Meyer, Franz Josef and Bamler, Richard and Jakowski, Norbert and 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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Official URL: http://earth.esa.int/workshops/fringe2005/participants/81/paper_franz_meyer_etal_fringe05_iono.pdf
Abstract
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.
Item URL in elib: | https://elib.dlr.de/22229/ | |||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | |||||||||||||||
Title: | The Potential of Broadband L-Band SAR Systems for Small Scale Ionospheric TEC Mapping | |||||||||||||||
Authors: |
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Date: | November 2005 | |||||||||||||||
Journal or Publication Title: | Proceedings of the International ESA Workshop on SAR Interferometry Fringe05 | |||||||||||||||
Refereed publication: | No | |||||||||||||||
Open Access: | No | |||||||||||||||
Gold Open Access: | No | |||||||||||||||
In SCOPUS: | No | |||||||||||||||
In ISI Web of Science: | No | |||||||||||||||
Editors: |
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Status: | Published | |||||||||||||||
Keywords: | ionosphere, InSAR, atmospheric effects, SAR, atmospheric monitoring, L-band SAR Systems | |||||||||||||||
Event Title: | ESA Workshop Fringe05 | |||||||||||||||
Event Location: | Frascati, Italy | |||||||||||||||
Event Type: | international Conference | |||||||||||||||
Event Dates: | 2005-11-28 - 2005-12-02 | |||||||||||||||
Organizer: | European Space Agency ESA | |||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | |||||||||||||||
HGF - Program: | Space (old) | |||||||||||||||
HGF - Program Themes: | W EO - Erdbeobachtung | |||||||||||||||
DLR - Research area: | Space | |||||||||||||||
DLR - Program: | W EO - Erdbeobachtung | |||||||||||||||
DLR - Research theme (Project): | W - Vorhaben Bildwissenschaften (old) | |||||||||||||||
Location: | Oberpfaffenhofen | |||||||||||||||
Institutes and Institutions: | Remote Sensing Technology Institute > Image Science | |||||||||||||||
Deposited By: | Meyer, Dr.-Ing. Franz Josef | |||||||||||||||
Deposited On: | 03 Feb 2006 | |||||||||||||||
Last Modified: | 27 Apr 2009 04:59 |
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