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oai:recercat.cat:2117/229902025-07-17T14:09:02Zcom_2072_1033col_2072_452950

urn:hdl:2117/22990 Calibration methods in large interferometric radiometers devoted to earth observation Torres Torres, Francisco Camps Carmona, Adriano José Corbella Sanahuja, Ignasi Bará Temes, Francisco Javier Duffo Ubeda, Núria Vall-Llossera Ferran, Mercedes Magdalena Àrees temàtiques de la UPC::Enginyeria de la telecomunicació Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Oceanografia Radiation -- Measurement Soil moisture Radiació -- Mesurament Sòls -- Humitat This paper starts with a summary and classification of errors of any kind that corrupt the fundamental measurement performed by an InR (interferometric radiometer), the so-called visibilities. This summary is based on prior works from the authors concerning end-to-end rnodeling of the instrument. The paper follows with a trade-off analysis of the capability of different calibration approaches to remove those errors and, at the end, to recover a map of brightness temperatures. In order to perform the trade-off analysis, extensive simulations have been undertaken to analyze the approaches found in the literature: the redundant space method, used in radio astronomy, the G-matrix method, used in ESTAR, and the Noise injection method. both centralized and distributed, proposed for MIRAS. A short description is made of each one and a comparative table is presented. The trade off is presented in terms of what kind of errors can be removed by each method, hardware requirements, robustness and on-ground/on-board input data required to perform such error correction. Peer Reviewed Postprint (published version) 2000-01 Part of book or chapter of book http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy Attribution-NonCommercial-NoDerivs 3.0 Spain VSP