RADAR is an object detection system that uses electromagnetic waves to recognize the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, motor vehicles, weather formations, and terrain. Radar was originally called RDF , now used as different device in the United Kingdom.
RADAR system has a transmitter to emit the microwaves or radio waves. These waves are in phase when emitted, and when they inherit contact with an object are scattered in all directions. Thus the signal partly reflected back and it has a slight change in wavelength if the target is moving.
The receiver is generally, but not always, in the same location as the transmitter. Although the signal returned is usually very weak, the signal can be amplified through use of electronic techniques in the receiver and in the antenna arrangement. This enables radar to detect objects at range where further emissions, such as sound or visible light, would be too weak to detect. RADAR is used in meteorological detection of rainfall, measuring ocean surface waves, air traffic control, police detection of speeding traffic, and by the military.
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