Patent ID: 8742896
Filing Date: 2014-06-03
Classification: G01S,G06K,G08B,H01Q

Abstract:
1. A method of locating and tracking an RFID tag, the steps comprising: calibrating at least two phase array steerable antennas to optimally align the antennas with known global coordinates; configuring an RFID reader for a working environment; performing a two-dimensional raster scan of a visible area of the working environment with a first antenna; calculating a minimal covering of the visible area with one or more beam areas; defining a set of steering directions for raster scans; using the first antenna to determine if one or more RFID tags are present in the beam areas; estimating an expected location for at least one RFID tag in the beam area; projecting the expected location of the RFID tag into global coordinates; estimating the most probable conjugate pairing (“PGPt calculating a most likely location of the RFID tag's projection in global coordinates relative to a second antenna (“PGPt calculating a projection in global coordinates inverse of PGPt reading with the other antenna in the direction indicated by a plane point projection of PGPt triangulating any RFID tag seen by the other antenna using PGPt triangulating using PGPt