System and method for positioning active RFID tag
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United States of America Patent
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Dec 25, 2012
Grant Date -
Jul 1, 2010
app pub date -
Dec 31, 2008
filing date -
Dec 31, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A positioning system and method are provided to use multiple RFID readers to position a target object with an active RFID tag equipped thereon. The system and method defines a geometric center of the locations of the RFID readers as a first coordinate. When the RFID readers continuously receive RF signals of the active RFID tag, a corresponding signal intensity of each of the RF signals is calculated and compared to obtain an approaching vector corresponding to the location of the RFID reader with the greatest signal intensity of the RF signal. A positioned location of the target object is then approached from the first coordinate to a second coordinate according to the approaching vector. The first coordinate and the positioned location of the target object will be reset as the second coordinate. The reset first coordinate is output as the latest positioned location of the target object.
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