One distinguishes several types of radars used for the air control civil.

primary education radars

These radars follow the traditional principle of detection.

There first of all exist the primary education radars of approach, established in the airports. The purpose of they are to detect all the aircraft approaching an airport, in particular those which would not be equipped with Transpondeur S which would thus not be detectable by a secondary radar. The introduction of the compression of impulses allowed large savings in operation, and thus the perenniality of the use of these radars.

Then, radars on the way, charged to detect the planes in transit above a territory. They do not exist any more in France and Europe. Indeed, these radars being large-scale consumers of power and heavy to implement, they were supplanted for the monitoring by the secondary radars, much more effective.

Lastly, radars of ground, charged to provide to the air-traffic controller an image of all the vehicles, planes or cars, circulating on the tarmac of an airport, in order to be able to ensure a good circulation on this one.

secondary radars

One distinguishes two types of secondary radars.

The traditional secondary Radar, used to question the planes on their positions.

The secondary radars mode S, evolution allowing the identification without ambiguity of the planes, as well as a true exchange of information enters a radar and a plane, making it possible to transmit to the plane all kinds of information.

Continuation for air control

The Radar S, which they are primary or secondary, locate the planes and locate them in a space way. One calls these traces, of the studs or comets. From these traces, one can manufacture an image radar used by an air-traffic controller. The various radars distributed on a territory have a range and a range operating which overlap, and so they manufacture each one a stud for the same plane. So that an image is not saturated with redundant studs, the radars send their information to a calculator charged to amalgamate these studs. One obtains an image then where the planes are reference mark by several radars, and thus rather reliable as for posted information.

See detailed article: Control system automated of the air traffic

External bonds

The site of the Management of the Technique and the Innovation of the French civil aviation makes a good summary of the techniques radars: Civil aviation

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