File:ESA Galileo Passive Hydrogen Maser.jpg

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English: Space Passive Hydrogen Maser used in ESA Galileo satellites as a master clock for an onboard timing system. This atomic clock type uses the ultra stable 1,420,405,751.7667 hertz (Hz) transition in a hydrogen atom to measure time to within 0.45 nanoseconds over 12 hours. A timing error of 1 nanosecond or 1 billionth of a second (10−9 or 1/1,000,000,000 s) results in a 29.9792458 cm (11.8 in) positional error on Earth's surface.
  • weight: 18 kg
  • volume: 45 liters
  • lifetime: 20 years
All the onboard clocks are mounted to the side of the hull kept in shadow, to minimise any temperature-based effects on performance.
Français : Maser passif spatial à hydrogène utilisé par l'ESA dans les satellites Galileo comme horloge maître pour un système de temps embarqué. Cette horloge atomique utilise la transition ultra stable à 1,420,405,751.7667 hertz (Hz) dans un atome d'hydrogène pour mesurer le temps à 0,45 nanosecondes près sur 12 heures. Une erreur de temps d'une nanoseconde ou 1 milliardième de seconde (10−9 ou 1/1,000,000,000 s) produit une erreur de position de 29,9792458 cm (11,8 in) sur la surface de la Terre.
  • poids : 18 kg
  • volume : 45 litres
  • durée de vie : 20 ans
Toutes les horloges embarquées sont montées sur le côté de la coque restant à l'ombre pour minimiser les impacts de la température sur les performances.
Polski: Pasywny maser wodorowy używany w satelitach Galileo jako główny zegar dla pokładowego systemu pomiaru czasu.
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current10:43, 31 January 2016Thumbnail for version as of 10:43, 31 January 20163,359 × 2,178 (696 KB)SkywalkerPL{{Information |Description ={{en|1=Space Passive Hydrogen Maser used in ESA Galileo satellites as a master clock for an onboard timing system.}} {{pl|1=Pasywny maser wodorowy używany w satelitach Galileo jako główny zegar dla pokładowego systemu...
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