System and method for detecting intervehicle distance of two veh

Details System and method for detecting intervehicle distance of two veh System and method for detecting intervehicle distance of two veh

1985-07-12

1988-11-22

Paschall, M. H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356141, 180168, 180169, G01C 308

Patent

active

047861649

ABSTRACT:
The system and method for detecting an intervehicle distance to a preceding vehicle which is moving on the same lane as the vehicle, means for radiating and sweeping an electromagnetic wave such as a laser beam toward the moving direction of the vehicle is provided, with the confirmation of a lane on which the vehicle moves on the basis of a comparison of their sweep angles to reflectors located on both ends of a road on which the vehicle moves from a center axis of the vehicle's movement direction, the traffic lane on which a vehicle moving in front of the vehicle moves is determined on the basis of their sweep angles of the electromagnetic wave with respect to the vehicle from the other vehicle moving in front of the vehicle to the reflectors located on both ends of the road and having the same distance to the vehicle as the other vehicle, and the intervehicle distance data is outputted upon determination that both vehicles move on the same traffic lane, a correct intervehicle distance from the vehicle to the preceding vehicle can thus be measured. In addition, the center axis is corrected according to a steering angle of the vehicle's steering wheel.

REFERENCES:
patent: 3661459 (1972-05-01), Aoki
patent: 4477184 (1984-10-01), Endo
patent: 4621705 (1986-11-01), Etoh
patent: 4632543 (1986-12-01), Endo
patent: 4634272 (1987-01-01), Endo
patent: 4670845 (1987-06-01), Etoh

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