TY - GEN
T1 - A Kalman filter approach to clock synchronization of cascaded network elements
AU - Na, Chongning
AU - Scheiterer, Ruxandra Lupas
AU - Obradovic, Dragan
AU - Nossek, Josef A.
PY - 2009
Y1 - 2009
N2 - The Precision Time Protocol specified by IEEE 1588 standard has been proved to be an appropriate network synchronization protocol. The PTP protocol is based on exchanging appropriate timing information, generated by time stamping according to the local clocks, between adjacent clocks. Using the time-stamps, a slave element learns the relation between its own clock and the master clock so that it can synchronize its time to the reference time provided by the master. Uncertainties, e.g., random stamping and quantization errors, greatly affect the synchronization precision. This paper presents a probabilistic state-space model which quantifies the uncertainties and represents the relation between the system variables. Then clock synchronization is posed as a state estimation problem and solved by using Kalman filter. The performance of this approach is verified by numerical results.
AB - The Precision Time Protocol specified by IEEE 1588 standard has been proved to be an appropriate network synchronization protocol. The PTP protocol is based on exchanging appropriate timing information, generated by time stamping according to the local clocks, between adjacent clocks. Using the time-stamps, a slave element learns the relation between its own clock and the master clock so that it can synchronize its time to the reference time provided by the master. Uncertainties, e.g., random stamping and quantization errors, greatly affect the synchronization precision. This paper presents a probabilistic state-space model which quantifies the uncertainties and represents the relation between the system variables. Then clock synchronization is posed as a state estimation problem and solved by using Kalman filter. The performance of this approach is verified by numerical results.
KW - Kalman filter
KW - Precision Time Protocol
KW - State-space model
KW - Synchronization
UR - http://www.scopus.com/inward/record.url?scp=79960951665&partnerID=8YFLogxK
U2 - 10.3182/20090924-3-IT-4005.0047
DO - 10.3182/20090924-3-IT-4005.0047
M3 - Conference contribution
AN - SCOPUS:79960951665
SN - 9783902661524
T3 - IFAC Proceedings Volumes (IFAC-PapersOnline)
SP - 54
EP - 59
BT - 1st IFAC Workshop on Estimation and Control of Networked Systems, NecSys'09
T2 - 1st IFAC Workshop on Estimation and Control of Networked Systems, NecSys'09
Y2 - 24 September 2009 through 26 September 2009
ER -