The implementation of IEEE 1588 clock synchronization protocol based on FPGA

Yin, Hongpeng; Fu, Ping; Qiao, Jiaqing; Li, Yuping

doi:10.1109/i2mtc.2018.8409617

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…In this section, we present algorithms used to improve the performance of IEEE 1588. The IEEE 1588 standard has been researched and implemented using both software and hardware [13]- [17]. Because the PTP uses timestamps to correct the time between slave nodes and the master, the accuracy of the synchronization method depends on the timestamped position.…”

Section: Related Workmentioning

confidence: 99%

“…Using the software method, the trigger time is near the operating system, the jitter time is relatively large, and the time offset is within 100 microseconds [13]- [15]. With hardware-based timestamps, the trigger time is executed in or near a physical layer, the jitter time is less than in the software method, and the accuracy is on the order of nanoseconds [16], [17].…”

Section: Related Workmentioning

confidence: 99%

“…In practice, if the damping coefficient is held to a constant value, ζ = 0.5, the bandwidth value is BW 2 = w 2 n * 3.08. Based on (15), the values of k p , k i can be expressed by (17) and (18), respectively: k p = 2ζ ω n = BW * 0.57 (17) k i = ω 2 n = BW /3.08 (18) A normal oscillator has a high frequency variation, and the value after fuzzy-PI compensation is multiplied by U A 1000000000 to adjust the part per billion units of the oscillator frequency [13].…”

Section: ) Clock Modelmentioning

confidence: 99%

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An Adaptive Fuzzy-PI Clock Servo Based on IEEE 1588 for Improving Time Synchronization Over Ethernet Networks

Nguyen

Jeon

2020

IEEE Access

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A network-based control system includes many connected devices, and time synchronization plays an important role in the unified operation of those systems. A clock servo needs a guarantee time offset and a clock rate to minimize the time difference between devices. This paper proposes an adaptive clock servo to improve time synchronization. This proposed algorithm uses a fuzzy-based proportional-integral clock servo (fuzzy-PI) based on IEEE 1588 to reduce the frequency of clock compensation. This method adapts the bandwidth and enhances noise reduction, improving both the time offset and rate difference between the slave and master. The node time can synchronize with the master time after just one cycle of synchronization. Experiments validated the effectiveness of the algorithm and demonstrated that the slave can track the master with the mean and standard deviation of the time offset are 0.432ns and 4.402ns. A cycle time of one second is used to ensure a low-bandwidth network. With these results, the number of nodes over a real-time network can be increased.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: ) Clock Modelmentioning

confidence: 99%

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An Adaptive Fuzzy-PI Clock Servo Based on IEEE 1588 for Improving Time Synchronization Over Ethernet Networks

Nguyen

Jeon

2020

IEEE Access

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“…The IEEE 1588 PTP provides sub-microsecond synchronization accuracy supported from both hardware and software to overcome the delay problem in a network environment. As a master-slave relation-based time synchronizing method, the IEEE 1588 PTP maintains its preciseness by synchronizing slave clock’s time and frequency to a master clock as shown by many previous researches [ 2 , 3 , 4 , 5 ]. Because of its preciseness, many time synchronization profiles based on the IEEE 1588 PTP, especially for power system applications, have been specified [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System

Son

Chang

2020

Sensors

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This paper proposes a distributed nodes-based clock synchronization method to sustain sub-microsecond precision synchronization of slave clocks upon master clock failure in IEEE 1588 PTP (precision time protocol) system. The sustaining is achieved by synchronizing the slave clocks to the estimated reference clock which is obtained from the analysis of distributed slave clocks. The proposed method consists of two clock correction functions (i.e., a self-correction and a collaborative correction, respectively). Upon master failure, the self-correction estimates a clock correction value based on the clock model which is constructed during normal PTP operation. The collaborative correction is performed in the preselected management node. The management node estimates a reference clock by collecting and analyzing clock information gathered from the other slave clocks. The performance of the proposed method is simulated by computer to show its usefulness. It is confirmed that the fifty (50) clock model-based collaborative correction maintains 10−6 second PTP accuracy for 10 min prolonged period after the master failure when tested with clock offset variations less than 50 ppm.

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“…The IEEE 1588 Precision Time Protocol (PTP) [1] was published as a standard for the provision of Ethernet-based precise time-synchronization means for such industry applications. The IEEE 1588 PTP-based time synchronization mechanisms, as shown by many previous studies [2,3,4,5], are based on the basic functional elements to estimate a local clock’s time offset in reference to a master clock and to adjust the local clock’s time and frequency. IEEE standard c37.238-2011, 2017 [6,7] was published to provide required specifications, including less than 1.0 microsecond of timing error bound, for advanced operation and protection of IEC 61850-based digital substations [8,9].…”

Section: Introductionmentioning

confidence: 99%

Improved Time-Synchronization Algorithm Based on Direct Compensation of Disturbance Effects

Seo

Son

et al. 2019

Sensors

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In this paper, an improved time-synchronization algorithm is proposed. The improvement of time synchronizing performance was achieved by introducing a stochastic model-based direct compensation of the disturbance effects appearing in the IEEE 1588 Precision Time Protocol (PTP)-based time synchronization system. A dynamic model of PTP clock system was obtained by reflecting the three major sources of disturbances, i.e., clock frequency drift, clock rate offset, and network noise. With the application of the dynamic model of the PTP clock system, the effects of the disturbances can be effectively eliminated in the PTP time synchronization control loop. Computer simulations are performed to verify the performance of the proposed time synchronization algorithm by applying the various types of disturbances, including network noise and clock drift. The simulation results are compared with those of other representative time synchronization algorithms, i.e., IEEE 1588 PTP algorithm and Kalman-filter-based algorithm. It is shown that the proposed algorithm improves time synchronizing performance up to 84% with respect to that of the Kalman-filter-based synchronization algorithm when simulated with colored noise type disturbances. The proposed time synchronization algorithm is expected to contribute for the realization of future Ethernet-based industry-plant monitoring and control including IEC 61850-based digital substation.

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The implementation of IEEE 1588 clock synchronization protocol based on FPGA

Cited by 14 publications

References 5 publications

An Adaptive Fuzzy-PI Clock Servo Based on IEEE 1588 for Improving Time Synchronization Over Ethernet Networks

An Adaptive Fuzzy-PI Clock Servo Based on IEEE 1588 for Improving Time Synchronization Over Ethernet Networks

Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System

Improved Time-Synchronization Algorithm Based on Direct Compensation of Disturbance Effects

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