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Radar is an abbreviation for radio detection and ranging. The technology behind the radar was vigorously progressed during the World War II and played an important role in the outcome of the war.

It uses electromagnetic waves of wavelengths from the centimeter to the decimeter.

To measure the distance of an object you take the time it takes between sending out the wave and receiving the repulse.

To measure the speed of an object you use the Doppler effect.

Specific radar systems

See also: sonar