淮阴师范学院学报(自然科学版）

针对多用户端对端通信中主从时钟间较大的传输延时和时钟偏差及复杂的模型使得计算时钟源质量系数变得困难进而影响时间同步过程中本地时间准确反馈的问题，提出多用户端对端通信轻量级精确时钟同步算法．通过周期性发送信号并记录收发时间戳高效测算主从时钟间的传输延时和时钟偏差得到主从时钟的偏差数值和网络延迟数值，建立节点时钟状态模型分析时钟控制节点并计算时钟源质量系数得到包含稳定的传感器时钟及其状态模型用于后续修正，训练节点时钟状态模型结合计算误差利用PID(Proportional Integral Derivative)控制算法对多用户端对端通信轻量级时钟偏差进行轻量级调整得到修正后的时钟同步定值．根据信号收发时间和时钟参数反馈本地时间，判断数据准确性并发送时钟同步信息，实现多用户端对端通信轻量级精确时钟同步．实验表明：所提算法主从时钟的偏差数值明显降低，平均偏差从8ms减少到最大不超过4ms，部分点甚至达到零偏差，证明了本文算法在纠正时钟频率偏差、降低偏差幅值方面的有效性．所提算法误差数值在初始阶段虽有较大变化但随后迅速稳定在零状态，相对稳定．所提算法具有较高的同步精度和自动修正能力，确保了系统时间的准确性和稳定性．

In multi-user end-to-end communication,there is a significant transmission delay and clock bias between the master and slave clocks.The complexity of the model makes it difficult to calculate the clock source quality coefficient,which in turn affects the accurate feedback of local time during the time synchronization process.The above issues have led to insufficient clock synchronization stability and accuracy.A lightweight and precise clock synchronization algorithm for multi-user end-to-end communication is proposed.By periodically sending signals and recording the sending and receiving time stamps,the transmission delay and clock deviation between the master and slave clocks can be efficiently calculated,and the deviation values of the master and slave clocks and network delay values can be obtained.Establish a concise node clock state model,analyze clock control nodes,and calculate clock source quality coefficients to obtain a stable sensor clock and its state model for subsequent correction.Train a node clock state model,combine calculation errors,and use PID(Proportional Integral Derivative)control algorithm to make lightweight adjustments to the clock deviation of multi-user end-to-end communication,obtaining a corrected clock synchronization setting.Based on the signal transmission and reception time and clock parameters feedback local time,determine data accuracy and send clock synchronization information to achieve lightweight and accurate clock synchronization for multi-user end-to-end communication.The experimental results show that the proposed algorithm significantly reduces the deviation value of the master-slave clock,with an average deviation reduced from 8 ms to a maximum of no more than 4 ms,and some points even reaching zero deviation.This fully demonstrates the effectiveness of the algorithm in correcting clock frequency deviation and reducing deviation amplitude.At the same time,although the error value of the proposed algorithm undergoes significant changes in the initial stage,it quickly stabilizes at zero and remains relatively stable thereafter.The proposed algorithm has high synchronization accuracy and automatic correction capability,ensuring the accuracy and stability of system time.