Compact Polarimetry at longer wavelengths – calibration

Konferenz: EUSAR 2008 - 7th European Conference on Synthetic Aperture Radar
02.06.2008 - 05.06.2008 in Friedrichshafen, Germany

Tagungsband: EUSAR 2008

Seiten: 4Sprache: EnglischTyp: PDF

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Freeman, A. (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA)
Dubois-Fernandez, P.; Truong-Loï, My-Linh (ONERA, DEMR, Centre de Salon de Provence, BA701, 13661 Salon Air cedex, France)

At longer wavelengths, which are subject to Faraday rotation as they pass through the ionosphere, it can be argued that a circular polarization transmit, linear (H, V) receive implementation of a SAR employing compact polarimetry is the optimum dual-polarized configuration. In this paper, we develop a system model for this implementation of compact polarimetry, and address calibration of such a system. We describe a viable internal/external calibration approach and suggest how the calibration may be verified. Impacts of residual calibration errors on some key applications, such as soil moisture estimation and forest height retrievals, are also considered.