System and method for wireless communications
US9848252B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2012 |
| Grant date | Dec 19, 2017 |
| Priority date | — |
| Expiry date | May 13, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2209/84
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and system for estimating position of a moving RFID tag is provided. The method includes transmitting at least one interrogator signal; receiving, at an interrogator antenna, a reflected signal from the RFID tag; determining phase changes of the reflected signal with respect to the phase of the at least one interrogator signal; weighting the phase changes based on instant power corresponding to the phase changes; producing a phase trajectory for the reflected signal based on the weighted phase changes; and estimating position of the RFID tag relative to the interrogator antenna based on the peak of the phase trajectory for the reflected signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.