Estimating a time offset between stationary clocks

Details Estimating a time offset between stationary clocks Estimating a time offset between stationary clocks

2011-01-04

2011-01-04

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Time duration or rate

C455S231000

Reexamination Certificate

active

07865331

ABSTRACT:
Time synchronization of two clocks is disclosed herein, such as two stationary clocks. A global time signal from a global time reference or common time source can be used to calculate a common view based clock offset between the two clocks. In parallel, a network based clock offset between the two clocks can be calculated based on messages exchanged over a communication network interconnecting the two clocks, without reverting to the global time reference. Two recent values (e.g., the two most recent values) of the common view clock offset and the network based clock offset can be combined or superposed in a seamless way to produce a final time offset estimate. The combination of independently calculated common view and network based clock offsets can be a weighted average of the two values, involving respective weights based on quality estimates of the latter. The time synchronization schemes based on a Global Positioning System (GPS) and a wide area communication network can be combined to synchronize the stationary clocks of phasor measurement units (PMUs) of a wide area monitoring system to a central server clock at a Network Control Center (NCC) of the system.

REFERENCES:
patent: 6295455 (2001-09-01), Fischer et al.
patent: 6788249 (2004-09-01), Farmer et al.
patent: 7142154 (2006-11-01), Quilter et al.
patent: 2004/0073387 (2004-04-01), Larsson et al.
patent: 1408595 (2004-04-01), None
International Search Report (PCT/ISA/210) for PCT/EP2008/057931 mailed Nov. 19, 2008.
European Search Report for EP 07113845.7 dated Feb. 4, 2008.
A. Carta et al., “A Flexible GPS-based System for Synchronized Phasor Measurement in Electric Distribution Networks”, Instrumentation and Measurement Technology Conference 2006, Sorrento, Italy, Apr. 24-27, 2006, Proceedings of the 23rd IEEE, IEEE, 2006, pp. 1547-1552 (XP-031017138).
Notification Concerning Transmittal of International Preliminary Report on Patentability (Forms PCT/IB/326 and PCT/IB/373) and the Written Opinion of the International Searching Authority (Form PCT/ISA/237) issued in corresponding International Application No. PCT/EP2008/057931 dated Feb. 18, 2010.

Affiliated with

Also associated with

Rating

Estimating a time offset between stationary clocks does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Estimating a time offset between stationary clocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimating a time offset between stationary clocks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2710535