Radio frequency identification tag location estimation and...

Communications: electrical – Selective – Interrogation response

Reexamination Certificate

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C340S010300, C340S572100, C340S539220, C342S463000, C342S450000, C343S757000

Reexamination Certificate

active

08072311

ABSTRACT:
Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.

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International Search Report for International Application No. PCT/US2009/040584, date completed Jan. 7, 2010, date mailed Jan. 26, 2010, 4 pgs.
Written Opinion of the International Searching Authority for International Application No. PCT/US2009/040584, date completed Jan. 7, 2010, date mailed Jan. 26, 2010, 5 pgs.

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