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A microsecond-level alternative clock source for power grid synchronization network leveraging pulsar-based timekeeping technique
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DOI：10.1016/j.measurement.2025.117070.png)
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摘要
En 中文
To address the security vulnerabilities from power grid over-reliance on the Global Navigation Satellite System (GNSS), this paper introduces an alternative clock source utilizing a pulsar timing technique. The method is as follows: Initially, the phase of the observed pulsar profile at a specific moment is determined by comparing it with a preset standard profile. Then, a pulsar timing model is used to predict the expected profile phase at that moment. Finally, the local clock frequency is adjusted using a Proportional-Integral (PI) controller to minimize the discrepancy between the observed and predicted phase values, ensuring that the frequency and timing error of the local clock remain within acceptable limits. By analyzing real pulsar observation data released by the Parkes Telescope, it is found that proposed method can provide clock error detection precision at the microsecond level. Moreover, a prototype based on USRP is developed, and the effectiveness of the proposed method is validated through comprehensive simulation experiments. The results indicate that when a sufficiently fitted timing model is used, the method can provide timing services for power grid devices with no more than a 25-microsecond error without relying on GNSS.
Keyword:
Clock Synchronization
Pulsar Timing
Frequency Holding
Synchronized Measurement
