What Are Radars?

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A radar is a radio device used to detect the position of distant objects, both moving and fixed, using electromagnetic waves, specifically radio waves. It identifies the range, altitude, direction and speed of objects such as aircrafts, ships, spacecrafts, mountain ranges, radio and TV towers, guided missiles and motor vehicles. The radar antenna or dish transmits pulses of radio waves, which bounce off any object in their path and return to the antenna or dish, which is usually located at the same site as the transmitter. The term 'radar' was coined in 1940 by electronics engineers working for the US Navy as an acronym for Radio Detection and Ranging.