Principles and Techniques of RFID Positioning

Radio frequency identification (RFID) systems, which basically consist of readers and tags, were originally developed for the identification of tagged objects, as the name RFID implies. Recently, precise positioning and tracking of RFID tags or readers has received considerable attention from both academia and industry. For example, finding the position of RFID tags is an important task in various real-time locating systems (RTLS) to locate and track products, assets, and personnel with attached RFID tags in an area covered by the RFID readers Con08, Amir09)). In other applications, it is desirable for a reader to identify its own position with the assistance of reference tags SMI08)). Numerous RFID localization products have been developed for various applications. RFID positioning techniques and applications have been surveyed in (Mill06, BMG07, BS08, ZS08, SK08).