(RADAR) is an acronym for RAdio Detection And Ranging is an object detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, and missiles. RADAR was developed in the 1930s and 1940s by several nations as a defense against enemy aircraft and missiles.
RADAR works by sending out a pulse of radio waves and then measuring the time it takes for the waves to bounce back off of an object. The returning waves are then analyzed to determine the distance, direction, or speed of the object. RADAR can be used in both active and passive modes; in active mode, RADAR transmits a signal while in passive mode radar only receives signals that are already present.
There are many different types of RADAR systems that have been developed for specific applications such as air traffic control, weather monitoring, maritime navigation, etc. Each type of RADAR system operates slightly differently but they all share common principles. As technology has progressed so too has our ability to build smaller more sophisticated RADAR systems which means they can now be found in everything from cars (Adaptive Cruise Control) to cell phones (Google Maps).
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