On the use of Symmetric Target Tilt Angle for PALSAR Calibration

PALSAR L-band SAR will be affected by Faraday rotation. In this study, PALSAR system is briefly described, and the Freeman calibration method is considered for PALSAR calibration. However, this method requires the deployment of a minimum of one corner reflector (CR) for the calibration of each scene...

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Bibliographic Details
Published in2006 IEEE International Symposium on Geoscience and Remote Sensing pp. 340 - 343
Main Authors Touzi, R., Shimada, M., Papathanassiou, K., Corr, D.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2006
Subjects
Antenna measurements
Calibration
Chromium
Gain measurement
Goniometers
L-band
Layout
Polarization
Rotation measurement
Scattering parameters
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Summary:PALSAR L-band SAR will be affected by Faraday rotation. In this study, PALSAR system is briefly described, and the Freeman calibration method is considered for PALSAR calibration. However, this method requires the deployment of a minimum of one corner reflector (CR) for the calibration of each scene, and this is not convenient in practice. In this paper, the use of human-made and natural symmetric targets is investigated for the calibration of SAR subject to Faraday rotation. The target scattering vector model (TSVM), which permits a unified decomposition of point and distributed target scattering, is used to derive a new calibration method that does not require the deployment of CRs. It is shown that the orientation (i.e. target tilt angle) and roll invariant maximum polarization parameters of symmetric target scattering can be used to measure and remove Faraday rotation and channel imbalance errors from PALSAR data. Antenna gain and cross-talk incidence angle variations are measured using data acquisitions over the Amazonian forests, under low Faraday rotation conditions.
ISBN:0780395107
9780780395107
ISSN:2153-6996
DOI:10.1109/IGARSS.2006.92