Research on Time Synchronization of Improved Clock Servo System Based on PTP Protocol

The time offset correction mechanism based on the traditional clock servo system cannot meet the requirements of the IEC61588 protocol for time synchronization accuracy. Due to most algorithms based on optimizing time offset use precise control of time stamps, PI controllers, etc., the optimization effect of the algorithm is low. For the above problems, this paper proposes an improved clock servo system based on the PTP protocol to optimize the time offset, and uses the Kalman filter to ensure the time accuracy of the master-slave clock. Combined with the Kalman filter, the multi-model PI control optimisation algorithm is proposed on the basis of the traditional PI controller to improve system stability by adding a threshold limiting method. Finally, the general master-slave hierarchical topology of the PTP system is built using the OMNeT++ simulation platform to verify the correctness of the improved clock servo system. The time offset of the master-slave clock is less than 10us, which further proves the superiority of the servo system in this paper.