A practical RF-based indoor localization system combined with the embedded sensors in smart phone

By using the prevalent smart phone embedded with different kinds of sensors, we build a practical indoor localization system which takes low labor-cost and is large-scaly applied. In this paper we discuss the challenges in building such a system and how we handle them. Our indoor localization system is based on the radio frequency (RF) heard from the surrounding Access Points (APs). The Received Signal Strength Indicators (RSSIs) heard by APs from each other are used to build the propagation models of different environments. We propose a novel method to use the sensors embedded in smart phone to amend the locating result of a RF-based system, and successfully decrease the discrepancy of original result. The accuracy of our system reaches 70% within 2m and 95% within 3m, which can meet the needs of most indoor applications.