Integrated Dissemination System of Frequency, Time and Data for Radio Astronomy

Chen, Yufeng; Wang, Bo; Wang, Lijun; Grainge, Keith; Oberland, R.; Whitaker, Richard; Wilkinson, A.

doi:10.1109/jphot.2021.3054432

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…P RECISE time synchronization has become increasingly important for transportation [1], smart grid [2], contemporary space geodesy [3], high-resolution radio astronomy [4], and modern particle physics [5]. Among various kinds of time transfer techniques, the two-way time transfer technique is a promising one that transmits time signals symmetrically in both directions to cancel the time jitter for one-way transfer [6].…”

Section: Introductionmentioning

confidence: 99%

Secure Two-Way Fiber-Optic Time Transfer Against Sub-ns Asymmetric Delay Attack With Clock Model-Based Detection and Mitigation Scheme

Pan

et al. 2023

IEEE Trans. Instrum. Meas.

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Two-way fiber-optic time transfer (TWFTT) is a promising precise time synchronization technique with subnanosecond stability. However, the asymmetric delay attack is a severe threat, which can deteriorate the performance of the TWFTT system. In this article, a clock model-based scheme is used to defend the subnanosecond asymmetric delay attack. For the scheme, a security threshold is set according to a two-state clock model, and the estimated frequency difference is excluded from the measured time difference to detect the subnanosecond asymmetric delay attack. Systematic detection and mitigation scheme for asymmetric delay attack is developed in this article. Theoretical simulation and experimental demonstration are implemented to explore the feasibility of the method. A TWFTT system of time stability with 24.5, 3.98, and

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Section: Introductionmentioning

confidence: 99%

Secure Two-Way Fiber-Optic Time Transfer Against Sub-ns Asymmetric Delay Attack With Clock Model-Based Detection and Mitigation Scheme

Pan

et al. 2023

IEEE Trans. Instrum. Meas.

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Implementation of field-programmable Gate array-based clock synchronization in the fiber channel communication system

Xu,

Wang,

Guo

et al. 2024

Review of Scientific Instruments

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A sub-nanosecond clock synchronization scheme based on the field programmable gate array (FPGA) is proposed for the Fiber Channel (FC) communication system in this paper. The counter value of the slave node is synchronized to that of the master node through the embedded IEEE 1588 protocol over the communication link. In order to ensure the counter clocks have the same frequency in both nodes, which is recovered from the FC communication link, the clock phase difference is measured by the digital dual mixer time difference technique and the data recovery technique in the Gigabyte Transceiver, and then it is compensated by the mixed-mode clock manager in FPGAs. The proposed clock synchronization approach is evaluated with an FC communication system that has a serial rate of 12.5 Gbps, and the reported experimental results show that the proposed clock synchronization module can achieve a time difference lower than 1 ns.

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A Tampering Risk of Fiber-Based Frequency Synchronization Networks

Dai,

Chen,

et al. 2024

IEEE Trans. Instrum. Meas.

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Integrated Dissemination System of Frequency, Time and Data for Radio Astronomy

Cited by 4 publications

References 15 publications

Secure Two-Way Fiber-Optic Time Transfer Against Sub-ns Asymmetric Delay Attack With Clock Model-Based Detection and Mitigation Scheme

Secure Two-Way Fiber-Optic Time Transfer Against Sub-ns Asymmetric Delay Attack With Clock Model-Based Detection and Mitigation Scheme

Implementation of field-programmable Gate array-based clock synchronization in the fiber channel communication system

A Tampering Risk of Fiber-Based Frequency Synchronization Networks

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