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Monitoring GPS receiver and satellite clocks in real time: a network approach / François Lahaye in GPS world, vol 12 n° 11 (November 2001)

Public [article]  inGPS world > vol 12 n° 11 (November 2001) . - pp 44 - 50 Titre : Monitoring GPS receiver and satellite clocks in real time: a network approach Type de document : Article/Communication Auteurs : François Lahaye, Auteur ; P. Collins, Auteur ; Pierre Héroux, Auteur ; J. Popelar, Auteur Année de publication : 2001 Article en page(s) : pp 44 - 50 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] contrôle métrologique [Termes IGN] Global Positioning System [Termes IGN] poursuite de satellite [Termes IGN] récepteur GPS [Termes IGN] satellite GPS [Termes IGN] temps atomique international [Termes IGN] temps réel Résumé : (Auteur) The Global Positioning System is made possible, in large part, by the use of atomic frequency standards onboard the satellites and at the tracking stations here on the ground. These standards, both rubidium vapor cells and cesium beam tubes, control the timing and frequency of the signals emitted by the satellites. They possess the required characteristics of very high stability and high accuracy. Once set to the correct time, clocks driven by these standards maintain the correct time to within tiny fractions of a second for long periods. But no clock, not even an atomic one, is perfect. The performance of individual clocks in the satellites and at tracking stations is compared against GPS System Time which is a synthetic or"paper"time scale derived from the clocks in all of the satellites as well as those at the GPS Control Segment tracking stations. This time scale is kept closely aligned to Coordinated Universal Time (UTC) as maintained at the US. Naval Observatory (ignoring UTC leapseconds). In addition to the use of GPS for the monitoring and maintenance of the system clocks, GPS is used by the wider precise time and time interval community for synchronizing clocks and frequency standards around the globe. In this article, a team of researchers from the Geodetic Survey Division of Natural Resources Canada describes a technique they have developed for monitoring the performance of both GPS receiver and satellite clocks in real-time using a regional network of tracking stations. Numéro de notice : A2001-129 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21825 [article]

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