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Future time : opportunities for using optical clocks in GNSS systems / A. Moudrak in Inside GNSS, vol 3 n° 6 (September 2008) 

Public [article]  inInside GNSS > vol 3 n° 6 (September 2008) . - 6 p. ; pp 45 - 50 Titre : Future time : opportunities for using optical clocks in GNSS systems Type de document : Article/Communication Auteurs : A. Moudrak, Auteur ; H. Klein, Auteur ; Bernd Eissfeller, Auteur Année de publication : 2008 Article en page(s) : 6 p. ; pp 45 - 50 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Global Navigation Satellite System [Termes IGN] horloge [Termes IGN] secteur spatial Résumé : (Auteur) Satellite clock prediction accuracy may be considerably improved with the emerging optical clock technology. To maximize the performance benefits, optical clocks should be placed onboard the satellites (and on ground to generate the system time). Implementation of optical clocks to keep the system time could increase the accuracy of Galileo timing service (dissemination of UTC) and keep the UTC prediction function within the system. In this case, dependence on an external infrastructure such as the TSP may be reduced. If other contributions to the error budget (mainly, the multipath) were reduced, we might anticipate further significant benefits to user positioning accuracy from improved clock technology, for instance, through exploitation of carrier phase techniques. Placing better clocks on satellites will reduce the need for frequent updates, which will simplify the requirements on ground systems and also reduce costs. If update links were to fail for a significant amount of time, having very good clocks in the space segment would reduce the rate of degradation of the service to users on the ground. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-678 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33531 [article]

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