System and method for estimating range to an RFID tag
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United States of America Patent
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Apr 19, 2016
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app pub date -
Jun 9, 2015
filing date -
Feb 3, 2012
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Abstract
The a system for measuring distance between an RFID reader and tag, including an adaptive linear combiner, which is a tapped delay line with controllable weights on each tap, and outputs that are summed and subtracted from a reference to produce an error signal. After a sufficient number of cycles, the weight distribution indicates the delay of the received signal with respect to the reference, and by extension determines the distance between the tag and receiver.
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