FIELD: physics.
SUBSTANCE: device includes: a light projector (11) configured to project a patterned light beam onto the road surface around the vehicle; an image capturing unit (12) configured to capture an image of an area, on which the light beam formed on the pattern is projected; a module (21) for extracting the patterned light beam, configured to extract the position of the light pattern generated from the pattern from the pattern; an orientation angle calculating unit (22) configured to calculate the vehicle orientation angle with respect to the road surface from the patterned light beam position; an orientation change value calculating unit (24) configured to calculate a change amount of the vehicle orientation based on temporal changes of several characteristic points on the road surface in the image; and an own position calculating unit (26) configured to calculate the current position and the current vehicle orientation angle by summing the amount of the orientation change with the starting position and the initial orientation angle of the vehicle. If the detected condition of the patterned light beam is equal to or higher than the threshold value, the patterned light beam extracting module (21) extracts the position of the patterned light from the superimposed image by superimposing the images in the frames obtained with the image capturing unit (12).
EFFECT: accurate detection of a light beam projected onto a pattern, projected onto the road surface, and accurate calculation of the vehicle own position.
5 cl, 21 dwg
