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Measurement of ionospheric Faraday rotation in simulated and real spaceborne SAR data


Jehle, M; Rüegg, M; Zuberbühler, L; Small, D; Meier, E (2009). Measurement of ionospheric Faraday rotation in simulated and real spaceborne SAR data. IEEE Transactions on Geoscience and Remote Sensing, 47(5):1512-1523.

Abstract

The influence of the atmosphere on a frequencymodulated
electromagnetic wave traversing the ionosphere is becoming increasingly important for recent and upcoming lowfrequency
and wide-bandwidth spaceborne synthetic aperture radar (SAR) systems. The ionized ionosphere induces Faraday
rotation (FR) at these frequencies that affects radar polarimetry and causes signal path delays resulting in a reduced range resolution.
The work at hand introduces a simulation model of SAR
signals passing through the atmosphere, including both frequencydependent FR and path delays. Based on simulation results from this model [proven with real Advanced Land Observing Satellite Phased Array L-band Synthetic Aperture Radar (PALSAR) data], estimation of FR in quad-polarized SAR data using the given approach is shown for raw, range-compressed, and focused radar images. Path delays and signal chirp bandwidth effects are considered.
Investigations discuss the suitability of raw and compressed
data versus combination of total electron content maps with the Earth’s magnetic field for FR estimation and deduced from a large number of analyzed PALSAR data sets.

Abstract

The influence of the atmosphere on a frequencymodulated
electromagnetic wave traversing the ionosphere is becoming increasingly important for recent and upcoming lowfrequency
and wide-bandwidth spaceborne synthetic aperture radar (SAR) systems. The ionized ionosphere induces Faraday
rotation (FR) at these frequencies that affects radar polarimetry and causes signal path delays resulting in a reduced range resolution.
The work at hand introduces a simulation model of SAR
signals passing through the atmosphere, including both frequencydependent FR and path delays. Based on simulation results from this model [proven with real Advanced Land Observing Satellite Phased Array L-band Synthetic Aperture Radar (PALSAR) data], estimation of FR in quad-polarized SAR data using the given approach is shown for raw, range-compressed, and focused radar images. Path delays and signal chirp bandwidth effects are considered.
Investigations discuss the suitability of raw and compressed
data versus combination of total electron content maps with the Earth’s magnetic field for FR estimation and deduced from a large number of analyzed PALSAR data sets.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:May 2009
Deposited On:30 Jan 2009 09:39
Last Modified:06 Dec 2017 16:00
Publisher:IEEE
ISSN:0196-2892
Publisher DOI:https://doi.org/10.1109/TGRS.2008.2004710
Related URLs:http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=36

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