Phase-Based UHF RFID Tracking With Nonlinear Kalman Filtering and Smoothing
Phase-Based UHF RFID Tracking With Nonlinear Kalman Filtering and Smoothing
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DOI:
10.1109/jsen.2011.2164062
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发表时间:
2012-05
影响因子:
4.3
通讯作者:
Simo Särkkä;Ville Viikari;Miika Huusko;K. Jaakkola
中科院分区:
文献类型:
--
作者:
Simo Särkkä;Ville Viikari;Miika Huusko;K. Jaakkola
In this paper, we present an UHF RFID location tracking system, which is based on measuring the phases of back scattered signals from RFID tag using multiple spatially distributed antennas at a single carrier frequency. The wavelength ambiguity of the phase measurements is resolved by using the extended Kalman filter (EKF) and the Rauch-Tung-Striebel (RTS) smoother, where the state includes the position, velocity and the phase offsets of antennas. The performance of the method is experimentally verified at 890 MHz using a commercially available RFID reader.