Vehicle e.g. car, speed measuring method, involves calculating actual speed from basic angle value, deduced from correspondence established between vehicle positions and value in calibration stage, and vehicle speed component

摘要

The method involves establishing a correspondence between each position of a vehicle (10) along a visual axis (U) and a basic angle value, in a calibration stage. The vehicle position along the axis is found. A speed component of the vehicle is measured. A value of the corresponding basic angle is deduced from the correspondence. Actual vehicle speed is calculated from the value and component, by a speed calculating module (9). The basic angle value is equal to an angle between the visual axis and the vehicle speed vector crossing the visual axis at a point corresponding to the position of the vehicle along the visual axis. An independent claim is also included for a device for measuring a speed of a vehicle moving in a predetermined path.