AS 680/682
System Description Description, Operation and Maintenance
ADS−B
1−2 Ed. 10.07
1.1.1 Applications
Automatic Dependent Surveillance Broadcast (ADS−B) is a surveillance technology that uses posi-
tion information broadcast by aircraft as a basis for surveillance, rather than a radar scan to plot air-
borne targets. Aircraft (or vehicles) equipped with ADS−B transponders broadcast information con-
tinuously directly from the flight management system. This data is used to provide a very accurate
visual display containing information such as height, speed and identity, in a similar way to secondary
radar, but more detailed and comprehensive at a fraction of the cost. ADS−B offers other advantages
such as more frequent update rates and the potential to convey aircraft derived data such as spot
weather updates, aircraft intent and avionics data.
The ADS−B system serves the following benefits:
− Reduced Communication Congestion
− Enhanced Situational Awareness and Safety for Pilots
− Reduced Taxi/Takeoff Delays
− Expanded Surveillance, also on airport surface
− Reduced Cost
There are three kinds of ADS−B applications defined as follows:
− Air−to−Air Applications
Receiving the ADS−B data, the pilot is enabled to actually see other aircraft in his vicinity. This
Cockpit Display of Traffic Information (CDTI) is the basic technology which will enable the pilot to
electronically "see and avoid" other aircraft in a largely passive mode. Independent of ground
based radar CDTI will greatly enhance pilot situational awareness and lead to safer and more effi-
cient airspace operations. ADS−B techniques can also enhance traffic collision avoidance sys-
tems in the future.
− Air−to−Ground Applications
ADS−B is able to provide surveillance data to Air traffic Controllers and or aircraft operations facili-
ties on the ground. An aircraft in flight broadcasts its position, altitude, identification, and other per-
tinent information to Ground Stations that relay this data to Air Traffic Control or aircraft operations
facilities. This information is used to effectively establish surveillance in remote locations or extend
or even replace current surveillance capabilities. Air−to−Ground ADS−B can greatly assist con-
trollers and aircraft operations facilities with airspace management.
− Ground−to−Ground Applications
ADS−B provides accurate position and identification of aircraft and other equipped vehicles for
airport surface surveillance. Aircraft and vehicles, if suitably equipped, broadcast information con-
taining position, speed, heading and identification to Ground Stations located around the airport.
This information is relayed to air traffic controllers and airport management facilities personnel. Air-
port surface surveillance enhanced through the ADS−B Data Link application will lead to safer and
more efficient airport surface operations in all weather conditions.
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