Patent ID: 8457923

Claim:
A velocity calculating apparatus comprising: a horizontal angular velocity detecting portion disposed to a main body portion attached to a movable object moving along a movement plane and configured to detect a horizontal axis angular velocity which is an angular velocity around a horizontal axis perpendicular to a moving direction of the movable object generated according to an inclination angle of the movement plane; a vertical acceleration detecting portion disposed to the main body portion and configured to detect a vertical acceleration which is an acceleration in the vertical direction generated according to a shape of the movement plane; a time difference calculating portion configured to calculate a time difference between a characteristic component occurring in the horizontal axis angular velocity and a characteristic component occurring in the vertical acceleration due to a predetermined position of the movement plane; and a velocity calculating portion configured to calculate a time differential velocity representing a velocity in the moving direction of the movable object based on a ratio between an installation distance from a position to which the horizontal angular velocity is estimated to be exerted in the overall movable object to an installation position of the main body portion and the time difference.