2428817-A1 is referenced by 3 patents and cites 2 patents.

Techniques for tracking the motion of an RFID tag using signal strength information. A single antenna (104) of an RFID reader (102) may be used to take a sequence of readings from an RFID tag (110) in motion. A signal strength indicator (e.g., received signal strength indicator (RSSI)) is determined for each reading. The sequence of RSSIs is then used to estimate a path of motion of the RFID tag (110) and the direction of motion of the RFID tag (110) along the path.

Title
Motion tracking techniques for RFID tags
Bewegungsverfolgungstechniken für RFID-Etiketten
Techniques de suivi de mouvement pour étiquettes RFID
Application Number
EP20110180618 20110908
Publication Number
2428817 (A1)
Application Date
September 8, 2011
Publication Date
March 14, 2012
Inventor
HULL JONATHAN J
US
LIU XU
US
Assignee
RICOH
JP
IPC
G01S 05/02
G01S 11/06
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