Design and Implementation of Time-Synchronizing System Based on White Rabbit

With the continuous development of national telecommunication technology, there is an urgent requirement to deploy high quality time-synchronizing systems in different distribution scenarios, such as 5G Communication, Smart Grid, and Astronomical Monitoring, in order to satisfy various requirements, such as improving wireless space spectrum utilization and PMU steady-state accuracy. Currently, the emerging WR technology can achieve sub-nanosecond synchronization errors. However, it still has some drawbacks, such as the large time fluctuation required for synchronization and the difficulty in fine-tuning the link delayed compensation. Thus, the paper designs and implements a high precision time- synchronizing system with FPGA as the main control chip, which can guarantee synchronization errors better than 1 ns and accuracy better than 100 ps in the 10 km fiber transmission distance, control the time required for synchronization within the 20 s by algorithm improvement, and make the time delay compensation resolution up to 20 ps.