Calibration of a Navigation System

摘要

A method and apparatus for correcting position error in a navigation system. A first set of positioning measurements of a device are determined from signals received from a first plurality of sources and a second set of positioning measurements of the device are determined from signals received from a second plurality of sources. A database comprising map-related information of a predetermined region is provided and a location of the device as a function of the first and second set of positioning measurements and selected map-related information is estimated. Errors in future estimated locations in a navigational system may be compensated by determining a divergence of the second set from the first set of positioning measurements. A navigational system that refines its accuracy over time is demonstrated whereby current estimates of location may be improved and data mapping utilized for future location estimates may be updated.