The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2011
Filed:
Dec. 27, 2005
Kwang-ho Ko, Daejeon, KR;
Chang-sub Shin, Daejeon, KR;
Hyun Lee, Daejeon, KR;
Won-chul Choi, Chungbuk, KR;
Woo-yong Lee, Daejeon, KR;
Choon-sik Yim, Daejeon, KR;
Cheol-sig Pyo, Daejeon, KR;
Jong-suk Chae, Daejeon, KR;
Kwang-Ho Ko, Daejeon, KR;
Chang-Sub Shin, Daejeon, KR;
Hyun Lee, Daejeon, KR;
Won-Chul Choi, Chungbuk, KR;
Woo-Yong Lee, Daejeon, KR;
Choon-Sik Yim, Daejeon, KR;
Cheol-Sig Pyo, Daejeon, KR;
Jong-Suk Chae, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
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.