Angle of position object location system and method

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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C340S870030, C342S042000

Reexamination Certificate

active

10931476

ABSTRACT:
An object location system and method is provided for locating objects. The system includes an RFID reader, an angle calculator, and a distance calculator to determine which of a plurality of zones an object is located in or passing through. An RFID tag is affixed with the object that is to be located. The RFID reader transmits signals to the RFID tag and receives backscatter-modulated signals from the RFID tag at one or more RFID antennas. From those received signals, the angle calculator determines an angle of position of the RFID tag relative to the RFID antenna. From the angle of position the zone in which the object is located is determined.

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Partial International Search PCT/US2005/030580 Apr. 24, 2006.

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