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| High Frequency Data Link ： ウィキペディア英語版 |
High Frequency Data Link
High Frequency Data Link (HFDL) is an ACARS communications media used to exchange data such as Aeronautical Operational Control (AOC) messages, Controller Pilot Data Link Communications (CPDLC) messages and Automatic Dependent Surveillance (ADS) messages between aircraft end-systems and corresponding ground-based HFDL ground stations. Using the unique propagation characteristics of high-frequency radio waves, the ground stations provide data link communications to properly equipped aircraft operating anywhere in the world. The result, pilots can always communicate with someone on the ground.
==Avionics Supporting HFDL==
To use the service, an aircraft only needs a Communications Management Unit (CMU), or equivalent and an HFDL data radio. The CMU is an airborne communications router that interfaces with many aircraft communications systems including SATCOM, VHF, HFDL, FMS and others.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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