System integration of an IEEE 802.11 based TDoA localization system

Network entities with synchronized clocks are an enabler for many interesting and innovative applications. Localization of mobile WLAN devices by means of propagation delay measurements and position calculation according to time difference of arrival (TDoA) method is one of the most interesting applications. Those localization techniques are favored over standard signal strength based methods when high accuracy positioning is desired. This paper presents a system that utilizes special synchronized receivers in conjunction with a central unit to locate WLAN devices. The system architecture is described in terms of the integration of all participating entities for both, hardware and software. 1