Automatic Dependent Surveillance-Broadcast (ADS-B)

Automatic Dependent Surveillance-Broadcast (ADS-B) is a high accurate coordinated surveillance technology for tracking aircrafts. The aircraft periodically transmits it’s location information; determine by the aircraft’s GPS navigation system together with few other navigational, telemetry and identification information via a radio frequency (Typically 1090 MHz).

http://en.wikipedia.org/wiki/Automatic_dependent_surveillance-broadcast

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