Aircraft Traffic Management - Research Article from Macmillan Science Library: Computer Sciences

This encyclopedia article consists of approximately 5 pages of information about Aircraft Traffic Management.
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Primary and Secondary Radar

With the advent of radar, aircraft could be located from the ground even in clouds, and accurate position reports were not required from the aircraft. The required amount of separation was reduced significantly and the airport was used at a higher capacity. However, radar alone was not enough to ensure flight safety. The controller saw only anonymous green "blips" on the radar screen, denoting the aircraft. Secondly, the radar screen, which is called a plan position indicator, or PPI, is a two-dimensional display and aircraft are flying in a three-dimensional world. In order to control planes more accurately, a way was needed to identify the blips and to show their altitude. The system used is called a "secondary radar" system, a communications system that operates in concert with the radar.

With these two tools, primary and secondary radar, air traffic controllers could monitor...

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This section contains 1,211 words
(approx. 5 pages at 300 words per page)
Buy the Aircraft Traffic Management Encyclopedia Article
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Macmillan Science Library: Computer Sciences
Aircraft Traffic Management from Macmillan Science Library: Computer Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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