Phase ranging RFID location system
US8493182B2 · kind B2 · utility
20Cited by
7References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 16, 2009 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Sep 7, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/75
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for phase ranging the distance an RFID tag is from an RFID location system antenna along the interrogation signal beam, based upon the phase readings included in data sets obtained from monitoring reply signals corresponding to interrogation signals at multiple frequencies and a common interrogation signal beam direction; by comparison of measured phase and frequency data sets with theoretical phases calculated with respect to the same frequencies over a range of positions corresponding to a beam extent of the interrogation signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.