In-door wireless positioning technology

With the flourishing development and improvement of technology, the satellite-based location technique has become the well-known navigation system, the accuracy of satellite-based positioning result significantly degrades when the receiver is located in the non-line-of-sight urban area or inside the building. To overcome the problem, the widely deployed IEEE 802.11 wireless local area network (WLAN) is naturally considered as an alternative positioning solution. Unfortunately, the WLAN-based positioning technologies usually cannot derive accurate result. As a solution, this paper proposes a long-term indoor positioning solution to obtain more precise location for the applications such as invaluable equipment property monitoring, fixed wireless sensing and so on. Based on a large amount of measurement results, the proposed methodology is able to solve the issue of time-variant signal strengths. Simulation results show that the proposed method is able to control the accuracy of tens of centimeters.