Surveillance for communication, navigation systems and air traffic management
Surveillance technology (CNS-ATM) is advancing from the legacy radar based solutions. To increase the area of Australia that is covered, a global navigation satellite system (GNSS) based automatic dependent surveillance - broadcast (ADS-B) is being implemented.
From 2 February 2017, all aircraft operating under the instrument flight rules will be required to be equipped with 1090 MHz extended squitter ADS-B. There is more information about aircraft surveillance below.
Another technology that is being used in some parts of Australia is multi-lateration. This system uses the existing transponder installed in the aircraft and a network of ground receivers to determine the aircraft's position by triangulation.