Trents+da+doppler+ding

Doppler radar is used by police radars to determine the speed a vehicle is traveling at. The gun sends out electromagnetic radiation at a precise frequency that is then reflected off the vehicle and returns back at a different frequency. The returning frequency thus determines the speed the vehicle was moving at. The shorter the frequency, teh faster the vehicle is moving.

Pulse-doppler radar is used to determine weather patterns. It is what gives you the video of the weather patterns. Instead of sending out a constant beam like the radar gun, it sends it out in pulses. The shift the pulses take allow us to determine the weather. For instance, if a measurement causes the phase of the pulse to shift by 400 degrees. Mathematically, this is identical to a shift of 40 degrees.