Doppler effect thumb|upright=1.5|The emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h). This is only a component of the real speed (170 km/h).
doppler effect thumb|upright=15|the emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h) this is only a component of the real speed (170 km/h)