Apparatus for synchronizing clock in real-time locating system and method therefor
US8005369B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2005 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Mar 19, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0667
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A highly precise clock synchronization apparatus in a real-time locating system (RTLS), includes an optical transmitting/receiving unit for receiving a clock information frame from a clock synchronization server, converting the received clock information frame in series-parallel, and transmitting/receiving the clock information data and the clock information; an offset estimation unit for detecting a preamble signal and a clock information signal from the series-parallel converted clock information frame, calculating a phase difference value by comparing the detected preamble signal with the detected clock information signal, and outputting an offset value based on the calculated phase difference value; and a clock synchronization unit for updating a local clock value to a time of the clock synchronization server based on the offset value and the clock information frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.