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An air surveillance radar covers within an area of a certain size around the radar, and must listen for echo signals
An air surveillance radar covers within an area of a certain size around the radar, and must listen for echo signals. Its antenna pattern is adjusted for the specific task. Mostly the antenna forms a rotating fan beam or cosecant squared antenna pattern. This form of volume scan is then called 2D radar. Such radar can measure only two coordinates to determine the position of aims.
it's a RADAR who can used in one direction ( surface or air ) .. the latest radar's are 3D ( surface & air & angle of the target )
