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Fully polarimetric microwave radiometer for remote sensing / J. Lahtinen in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1869 - 1878 Titre : Fully polarimetric microwave radiometer for remote sensing Type de document : Article/Communication Auteurs : J. Lahtinen, Auteur ; J. Pihflyckt, Auteur ; I. Mononen, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 1869 - 1878 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] instrument de mesure [Termes IGN] polarimétrie [Termes IGN] radiomètre à hyperfréquence [Termes IGN] télédétection en hyperfréquence [Termes IGN] vent Résumé : (Auteur) The design, characteristics, and operation of the Helsinki University of Technology Fully Polarimetric Radiometer (FPoR) are described. The developed 36.5-GHz radiometer can be used for airborne remote sensing ; however, ground-based and laboratory measurements are also possible. A direct crosscorrelation technique with analog correlators, which measures all four Stokes parameters simultaneously, is applied. This paper is the first successful demonstration of an analog direct crosscorrelation technique for polarimetric remote sensing radiometry. The radiometer was subjected to a variety of laboratory tests, and considerable attention is given to analysis of the characteristics of the instrument. Owing to the effective active temperature control system of the receiver, the radiometric stability of the instrument was found to be very high ; test results showing stabilities below 10 mK and of 440 mK on time scales of 800 and 8000 s, respectively, are presented. Furthermore, the absolute accuracy of the system is analyzed to be at a sub-Kelvin level for most measurement conditions. A maritime wind vector experiment was carried out over the Gulf of Finland. The feasibility and performance of the applied correlation technique and the whole radiometer system were verified for fully polarimetric airborne measurements. The obtained brightness temperatures of the first three Stokes parameters show typical harmonic behavior with respect to the surface wind ; the results suggest, however, that the model coefficients presented earlier for oceans may not be directly applicable for different conditions. Numéro de notice : A2003-279 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.813847 En ligne : https://doi.org/10.1109/TGRS.2003.813847 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22574 [article]

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