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IQ Bias Channel Deviation on TerraSAR-X and TanDEM-X

Bojarski, Allan and Bachmann, Markus and Kraus, Thomas and Reimann, Jens and Breit, Helko and Balss, Ulrich (2021) IQ Bias Channel Deviation on TerraSAR-X and TanDEM-X. In: Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR. European Conference on Synthetic Aperture Radar (EUSAR), 2021-03-29 - 2021-04-01, Leipzig (virtual), Germany. ISSN 2197-4403.

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The SAR satellites TerraSAR-X and TanDEM-X are experiencing periodically varying solar conditions due to their orbit geometry. As a consequence multiple system parameters are affected by these variations mainly induced by corresponding temperature fluctuation. A long-term analysis has been conducted showing that in particular one parameter, the in-phase and quadrature bias (IQ bias), deviates considerably from expected results. This deviation occurs between the respective channels and also between both spacecraft. In order to identify the driving mechanisms behind this behaviour, the signal path between the antenna front-end and the analogue to digital conversion (ADC) block is analysed, putting a special focus on the IQ demodulation block. Within this block, mixer imbalances are the main contributors to the observed behaviour and provide an explanation for the differing channel outputs. The mixer is also the reason for IQ bias deviations between the satellites since the channel imbalance shows a reversed tendency when comparing both systems. Although the effects are corrected in calibration, the results provide valuable information to interpret monitoring results and to gain a deeper understanding of the system.

Item URL in elib:https://elib.dlr.de/137236/
Document Type:Conference or Workshop Item (Speech, Poster)
Title:IQ Bias Channel Deviation on TerraSAR-X and TanDEM-X
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bojarski, AllanUNSPECIFIEDhttps://orcid.org/0000-0002-6729-6665UNSPECIFIED
Bachmann, MarkusUNSPECIFIEDhttps://orcid.org/0000-0002-6028-4303UNSPECIFIED
Kraus, ThomasUNSPECIFIEDhttps://orcid.org/0000-0002-9486-7371UNSPECIFIED
Reimann, JensUNSPECIFIEDhttps://orcid.org/0000-0002-0650-9073UNSPECIFIED
Balss, UlrichUNSPECIFIEDhttps://orcid.org/0009-0004-2996-6842UNSPECIFIED
Date:30 March 2021
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 ISI Web of Science:No
Keywords:IQ-Bias, TerraSAR-X, TanDEM-X, Long Term Systems Monitoring,
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Leipzig (virtual), Germany
Event Type:international Conference
Event Start Date:29 March 2021
Event End Date:1 April 2021
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 - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Bojarski, Allan
Deposited On:05 Nov 2020 12:40
Last Modified:24 Apr 2024 20:39

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