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Optical signal processor for millimeter-wave interferometric radiometry / Enrique Nova in IEEE Transactions on geoscience and remote sensing, vol 52 n° 5 tome 1 (May 2014)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 52 n° 5 tome 1 (May 2014) . - pp 2357 - 2368 Titre : Optical signal processor for millimeter-wave interferometric radiometry Type de document : Article/Communication Auteurs : Enrique Nova, Auteur ; Jordi Romeu, Auteur ; Santiago Capdevila, Auteur ; Francesc Torres, Auteur ; Lluis Hofre, Auteur Année de publication : 2014 Article en page(s) : pp 2357 - 2368 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] bande W [Termes IGN] corrélation [Termes IGN] interférométrie [Termes IGN] ondelette Résumé : (Auteur) In interferometric radiometry, the correlations between all pairs of radio-frequency (RF) receivers must be performed in order to obtain the scene visibilities. This represents a cumbersome problem in passive imaging where large signal bandwidths are typically required to achieve fast-acquisition times and improve the radiometric resolution of the image. In this case, the signal distribution and the correlation at intermediate frequencies require very fast signal acquisition and processing subsystems. This paper presents a technique to perform correlations of millimeter-wave signals produced by thermal emission in the optical domain as a solution to the aforementioned problem. The proposed method is based on converting the RF signal to the optical domain by modulating a laser beam with the RF signal using a LiNbO3 phase modulator. This conversion allows to perform the signal distribution in the optical domain to obtain the combination of the receiver pairs. The correlation is obtained by measuring the power of the photocurrent produced by photodetecting the combined signal. The results of an experimental validation consisting on the acquisition of passive images using a linear interferometric array are presented to support the feasibility of the method. In addition, performance considerations of the system have been developed and validated by calculating the standard deviation of a visibility measurement. Numéro de notice : A2014-260 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2013.2260164 Date de publication en ligne : 26/06/2013 En ligne : https://doi.org/10.1109/TGRS.2013.2260164 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33163 [article]

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