Graph-Based Indoor Localization with the Fusion of PDR and RFID Technologies.

A text map based indoor localization is proposed with the fusion of radio frequency identification (RFID) and inertial measurement unit (IMU) in the narrow corridor space. The floor plan in narrow corridor is abstracted to a text map which uses the form of characters to represent indoor physical map. Then the indoor localization would be changed in the process of text processing and matching. When tag carrier is walking in the positioning area, the character string would be constructed with pedestrian dead reckoning (PDR) technology according to the path information. We search the character string in the text map and get the corresponding candidate locations, and then received signal strength (RSS) based fingerprint matching method is used to obtain the accurate location from candidate locations. The experiment is conducted to show that proposed method can reduce the mean positioning error to around 1.2 m without initial location specification.