Patent ID: 6230097
Filing Date: 2001-05-08
Classification: G01C,G08G

Abstract:
A method for vehicle navigation on a selected lane on a vehicle path, the method comprising the steps of:obtaining coordinates for a boundary line segment that helps define said selected lane on a selected path on which a vehicle travels;receiving location determination (LD) signals and LD correction signals that allow estimation and correction of the present location of the vehicle, relative to the selected lane, with an inaccuracy that is no more than about 50 cm, where the LD correction signals are provided by at least three spaced apart LD correction signal sources, with at least two of the LD correction signals being produced by LD correction signal sources that are at least a selected distance d from the vehicle, where d is at least 50 km, said step of receiving location determination (LD) signals and LD correction signals further comprisingreceiving said LD correction signals as part of a composite signal that also contains at least one signal that is unrelated to said LD correction signals and to said LD signals; andseparating said LD correction signals from the at least one signal that is unrelated to said LD correction signals and to said LD signals; anddetermining and displaying, in at least one of graphical form and alphanumeric form, the present location of the vehicle relative to the boundary line segment.