System and method for estimating range to an RFID tag
US10302756B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | Dec 11, 2017 |
| Grant date | May 28, 2019 |
| Priority date | — |
| Expiry date | Dec 11, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/878
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system is described for measuring distance between an RFID reader and an RFID backscatter 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.