System and method for estimating range to an RFID tag
US9081088B1 · kind B1 · utility
2Cited by
3References
5Claims
0Family size
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Key dates
| Filing date | Jan 29, 2013 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Jan 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/878
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.