Meyer, Franz Josef und Bamler, Richard und Jakowski, Norbert und Fritz, Thomas (2005) The Potential of Broadband L-Band SAR Systems for Small Scale Ionospheric TEC Mapping. In: Proceedings of the International ESA Workshop on SAR Interferometry Fringe05. ESA Workshop Fringe05, 2005-11-28 - 2005-12-02, Frascati, Italy.
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Offizielle URL: http://earth.esa.int/workshops/fringe2005/participants/81/paper_franz_meyer_etal_fringe05_iono.pdf
Kurzfassung
Ionospheric effects have a significant impact on broadband L-band SAR systems. Range delay, range defocussing and Faraday rotation are the most prominent. All effects are a function of the number of free electrons in the ionosphere, counted along the the ray-path of the SAR signal. Methods based on 2-frequency GPS observations allow to measure the number of free electrons in the ionosphere with a high temporal resolution. The spatial resolution however is coarse due to the low density of GPS ground stations. In this paper we investigate the potential of broadband L-band SAR systems for ionospheric mapping. As a basis, ionospheric effects on traversing broadband microwave radiation are theoretically derived and analyzed. Starting from that, we estimate the effects imposed on SAR images for a variety of carrier frequencies and systems bandwidths. As the ionosphere especially affects low frequency systems, our main emphasis is put on the analysis of upcoming spaceborne L-band SAR systems. Additionally, we emphasize the idea to make use of the high sensitivity of L-band SAR systems with respect to the ionosphere for estimating its electron content from SAR data. In particular, we propose two different algorithms: i) Using a geolocation procedure to exploit the differential range shift between observations with different ionospheric conditions; ii) Analyzing the spread of the impulse response function in range direction, in order to measure the absolute electron density in the ionosphere.
Dokumentart: | Konferenzbeitrag (Vortrag) | |||||||||||||||
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Titel: | The Potential of Broadband L-Band SAR Systems for Small Scale Ionospheric TEC Mapping | |||||||||||||||
Autoren: |
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Datum: | November 2005 | |||||||||||||||
Erschienen in: | Proceedings of the International ESA Workshop on SAR Interferometry Fringe05 | |||||||||||||||
Referierte Publikation: | Nein | |||||||||||||||
In Open Access: | Nein | |||||||||||||||
In SCOPUS: | Nein | |||||||||||||||
In ISI Web of Science: | Nein | |||||||||||||||
Herausgeber: |
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Status: | veröffentlicht | |||||||||||||||
Stichwörter: | ionosphere, InSAR, atmospheric effects, SAR, atmospheric monitoring, L-band SAR Systems | |||||||||||||||
Veranstaltungstitel: | ESA Workshop Fringe05 | |||||||||||||||
Veranstaltungsort: | Frascati, Italy | |||||||||||||||
Veranstaltungsart: | internationale Konferenz | |||||||||||||||
Veranstaltungsdatum: | 2005-11-28 - 2005-12-02 | |||||||||||||||
Veranstalter : | European Space Agency ESA | |||||||||||||||
HGF - Forschungsbereich: | Verkehr und Weltraum (alt) | |||||||||||||||
HGF - Programm: | Weltraum (alt) | |||||||||||||||
HGF - Programmthema: | W EO - Erdbeobachtung | |||||||||||||||
DLR - Schwerpunkt: | Weltraum | |||||||||||||||
DLR - Forschungsgebiet: | W EO - Erdbeobachtung | |||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | W - Vorhaben Bildwissenschaften (alt) | |||||||||||||||
Standort: | Oberpfaffenhofen | |||||||||||||||
Institute & Einrichtungen: | Institut für Methodik der Fernerkundung > Bildwissenschaften | |||||||||||||||
Hinterlegt von: | Meyer, Dr.-Ing. Franz Josef | |||||||||||||||
Hinterlegt am: | 03 Feb 2006 | |||||||||||||||
Letzte Änderung: | 27 Apr 2009 04:59 |
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