How do microwave radar speed sensors work?
(A)Microwave radars use the Doppler principle to measure speed. Doppler radar uses the fact the return echo from a moving target (vehicles, baseballs, hockey pucks, golf balls, etc.) is frequency shifted (off the transmit frequency) proportional to the target speed. The greater the target speed, the greater the frequency shift (change) also referred to as the Doppler shift.
