Passive UHF far-field RFID based localization in smart rack

Many companies face issues today in locating their assets and inventories in storage racks. In this study, we explored the use of passive UHF RFID for locating relative positions of items on storage racks. The storage rack with UHF RFID localization function is named as smart rack in this study. This paper addresses the technical issue of how to make use of the reference RFID tag signals to improve the accuracy of the position estimation of the target RFID tag. A passive UHF RFID smart rack test bed was built to quantify the UHF RFID signals variance in the test bed. The signals are analyzed for the development of next generation RFID system for smart rack applications.