Surveillance technology is advancing from the legacy radar based solutions. To increase the area of Australia that is covered by surveillance, GNSS based Automatic Dependent Surveillance – Broadcast is being implemented. Another technology that is being employed for surveillance in some parts of Australia is Multi-Lateration, which is a system that makes use of the existing transponder installation in aircraft and a network of ground receivers to determine the aircraft position by triangulation.
From 12 December 2013 there is a progressive implementation of ADS-B in Australia until 2 February 2017 when all aircraft operating under the IFR will be required to be equipped with 1090 MHz Extended Squitter ADS-B. This section provides information on aircraft surveillance.