DETERMINING THE POSITION OF A MOBILE DEVICE IN A GEOGRAPHICAL AREA

摘要

A mobile device has sensors providing acceleration and orientation information. These are processed to provide trajectory for the device. The processing includes improved methods of classifying the motion and detecting a user's steps as they carry the device, tracking the orientation and acceleration of the device, estimating the length of the user's steps and estimating the heading of the user. The trajectories are compared to a map and corrected by the constraints provided by the map. Parameters of the methods of producing the trajectories are optimised on the basis of maximising probability of the trajectory found by the map matching given the indicated trajectory.