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Satellite constellation with direct radio measurements for atmospheric studies : WATS mission case / G. Alberti in International Journal of Remote Sensing IJRS, vol 25 n° 18 (September 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 18 (September 2004) . - pp 3703 - 3730 Titre : Satellite constellation with direct radio measurements for atmospheric studies : WATS mission case Type de document : Article/Communication Auteurs : G. Alberti, Auteur ; G.B. Amata, Auteur ; F. Amisano, Auteur Année de publication : 2004 Article en page(s) : pp 3703 - 3730 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Missions spatiales [Termes IGN] Agence spatiale européenne [Termes IGN] antenne [Termes IGN] distribution spatiale [Termes IGN] étude de faisabilité [Termes IGN] mission spatiale [Termes IGN] onde radioélectrique [Termes IGN] orbite basse [Termes IGN] positionnement par GNSS [Termes IGN] radiooccultation [Termes IGN] rayonnement électromagnétique [Termes IGN] rayonnement radioélectrique [Termes IGN] récepteur [Termes IGN] réfraction atmosphérique [Termes IGN] stratosphère [Termes IGN] teneur en vapeur d'eau [Termes IGN] transmission de données [Termes IGN] troposphère [Termes IGN] vapeur d'eau [Termes IGN] vent [Termes IGN] Water Vapour and Wind in Atmospheric Troposphere and Stratosphere Résumé : (Auteur) This paper shows the main results of a pre-feasibility study commissioned by the European Space Agency (ESA) in the framework of the Earth Explorer Core Mission programme. The analysed mission is called WATS (Water vapour and wind in Atmospheric Troposphere and Stratosphere) and aims to monitor variations and changes in the global atmospheric water vapour distribution and lower-stratosphere/upper-troposphere winds. Starting from a set of scientific requirements, the present work shows the main results of the mission analysis in terms of the number and spatial distribution of possible measurements. By performing trade-off with respect to expected values, the number of satellites forming the constellation has been fixed as well as the main orbital parameters, also taking into account degradations within the maximum expected mission lifetime. To assess the accuracy of the final measurement, a suitable performance model has been established that takes into account the effects of both the radio propagation of the signal through the atmosphere and the instrument receiving chain. The results obtained by running such a performance model are presented and discussed in order to assess the main system parameters mainly in terms of minimum transmitted power. Following, a sensitivity analysis is presented that shows the effects of antenna pointing error, receiver gain fluctuation, effective antenna size and pre-detection bandwidth. Numéro de notice : A2004-357 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160410001680392 En ligne : https://doi.org/10.1080/01431160410001680392 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26884 [article]

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