Method and apparatus for automatically dimming motor vehicle hea

Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Device actuated by presence of land vehicle

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G01S 1352

Patent

active

054304504

ABSTRACT:
The intensity of the headlights of a motor vehicle are modulated in response to pulsed Doppler radar signals which are used to distinguish between moving vehicles and other objects. The radar signals scan an area generally in front of the host vehicle. Reflected radar signals are received and radar return signals representative thereof are generated. A time to frequency domain transform, preferably a fast Fourier transform, is performed on the radar return signals to produce radar frequency signals. An adaptive technique is used to identify portions of the radar frequency signals produced by reflections from significant objects. The Doppler effect is used to determine the velocity of detected objects to the host vehicle. Any difference between the relative velocity of a detected object and the velocity of the host vehicle indicates that the object is moving. The velocity of the host vehicle may be determined by a conventional speed sensor or by means of radar signals reflected from a stationary object. Distance between the vehicle and a moving object is determined from the travel time of radar signals reflected from the moving object. The headlights of the host vehicle are modulated when a moving object is a predetermined distance from the host vehicle.

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