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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.
Aircraft carry ADS-B transponders, which transmit information such as the aircraft ID, GPS position, and altitude as radio signals. These radio transmission are collected by civilian ADS-B receivers located in the vicinity of the aircraft. These ADS-B receivers are only able to collect information on flights within radio-range of their position ...
America Online CEO Stephen M. Case, left, and Time Warner CEO Gerald M. Levin listen to senators' opening statements during a hearing before the Senate Judiciary Committee on the merger of the two ...
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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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