DISTANCE-MEASURING APPARATUS

摘要

PROBLEM TO BE SOLVED: To accurately measure a distance even if pitching has occurred by substantially correcting upper and lower positions of a window with a window position correcting means in response to the detection of changes in the pitching surpassing a set value made by a pitching change detecting means. SOLUTION: A relative speed and a relative acceleration or deceleration speed of an object 4 to an object 4 is determined by a relative momentum computing means 12 of a pitching change detecting means 11 based on a distance data obtained by a distance computing means 9. A pitching judging means 13 determines that a change in the pitching has occurred when the relative speed and the relative acceleration or deceleration speed obtained by the relative momentum computing means 12 exceeds a specified value. A window position correcting means 15 computes a correction value S by a formula of S=G×An using counts G and the relative acceleration or deceleration speed An . The subsequent window position determined by a window determining means 7 is corrected by the correction value S stored in a position correction memory means 16. This allows upward or downward correction of the position of the window to prevent errors attributed to the generation of the pitching which causes inclusion of a road surface character in the window or the like.