1. Computer science and airplanes- Traffic Collision Avoidance System (TCAS) Yixin Zeng

2. First civil air Collison aviation tragedy cause >100 death • Grand Canyon mid-air collision in 1956.

3. The 1956 Grand Canyon mid-air collision A United Airlines Douglas DC-7 A Trans World Airlines Lockheed L-1049,  From:

4. First generation tcasⅠ • Theory： • Interrogates other aircraft • other aircraft reply to other interrogations • Air computer: • Calculate and notice pilot potential air collision • via airspeed, altitude, direction, promotion and demotion ratio,

5. TCASⅡ • Give RA solution • coordinate resolution before issue to commands • TA, RA, region

6. TCASⅢ & TCAsⅣ • Both concept and not implement • TCASⅢ try to generate a horizontal maneuver • TCASⅣ similar theory with ads-B

7. priority • Windshear Detection   • Ground proximity warning system (GPWS) alerts • air traffic control (ATC) instructions ---July 1, 2002 Überlingen disaster

8. Current limitations • Tcas2 only provide vertical advisories • Independence system • Lack of terrain/ground and obstacle awareness • Unit, not intuitive

9. thanks Question？