Definition
Ground-based or airborne electronic systems that transmit radio energy and analyze the returned signals to determine the position, distance, direction, and sometimes altitude of aircraft and weather. In air traffic control, radar systems are used by controllers to identify aircraft, monitor their movement, and provide separation, sequencing, and traffic advisories.
Plain English
Equipment that bounces radio waves off aircraft (and weather) so controllers can see where they are on a screen and keep them safely apart.
Context Anchor
Seen in instrument flying and air traffic control discussions, especially where the handbook explains how controllers maintain safe separation.
Derivation
The word 'radar' comes from RAdio Detection And Ranging — a name coined during WWII. Knowing this reminds the pilot that radar is fundamentally about detecting something and measuring its range using radio waves.
Why Pilots Care
Radar coverage lets controllers provide precise separation even when pilots cannot see other traffic, reducing collision risk in instrument conditions.
Intuition Check
Do not think of radar systems as only the screen in a control room or only weather radar in an aircraft. Here, the term means the surveillance equipment used by air traffic control to track aircraft and support safe spacing.
Example Sentence 1
Pilots flying in busy terminal airspace rely on ATC radar systems to maintain separation from other traffic.
Example Sentence 2
Pilots flying in busy airspace depend on radar systems to receive timely traffic advisories from approach control.