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krieger, GerhardGerhard.Krieger (at) dlr.dehttps://orcid.org/0000-0002-4548-0285
Huber, SigurdSigurd.Huber (at) dlr.dehttps://orcid.org/0000-0001-7097-5127
Younis, Marwanmarwan.younis (at) dlr.dehttps://orcid.org/0000-0002-8563-7371
Moreira, AlbertoAlberto.Moreira (at) dlr.dehttps://orcid.org/0000-0002-3436-9653
Reimann, Jensjens.reimann (at) dlr.dehttps://orcid.org/0000-0002-0650-9073
Klenk, PatrickPatrick.Klenk (at) dlr.deUNSPECIFIED
Zink, Manfredmanfred.zink (at) dlr.dehttps://orcid.org/0000-0002-4308-5636
Villano, MichelangeloMichelangelo.Villano (at) dlr.dehttps://orcid.org/0000-0002-1769-6927
Queiroz de Almeida, FelipeFelipe.QueirozdeAlmeida (at) dlr.dehttps://orcid.org/0000-0001-5929-6633
Date:June 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
Page Range:pp. 421-426
Publisher:VDE
ISSN:ISSN 2197-4403
ISBN:ISBN 978-3-8007-4636-1
Status:Published
Keywords:calibration, digital beamforming, antenna pattern, reflector antennas, multichannel-SAR.
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
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 - SAR-Missions, R - Vorhaben Entwicklung eines Mini-SAR, R - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Krieger, Dr.-Ing. Gerhard
Deposited On:27 Jun 2018 11:55
Last Modified:31 Jul 2019 20:18

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