Doppler+nathan

Doppler Radar is used to detect weather and more specifically tornadoes. It uses the doppler affect to measure velocity of whichever object you are looking for. It sends pulses of beams which are reflected back to the reciever. It allows for the recieval of radial velocities.

Doppler radar, this time used by cops to detect those pesky speeders (TRENT), works by sending electromagnetic waves set to a precise frequency, and then sent towards the object you are looking for. When the electromagnetic radiation wave hits the moving object, it bounces back towards the reciever (COP) and then he reads that TRENT was going 123 miles over the speed limit.