- Radar is a device that uses reflected radio waves to detect the position or movement of a person or thing.
An example of radar is the device highway patrol officers use to detect people who are driving too fast.
A policeman using a radar gun.
radar definition by Webster's New World
Origin: ra(dio) d(etecting) a(nd) r(anging)
radar definition by American Heritage Dictionary
- A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency radio waves reflected from their surfaces.
- The equipment used in such detection.
Origin: ra(dio) d(etecting) a(nd) r(anging).
radar - Computer Definition
A microwave radio technology that uses reflected energy to detect and determine the direction of and distance to remote objects. Multiple return signals can be correlated over time to determine the velocity and direction of moving objects. Applications include navigation, targeting, and tracking for civilian and military purposes. See also microwave, radio, and sonar.
radar - Cultural Definition
radar - Science Definition
- A method of detecting distant objects and determining their position, speed, material composition, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves. The waves can be converted into images, as for use on weather maps.
- The equipment used in such detecting. See also Doppler effect, lidar, sonar.
A radio antenna sends out a stream of radio waves (light gray). When they reach the airplane, they bounce off of it and send reflected waves (dark gray) back to a receiver in the antenna. The reflected waves are then processed electronically and analyzed to determine the airplane's distance, speed, and position. An image of the airplane is sometimes also generated.