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Automatic Dependent Surveillance–Broadcast (ADS-B) is a surveillance system combining the advanced technologies of satellite positioning, aircraft avionics, and ground based transceivers. ADS-B equipped aircraft automatically broadcast their identification, current position, altitude, and velocity information approximately once per second. This continuous broadcast of flight data, improves aircraft position accuracy beyond the capabilities of current NAS radar/transponder based surveillance systems.
In the United States, two different data links have been adopted for use with ADS−B: 1090 MHz Extended Squitter (1090ES) and the 978 MHz, Universal Access Transceiver (UAT). The 1090ES link is intended for aircraft that primarily operate at FL240 and above, whereas the UAT link is intended for use by aircraft that primarily operate at lower altitudes. From a pilot’s standpoint, the two links operate similarly and support ADS−B and Traffic Information Services-Broadcast (TIS-B). The UAT link will provide additional weather and other aeronautical information through the Flight Information Service − Broadcast (FIS-B).
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