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1. (WO2018183571) METHODS AND APPARATUS FOR LOCATING RFID TAGS

Pub. No.:    WO/2018/183571    International Application No.:    PCT/US2018/024950
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Thu Mar 29 01:59:59 CEST 2018
IPC: G01S 5/02
Applicants: AUTOMATON, INC.
Inventors: HEWETT, Spencer
BLAIR, Adam
SEIFF, Ken
MURPHY, Michael
WIEMAN, Mark
ADLIN, Tamara
Title: METHODS AND APPARATUS FOR LOCATING RFID TAGS
Abstract:
A radio frequency identification (RFID) system includes an array of antennas to distinguish line-of-sight (LOS) paths from non-line-of-sight (NLOS) paths. The distance between adjacent antennas in the array of antennas is less than half the wavelength of the radio frequency (RF) signal of the system. Each antenna in the antenna array is also digitally controlled to change relative phase difference among the antennas, thereby allowing digital steering of the array of antennas across angles of arrival (AOAs) between 0 and π. The digital steering generates a plot of signal amplitudes as a function of AOAs. LOS paths are distinguished from NLOS paths based on the shapes (e.g., depth, gradient, etc.) of local extremes (e.g., maxima or minima) in the plot.