关键词: 时间同步, 信标广播, 时钟参数交换, 置信加权, 收缩滤波

Abstract: 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.

Key words: time synchronization, reference broadcast, clock parameter exchange, confidence weights, shrinkage filtering