Distance determination between RFID tags
US9767330B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 2015 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Sep 27, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10237
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Technologies are generally described for distance determination between two or more RFID tags based on a minimum detectable signal. In some examples, a first RFID tag may establish communication with a second RFID tag, and modulate an irradiating electromagnetic field to generate backscatter signals for sequential transmission to the second RFID tag. A depth of amplitude modulation of each transmitted signal may be progressively reduced until the second RFID tag can no longer detect the modulation. The particular distance between the first and second RFID tags may then be determined based on a minimum detectable signal by the second RFID tag, which may be identified as a last transmitted signal detected by the second RFID tag. In some embodiments, distance determination between two or more RFID tags as described above may be implemented for robotic sensing, assembly systems, security, and wearable technology to track motion and/or position of objects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.