基于参数交换和置信加权的信标广播时间同步

为提高多接收者时间同步系统的同步精度和可靠性,并建立优化的全局一致时钟,在已有方法上进行了若干改进。为区分节点的参考价值,在交换时戳过程中动态测量各接收者关键噪声方差;为进行高精度高可靠的时钟偏差校正和漂移率补偿,给出节点间置信加权方法和节点内动态收缩滤波方法。仿真表明,当各节点关键噪声水平相差较大时,置信加权能够较好地保持系统时间同步精度和可靠性;当参考时钟漂移率变化较慢时,动态收缩滤波能够对时间同步精度进行显著优化;综合使用置信加权和动态收缩滤波,通常能够显著提升系统时间同步精度和可靠性。

Reference broadcast synchronization utlizing parameter exchange andconfidence weighted combination

To improve the precision and reliability of the receiver receiver synchronization, and to provide an optimized global consensus time reference in each node, several improvements are discussed. To distinguish the values of nodes, measurements of critical noises variances are established during timestamp exchanging. To optimize the offset correction and drift compensation, the confidence weighted and dynamic shrinkage filtering in nodes are provided to improve the synchronization precision and the resilience abilities against nodal degradations and malfunctions. Simulation result shows that, the synchronization precision and reliability can be well maintained by confidence weighted even in the presence of sharply uneven critical noises in nodes. Also, the precision can be significantly improved by dynamic shrinkage filtering when changes of clock drift rates are within common ranges. Combining confidence weighted with dynamic shrinkage filtering, the precision and reliability of the receiver receiver synchronization can be improved remarkably.