Doppler radar is a radar that makes use of the doppler effect to produce data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection, then analyzing how the original signal has been altered by the object(s) that reflected it. Doppler radars are used in air defense, air traffic control, sounding satellites, etc. This doppler radar map was take on November 23, 2009.
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