Automatic Dependent Surveillance-Broadcast (ADS-B) Is a worldwide aviation system based on the 1090 MHz band spectrum used by aircraft to constantly broadcast, over a radio message their current, position, speed, altitude, and other flight parameters to receivers on the ground or in space (on satellites).
What does ADS-B mean?
ADS-B is automatic because no external trigger is required. It is dependent because it relies on on-board systems to provide surveillance information to other parties. Also, the data is broadcast, and the originating source has no knowledge of who receives the data and there is no interrogation.
Wide surveillance coverage.
Weather data can be displayed.
Reduced cost of surveillance infrastructure.
More efficient flight profiles such as air traffic spacing, separation, self-separation.