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The Potential of Broadband L-Band SAR Systems for Small Scale Ionospheric TEC Mapping

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.

Full text not available from this repository.

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.

Document Type:Conference or Workshop Item (Speech)
Title:The Potential of Broadband L-Band SAR Systems for Small Scale Ionospheric TEC Mapping
Authors:
AuthorsInstitution or Email of Authors
Meyer, Franz JosefUNSPECIFIED
Bamler, RichardUNSPECIFIED
Jakowski, NorbertUNSPECIFIED
Fritz, ThomasUNSPECIFIED
Date:November 2005
Journal or Publication Title:Proceedings of the International ESA Workshop on SAR Interferometry Fringe05
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
ESA, UNSPECIFIED
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: Dr.-Ing. Franz Josef Meyer
Deposited On:03 Feb 2006
Last Modified:27 Apr 2009 04:59

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