Importance

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Abstract

A system and method for controlling a vehicle speed to follow a preceding vehicle moving on the same traffic lane of a road as the vehicle. The system comprises: means for transmitting electromagnetic waves toward a vehicle movement direction, receiving the reflected waves from a reflecting object, measuring a distance to the reflecting object on the basis of a propagation delay time on the transmitted and reflected wave, and outputting respective Doppler signals derived from a relative movement of the reflecting object to the vehicle; means for calculating a change rate of the phase difference between the Doppler signals with respect to the measured distance; means for determining whether the reflecting object is the preceding vehicle on the basis of a magnitude of the differentiated phase difference with respect to a reference value associated with the distance and set according a radius of curvature of the traffic lane on which the vehicle moves; and means for controlling the vehicle speed so as to follow the preceding vehicle at a safe intervehicle distance on the basis of the vehicle speed and measured distance.

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First Claim