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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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.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||The Potential of Broadband L-Band SAR Systems for Small Scale Ionospheric TEC Mapping|
|Journal or Publication Title:||Proceedings of the International ESA Workshop on SAR Interferometry Fringe05|
|In ISI Web of Science:||No|
|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)|
|Institutes and Institutions:||Remote Sensing Technology Institute > Image Science|
|Deposited By:||Dr.-Ing. Franz Josef Meyer|
|Deposited On:||03 Feb 2006|
|Last Modified:||27 Apr 2009 04:59|
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