Multi-protocol RFID system using bit-lock or step-lock synchronization
US8314687B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2011 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Oct 14, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B15/063
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGO™ RFID backscatter transponders, SEGO™ RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.