Patent ID: 8432253
Filing Date: 2013-04-30
Classification: G01S,H04Q

Abstract:
1. A computer implemented method for combining RFID tag signal strength computations with factors that incorporate physical realities to determine a tag's real-time location, comprising the steps of: evaluating a tag read list comprised of reader reception of signals emitted by said tag, said evaluating step including the steps of checking for locations in which no read is made indicative of physical obstructions and for locations in which there are spikes in tag signal strength indicative of spurious signal strength; evaluating nearest tag reader probabilities, including the steps of evaluating confidence factors, demoting unlikely nearest readers, and identifying contenders based on the evaluated locations of no read and locations of spikes and likelihood of traversal of the tag from a previous reader location to the current reader location based on said physical realities; selecting a closest reader based on the evaluated nearest tag reader probabilities; and identifying a zone within which said tag is located based on said selected closest reader.