WiTracker: An Indoor Positioning System Based on Wireless LANs

With the rapid development of wireless local area networks, indoor positioning technology based on received signal strength in wireless networks are becoming more and more attractive. In this paper, we firstly introduced the implementation of an indoor positioning system, named WiTracker. Then three improvement mechanisms, called signal strength filter, user location filter and path tracking assistance, were proposed to improve the positioning accuracy of the WiTracker system. Thirdly, we analyzed the comprehensive performance of the WiTracker system and compared it with the Radar system. Experimental results demonstrated that the proposed WiTracker system can improve the 89% accuracy in 3 meters of Radar system to 93% in a typical office building testbed. Finally, two key influence factors to positioning accuracy were further discussed and analyzed, including number of access points, and spacing between sampling points.