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Conceptual of the ADS-B system, illustrating radio links between aircraft, ground station and satellite. Automatic Dependent Surveillance–Broadcast (ADS-B) is an aviation surveillance technology and form of electronic conspicuity in which an aircraft determines its position via satellite navigation or other sensors and periodically broadcasts its position and other related data, enabling it ...
[citation needed] Although technically and operationally distinct, the ADS-B system is analogous to AIS and performs a similar function for aircraft. Information provided by AIS equipment, such as unique identification, position , course , and speed, can be displayed on a screen or an electronic chart display and information system (ECDIS).
In 2009 the ICAO published an "extended" form of Mode S with more message formats to use with ADS-B; [11] it was further refined in 2012. [12] Countries implementing ADS-B can require the use of either the extended squitter mode of a suitably-equipped Mode S transponder, or the UAT transponder on 978 MHz.
Secondary surveillance radar antenna (flat rectangle, top) mounted on an ASR-9 primary airport surveillance radar antenna (curved rectangle, bottom).. The need to be able to identify aircraft more easily and reliably led to another wartime radar development, the Identification Friend or Foe (IFF) system, which had been created as a means of positively identifying friendly aircraft from unknowns.
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Traffic information service – broadcast (TIS–B) is an aviation information service that allows pilots to see aircraft that are not emitting ADS-B data but have a basic transponder. As aircraft are discovered by primary radar and respond with encoded altitude information, this information is broadcast over ADS-B.
ATSSs working in the Automation specialty are tasked with the maintenance, modification, and operation of the computer workstations, displays, and associated network equipment, control workstations, and flight data processor used by Air Traffic Control Specialist to the safely, orderly, and efficiently move aircraft through the NAS.
ADS 1: Air data system ADS 2: Automatic dependent surveillance: ADS-A Automatic dependent surveillance – address ADS-B Automatic dependent surveillance – broadcast: ADS-C Automatic dependent surveillance – contract ADV Arbeitsgemeinschaft Deutscher Verkehrsflughäfen "German Airports Association" AEA Association of European Airlines: AESA