Joseph Walsh and John Wojciech

Peer Reviewed

Abstract: The Trafiic Alert and Collision Avoidance System (TCAS) is the culmination of over 30 years of work by the aviation community to develop an airborne collision avoidance system that will complement the FAA’s ground-based air traffic control (ATC) system. Use of the existing ATC radar transponders provides the basis for TCAS. A collision avoidance system based on ATC transponders has the advantage that it can provide immediate, highquality protection against the large population of aircraft already transponder-equipped. The airborne TCAS uses transponder information to track nearby aircraft. This tracking data is used to develop and display in the cockpit advisory information that advises the pilot in maneuvering to avoid threat aircraft. This paper describes the design, operation, and application of the three versions of TCAS (TCAS I, II, and III), and continuing development and implementation of TCAS during the 1990s. TCAS II is stressed since it is already in use by U.S. airlines.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 38, Number 4
Pages: 383 - 398
Cite this article: Walsh, Joseph, Wojciech, John, "TCAS IN THE 1990s", NAVIGATION: Journal of The Institute of Navigation, Vol. 38, No. 4, Winter 1991-1992, pp. 383-398.
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