The Potential of Low-Frequency SAR Systems for Mapping Ionospheric TEC Distributions
Meyer, Franz Josef and Bamler, Richard and Jakowski, Norbert and Fritz, Thomas (2006) The Potential of Low-Frequency SAR Systems for Mapping Ionospheric TEC Distributions. IEEE Geoscience and Remote Sensing Letters, 3 (4), pp. 560-564. DOI: 10.1109/LGRS.2006.882148. ISSN 1545-598X.
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Ionospheric propagation effects have a significant impact on the signal properties of low-frequency synthetic aperture radar (SAR) systems. Range delay, interferometric phase bias, range defocusing, and Faraday rotation are the most prominent ones. All the effects are a function of the so-called total electron content (TEC). Methods based on two-frequency global positioning system observations allow measuring TEC in the ionosphere with coarse spatial resolution only. In this letter, the potential of broadband L-band SAR systems for ionospheric TEC mapping is studied. As a basis, the dispersive nature of the ionosphere and its effects on broadband microwave radiation are theoretically derived and analyzed. It is shown that phase advance and group delay can be measured by interferometric and correlation techniques, respectively. The achievable accuracy suffices in mapping small-scale ionospheric TEC disturbances. A differential TEC estimator that separates ionospheric from tropospheric contributions is proposed.
|Title:||The Potential of Low-Frequency SAR Systems for Mapping Ionospheric TEC Distributions|
|Journal or Publication Title:||IEEE Geoscience and Remote Sensing Letters|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 560-564|
|Keywords:||Atmospheric effects, L-band SAR, SAR interferometry, correlation, dispersive media, ionosphere, synthetic aperture radar (SAR), total electron content (TEC)|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|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|
Institute of Communication and Navigation
|Deposited By:||Dr.-Ing. Franz Josef Meyer|
|Deposited On:||31 Oct 2006|
|Last Modified:||27 Apr 2009 13:12|
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