Bojarski, Allan und Bachmann, Markus und Kraus, Thomas und Reimann, Jens und Breit, Helko und Balss, Ulrich (2020) IQ Bias Channel Deviation on TerraSAR-X and TanDEM-X. European Conference on Synthetic Aperture Radar (EUSAR), 2020-06-15 - 2020-06-18, Leipzig, Germany.
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Kurzfassung
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.
elib-URL des Eintrags: | https://elib.dlr.de/133994/ | ||||||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||||||
Titel: | IQ Bias Channel Deviation on TerraSAR-X and TanDEM-X | ||||||||||||||||||||||||||||
Autoren: |
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Datum: | 2020 | ||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||||||
Status: | akzeptierter Beitrag | ||||||||||||||||||||||||||||
Stichwörter: | IQ-Bias, TerraSAR-X, TanDEM-X, Long Term Systems Monitoring, | ||||||||||||||||||||||||||||
Veranstaltungstitel: | European Conference on Synthetic Aperture Radar (EUSAR) | ||||||||||||||||||||||||||||
Veranstaltungsort: | Leipzig, Germany | ||||||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||||||
Veranstaltungsdatum: | 2020-06-15 - 2020-06-18 | ||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||||||||||||||
HGF - Programmthema: | Erdbeobachtung | ||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | R EO - Erdbeobachtung | ||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Projekt TanDEM-X (alt) | ||||||||||||||||||||||||||||
Standort: | Oberpfaffenhofen | ||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Hochfrequenztechnik und Radarsysteme > Satelliten-SAR-Systeme | ||||||||||||||||||||||||||||
Hinterlegt von: | Bojarski, Allan | ||||||||||||||||||||||||||||
Hinterlegt am: | 03 Feb 2020 15:11 | ||||||||||||||||||||||||||||
Letzte Änderung: | 29 Mär 2023 00:45 |
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- IQ Bias Channel Deviation on TerraSAR-X and TanDEM-X. (deposited 03 Feb 2020 15:11) [Gegenwärtig angezeigt]
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