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dc.contributor.authorCorbella Sanahuja, Ignasi
dc.contributor.authorTorres Torres, Francisco
dc.contributor.authorCamps Carmona, Adriano José
dc.contributor.authorDuffo Ubeda, Núria
dc.contributor.authorVall-Llossera Ferran, Mercedes Magdalena
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.identifier.citationCorbella, I.; Torres, F.; Camps, A.; Duffon N.; Vall-llosera, M. Brightness-temperature retrival methods in synthetic aperture radiometers. IEEE Transactions on Geoscience and Remote Sensing, 2009, vol. 47, p. 285-294.
dc.description.abstractBightness-temperature retrieval techniques for synthetic aperture radiometers are reviewed. Three different approaches to combine measured visibility and antenna temperatures, along with instrument characterization data, into a general equation to invert are presented. Discretization and windowing techniques are briefly discussed, and formulas for reciprocal grids using rectangular and hexagonal samplings are given. Two known techniques are used to invert the equation, namely, inverse Fourier transform and G-matrix pseudoinverse. The proposed preprocessing approaches combined with these two inversion methods are implemented with real data measured by an airborne Y-shaped interferometric radiometer over land and water, and are compared. The images indicate that best results are obtained when inverting an incremental visibility obtained after substracting a term that includes the individual antenna temperatures, the physical temperatures of the receivers, and a flat-target response directly measured from cold-sky looks.
dc.format.extent10 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques
dc.subject.lcshRadiation -- Measurement -- Instruments
dc.subject.otherAntenna temperatures
dc.subject.otherAtmospheric radiation
dc.subject.otherDiscretization technique
dc.subject.otherG-matrix pseudoinverse
dc.subject.otherInverse Fourier transform
dc.subject.otherRadar imaging
dc.subject.otherRadar Interferometry
dc.subject.otherReciprocal grids
dc.subject.otherSynthetic aperture radiometers
dc.subject.otherWindowing technique
dc.subject.otherY-shaped interferometric radiometer
dc.titleBrightness-temperature retrival methods in synthetic aperture radiometers
dc.contributor.groupUniversitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access

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