Assistive Approach for Pedestrian Dead Reckoning Based on RSSI Using Access Point Selection Method

Since smartphones have been widely adopted by the general public and wireless fundamental infrastructure has been changed greatly, indoor positioning and location tracking methods have been applied to various kinds of service and applications. Pedestrian dead-reckoning (PDR) and a received signal strength indicator (RSSI)-based positioning method are widely used since they can be easily utilized by smartphone with build-in sensors such as accelerometer and gyroscope. However, estimation error would occur to PDR which caused by environmental interference and accumulation error in angular calculation. Moreover, RSSI measurements fluctuate according to external effects. In this paper, a novel indoor localization method based on access point (AP) selection is proposed. By assisting PDR with RSSI from stable APs, the heading angle can be updated periodically to reduce the error. Furthermore, in order to enhance the accuracy, the angle is calculated using quaternion. The experimental results show that the suitable APs selection can improve the accuracy effectively