Fuzzy Logic Based Indoor Localization Using WLAN Infrastructure

The paper introduces a method and system for real-time positioning of mobile terminals in indoor areas. The system uses wireless LAN infrastructure (usually Wi-Fi) and evaluates signal strength from different access points. The system meets requirements and has been implemented in Java for Android-based mobile devices and successfully tested at the Centre for Assistive Technologies (CAT) at the Czech Technical University in Prague, Faculty of Electrical Engineering. The results demonstrate an average accuracy of approximately 2.5 m, which is satisfactory for determining the position of a client device at room-level (e.g. in hospitals for checking whether a patient or staff member is currently in an expected place or for deciding where they can be assigned). Its potential applications are in healthcare, disaster management, supervision of people with disabilities, etc., but also in monitoring staff and goods in closed areas.