Patent ID: 6813582
Filing Date: 2004-11-02
Classification: G01C,G06K

Abstract:
A device comprising:one or more acceleration measuring transducers to be positioned around a user's torso to detect the user's movement in one or more axes, at least one of the acceleration measuring transducers to provide an output signal corresponding to motion along one axis; an altimeter to detect changes in altitude and provide a corresponding output signal; and a processing unit communicatively coupled to the plurality of acceleration measuring transducers and the altimeter, the processing unit to receive one or more signals from the one or more acceleration measuring transducers and the altimeter and generate navigation information, wherein the processing unit is configured to determine the slope of motion by determining a number of steps taken by the user, determining a horizontal distance traveled by multiplying the number of steps by a nominal stride length, determining a change in elevation from the altimeter signal, and dividing the change in elevation by the horizontal distance traveled.