Phase based spatial identification of UHF RFID tags

Pavel V. Nikitin, Rene Martinez, Shashi Ramamurthy, Hunter Leland, Gary Spiess, K. V. S. Rao
2010 2010 IEEE International Conference on RFID (IEEE RFID 2010)  
In this paper, we give an overview of spatial identification (determining position and velocity) of modulated backscatter UHF RFID tags using RF phase information. We describe three main techniques based on PDOA (Phase Difference of Arrival): TD (Time Domain), FD (Frequency Domain), and SD (Spatial Domain). The techniques are illustrated with modeling and simulation example in free space and in presence of multipath using a multi-ray channel model for amplitude and phase of the received tag
more » ... he received tag signal in deterministic environment. We also present and discuss the experiments performed in a real RFID warehouse portal environment. I.
doi:10.1109/rfid.2010.5467253 fatcat:q5aumgikhvfe7ldw4ljw7xd7de