This paper describes a new method of measuring user's position for location-based services in wide indoor environments. Conventional localization methods usually employ a hybrid approach in which user's position is estimated by combining positioning infrastructures and a pedometer. Since the installation cost of infrastructures increases when the area expands, the measurement of user's relative position with high accuracy is required. This paper proposes a new localization method for a walking or running user by measuring user's orientation and geometrical relationship between user's heel and waist with an orientation sensor and an electromagnetic tracker that are attached to user's body. Experiments have been carried out using a prototype system to evaluate the accuracy of user localization with the proposed method
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