Portable position detector for pedestrian navigation has positioning system based on pedometer, terrestrial magnetic field detector and accelerometer

摘要

The distance covered is calculated from the number of steps times the length of a step. The length of a step is corrected using the accelerometer (23). The direction of movement is determined using the terrestrial magnetic field detector (13). Thus the position of a pedestrian can be estimated based on the distance and direction. The position detector may include a GPS unit for measuring the current position and correcting the estimated position when GPS information is available. An Independent claim is given for a position management system.