| Work task
Management more aircraft take-off and landing and sail, in order to ensure flight order and security of the system. The air traffic control system is the main task of the: (1) to prevent the aircraft in the air crash; (2) to prevent the plane on the runway with obstacles or other moving aircraft, vehicle collision; 3. Ensure the orderly flight as planned; (4) improve the utilization rate of space flight. To accomplish these tasks, we must formulate a set of rules, which determine the number of air routes, to make the plane according to certain order from their respective airport, into the air route and maintain a certain distance between the aircraft interval, reach the finish before box off and land in a certain order. Accept control aircraft relied on visual, radio communications and navigation means execution control rules.
The development situation
The first generation of air traffic control system is formed before the second world war, mainly by the arrangement of some low-frequency station along the route. Pilots in navigation master course, rely on to keep along the route of flight time or the time interval over protection to avoid collision. This system is artificial, the ground to monitor the air. The second generation of the air traffic control system during the second world war and so on, with the beauty of radar, vor navigation system, in accordance with the navigation system and the appearance of the instrument landing system. It USES the aircraft asked to identify the secondary surveillance radar, thus can effectively monitor the flight, has greatly improve the control effect. The third generation of the air traffic control system in the 60 s, is a combination of radar, communications, and computer aided system.
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