In recent years, technological advances have made the Doppler effect an enabling enhancement for many sensing systems. Optical and RF Doppler to measure spacecraft speed and even astronomical bodies such as stars and galaxies (often referred to as red shift for those receding and blue shift for those approaching). ![]() RF Doppler in radar to judge vehicles, ships, aircraft, and even spacecraft.Optical Doppler to determine speed of autonomous cars.Ultrasonic and RF radar Doppler to sense motion of people in an area. ![]()
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