Improving IEEE 1588 synchronization accuracy in 1000BASE-T systems

2015 ◽  
Author(s):  
Rodney Greenstreet ◽  
Alejandro Zepeda
Keyword(s):  
Ieee 1588 ◽  
Synchronization Accuracy

scholarly journals Maximum Likelihood Estimation of Clock Skew in IEEE 1588 with Fractional Gaussian Noise

2015 ◽  
Vol 2015 ◽  
pp. 1-24 ◽  
Author(s):  
Chagai Levy ◽  
Monika Pinchas
Keyword(s):  
Maximum Likelihood ◽  
Gaussian Noise ◽  
Likelihood Estimation ◽  
Packet Delay ◽  
Fractional Gaussian Noise ◽  
Clock Skew ◽  
Ieee 1588 ◽  
Accuracy And Precision ◽  
Ethernet Network ◽  
Synchronization Accuracy

To support system-wide synchronization accuracy and precision in the sub-microsecond range without using GPS technique, the precise time protocol (PTP) standard IEEE-1588 v2 is chosen. Recently, a new clock skew estimation technique was proposed for the slave based on a dual slave clock method that assumes that the packet delay variation (PDV) in the Ethernet network is a constant delay. However, papers dealing with the Ethernet network have shown that this PDV is a long range dependency (LRD) process which may be modeled as a fractional Gaussian noise (fGn) with Hurst exponent (H) in the range of0.5<H<1. In this paper, we propose a new clock skew estimator based on the maximum likelihood (ML) technique and derive an approximated expression for the Cramer-Rao lower bound (CRLB) both valid for the case where the PDV is modeled as fGn (0.5<H<1). Simulation results indicate that our new clock skew method outperforms the dual slave clock approach and that the simulated mean square error (MSE) obtained by our new proposed clock skew estimator approaches asymptotically the developed CRLB.

scholarly journals An optimization method of clock synchronization for large-scale regional power network based on IEEE 1588

2021 ◽  
Vol 2108 (1) ◽  
pp. 012063
Author(s):  
Yue Zuo ◽  
Xingcai Wang ◽  
Bo Zhang
Keyword(s):  
Large Scale ◽  
Clock Synchronization ◽  
Optimization Method ◽  
Frequency Deviation ◽  
Power Network ◽  
Regional Power ◽  
Time Service ◽  
Ieee 1588 ◽  
Noise Characteristics ◽  
Synchronization Accuracy

Abstract At present, mobile devices generally use GPS, Beidou and other satellite time service methods to obtain time, but the clock synchronization based on IEEE 1588 protocol still has deviation. To solve this problem, a clock synchronization method is proposed to improve IEEE 1588 protocol. Based on the analysis of IEEE 1588 protocol, the clock deviation and frequency deviation which affect the synchronization accuracy are modeled. The second-order Kalman filtering algorithm is used to recursively deduce the clock deviation and frequency deviation, and the Allan variance is used to verify the noise characteristics and constantly correct the clock deviation. Finally, the improved effect is verified by relevant experiments. The results show that the improved system can improve the synchronization accuracy.

μPMU based on wireless IEEE 1588 PTP

2020 ◽  
Author(s):  
khaoula Hassini ◽  
Ahmed Fakhfakh ◽  
Faouzi Derbel
Keyword(s):  
Ieee 1588
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