Ce glossaire est rédigé pour une utilisation dans le cadre d’une compagnie aérienne virtuelle et de la simulation de vol au sein de Virtual Air Canada Airline. Il ne constitue pas une référence en aviation réelle.
La radio haute fréquence (HF) désigne la bande de fréquences radio entre 3 et 30 MHz utilisée pour les communications vocales et de données à longue portée en aviation. Contrairement au VHF, qui repose sur la propagation en ligne de vue et est limité à environ 200 milles nautiques, les signaux HF rebondissent sur l’ionosphère et peuvent atteindre des milliers de miles, faisant du HF la méthode de communication principale pour les opérations océaniques et les zones éloignées. Les aéronefs traversant l’Atlantique Nord, le Pacifique ou opérant sur des routes polaires dépendent du HF pour maintenir le contact avec les centres de contrôle des zones océaniques lorsqu’ils sont hors de portée VHF.La communication HF a des limitations pratiques : l’ionosphère change avec l’heure du jour, la saison et l’activité solaire, signifiant qu’une fréquence qui fonctionne bien le matin peut être inutilisable en après-midi. Les pilotes et contrôleurs utilisent le selcal (appel sélectif) pour gérer le bruit statique et de fond constant en alertant l’équipage uniquement lorsqu’une station au sol appelle leur aéronef spécifique. Le HFDL (HF Data Link) complète les communications vocales avec de la messagerie numérique sur les mêmes bandes de fréquences, améliorant la fiabilité pour les transmissions de type ACARS sur les routes océaniques.
Dans les opérations de la compagnie aérienne virtuelle
En simulation de vol, la radio HF est pertinente lors des vols sur routes océaniques telles que les tracks de l’Atlantique Nord chez Virtual Air Canada Airline. Certains simulateurs et modules modélisent la communication HF à travers des réseaux comme VATSIM ou POSCON, où les contrôleurs peuvent couvrir des positions océaniques nécessitant des rapports de position de type HF. Comprendre les procédures HF, incluant les formats de rapport de position et la surveillance selcal, améliore le réalisme sur les vols long-courrier internationaux.
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