A doppler radar is a special radar system that uses the doppler effect to function. This produces velocity data about objects at a distance. Pretty much, it beams a signal at an object and then listens for the frequency at which it returns that is altered due to the objects motion. This system can give incredibly accurate reads of where an object is and how fast its moving. Doppler radars are used in aviation,meteorology, and radiology along with many other things.
http://en.wikipedia.org/wiki/Weather_radar
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