Title:
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A calibration method for fully polarimetric microwave radiometers
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Author:
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Lahtinen, J..; Gasiewski, A.J.; Klein, M.; Corbella Sanahuja, Ignasi
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció |
Abstract:
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A technique for absolute end-to-end calibration
of a fully polarimetric microwave radiometer is presented. The
technique is based on the tripolarimetric calibration technique
of Gasiewski and Kunkee, but is extended to provide a means of
calibrating all four Stokes parameters. The extension is facilitated
using a biaxial phase-retarding microwave plate to provide a
precisely known fourth Stokes signal from the Gasiewski–Kunkee
(GK) linearly polarized standard. The relations needed to determine
the Stokes vector produced by the augmented standard
are presented, and the effects of nonidealities in the various
components are discussed. The application of the extended
standard to determining the complete set of radiometer constants
(the calibration matrix elements) for the National Oceanic and
Atmospheric Administration Polarimetric Scanning Radiometer
in a laboratory environment is illustrated. A calibration matrix
inversion technique and error analysis are described, as well. The
uncertainties associated with practical implementation of the fully
polarimetric standard for spaceborne wind vector measurements
are discussed relative to error thresholds anticipated for wind
vector retrieval from the U.S. National Polar-Orbiting Environmental
Satellite System. |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació -Calibration -Signal theory (Telecommunication) -Dielectric devices -Microwave remote sensing -Microones -Senyal, Teoria del (Telecomunicació) |
Rights:
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Document type:
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Article - Published version Article |
Published by:
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IEEE Press. Institute of Electrical and Electronics Engineers
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