Introduction and Analysis of Traffic Alert and Collision Avoidance System(TCAS Ⅱ)
TCAS is a family of airborne devices that function independently of the ground-based air traffic control(ATC)system,and provides collision avoidance protection for a broad spectrum of aircraft types.All TCAS systems provide some degree of collision threat alerting and a traffic display.A TCAS Ⅱ installation consists of the following major components:TCAS computer unit,Mode S transponder,Mode S/TCAS control panel,antennas.The TCAS interface with pilot is provided by two displays:the traffic display and the resolution advisories display.Independent of any ground inputs,TCAS performs surveillance of nearby aircraft to provide position and altitude information of these aircraft so that the collision avoidance algorithms can perform their functions.The heart of collision avoidance is the collision avoidance system logic,or the CAS logic.In this paper,the operation of the CAS logic and the basic CAS concepts such as sensitivity level,TAU and protected volume are introduced and analyzed.
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