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On-Ground RFI Mitigation for Spaceborne Multichannel SAR Systems using Auxiliary Beams

Bollian, Tobias and Younis, Marwan and Krieger, Gerhard and Moreira, Alberto (2022) On-Ground RFI Mitigation for Spaceborne Multichannel SAR Systems using Auxiliary Beams. IEEE Transactions on Geoscience and Remote Sensing (52219). IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2022.3146789. ISSN 0196-2892.

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Official URL: https://ieeexplore.ieee.org/document/9693898


Radio Frequency Interference (RFI) has become a major concern for future Synthetic Aperture Radar (SAR) missions. Each occurence of interference introduces artifacts in the radar imagery, biasing the measurements and leading to erroneous results. In addition to conventional techniques, the use of multichannel SAR for RFI mitigation has been proposed because its Digital Beamforming (DBF) capability allows for a spatial filtering of the received signals. Thereby it becomes possible to remove RFI that arrives from a different direction than the SAR signal. Past publications on the topic presented highly flexible spatial filtering techniques. Those methods require either additional on-board processing or a substantial increase of the downlink capacity. This paper shows that by slightly reducing the flexibility of the spatial filtering, DBF can be utilized for RFI mitigation without either drawbacks: the processing is performed on-ground and the data volume remains manageable. This is achieved with auxiliary beams. Their concept and limitations are discussed in detail in this paper and are supported with simulated RFI mitigation results. Furthermore, it is shown that the information collected with an auxiliary beam can also be used to filter the RFI signal when it is spatially non-orthogonal to the SAR signal.

Item URL in elib:https://elib.dlr.de/141554/
Document Type:Article
Title:On-Ground RFI Mitigation for Spaceborne Multichannel SAR Systems using Auxiliary Beams
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bollian, TobiasUNSPECIFIEDhttps://orcid.org/0000-0003-4653-7930UNSPECIFIED
Younis, MarwanUNSPECIFIEDhttps://orcid.org/0000-0002-8563-7371UNSPECIFIED
Krieger, GerhardUNSPECIFIEDhttps://orcid.org/0000-0002-4548-0285UNSPECIFIED
Moreira, AlbertoUNSPECIFIEDhttps://orcid.org/0000-0002-3436-9653UNSPECIFIED
Date:26 January 2022
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Synthetic Aperture Radar, Radio Frequency Interference
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: Bollian, Tobias
Deposited On:17 Oct 2022 08:17
Last Modified:24 Jan 2023 12:34

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