Methods for noise validated phase ranging RFID location
US8159367B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2009 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Dec 3, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/84
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for validating a distance output of a phase ranging RFID location system, 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. The distance output validated by comparison with theoretical threshold data processed to generate an extreme values distribution from which a cumulative distribution function is extracted and against which a confidence level is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.