Patent ID: 8990046
Filing Date: 2015-03-24
Classification: G01C,G06F

Abstract:
1. A portable terminal comprising: an accelerometer embedded in the portable terminal configured to detect acceleration due to a movement of the portable terminal as a pedestrian carrying the portable terminal walks; a gyroscope embedded in the portable terminal configured to detect angular velocity due to the movement of the portable terminal as the pedestrian carrying the portable terminal walks; and a controller configured to determine a magnitude of a swinging motion of the portable terminal by using at least one of the detected acceleration and angular velocity, determine that the portable terminal makes the swinging motion if the magnitude of the swinging motion is equal to or greater than a predetermined value, determine a carrying position of the portable terminal in or on the pedestrian's body by using at least one of the detected acceleration and angular velocity, and estimate a step length of the pedestrian according to the determined carrying position of the portable terminal.