Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.see the video..below is the mathematical definition for radar working..
As the radar antenna turns, it emits extremely short bursts of radio waves, called pulses. Each pulse lasts about 0.00000157 seconds (1.57x10-6), with a 0.00099843-second (998.43x10-6) "listening period" in between. The transmitted radio waves move through the atmosphere at about the speed of light.
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