airborne collision avoidance system

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airborne collision avoidance system

[′er‚bȯrn kə′lizh·ən ə′vȯid·əns ‚sis·təm]
(navigation)
A navigation system for preventing collisions between aircraft that relies primarily on equipment carried on the aircraft itself, but which may make use of equipment already employed in the ground-based air-traffic control system. Abbreviated ACAS.

airborne collision avoidance system (ACAS)

airborne collision avoidance system (ACAS)click for a larger image
Typical function block diagram of airborne collision avoidance system.
An aircraft system based on SSR (secondary surveillance radar) transponder signals which operates independently of ground-based equipments to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders (ICAO). The system alerts the pilot to conflicting air traffic.
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