Patent ID: 7289898
Filing Date: 2007-10-30
Classification: B60W,G01C,G01P

Abstract:
1. An apparatus for measuring the speed of a moving object using a Dead Reckoning (DR) system connected to the object, the apparatus comprising: accelerometers for measuring a first acceleration along a moving direction of the moving object and a second acceleration along a lateral direction of the moving object; gyroscopes for measuring a first angular speed along the lateral direction of the moving object and a second angular speed along a lower direction of the moving object; a roll angle calculator for calculating a roll angle of the moving object using the second acceleration, the second angular speed, a previous speed of the moving object in the moving direction of the moving object, and a previous road inclination angle with respect to the moving direction of the moving object; an inclination angle calculator for calculating a road inclination angle using the calculated roll angle, the first angular speed, and the second angular speed; and a speed calculator for calculating a pure motion acceleration in the moving direction of the moving object using the calculated road inclination angle and for calculating the speed of the moving object using the pure motion acceleration of the moving object.