时间同步作为无线传感器网络的关键技术之一,对整个无线传感器网络的发展起着不可替代的作用.提出了类似于分簇结构的基站—簇首—组首—组内的层次结构.在基站簇首之间采用了单向广播同步机制和双向成对同步机制,有效利用网络中节点的广播信息；在簇首组首之间采用了主动和被动结合的双向同步算法；在组内采用了TPSN算法；用实验仿真的方式,清晰的显示出这种层次结构的特点；将这些算法结合在一起,在保证精度的前提下,大幅度的降低了能量消耗.%Time synchronization is one of the key technologies for wireless sensor networks, and that plays an irreplaceable role for the development of the entire wireless sensor network. A the base station - the first cluster-the first group - the group's hierarchy is proposed similaring structure of clustering. It combines unidirectional reference broadcast and pair-wise mechanism between the base station and the first cluster, the messages for time synchronization are reduced greatly. A combined active and inactive two-way synchronization algorithm is used between the first cluster and the first group. In experimental simulation, it clearly shows the characteristics of this hierarchy. Combination of these algorithms are not only ensure the accuracy of network, but also greatly reduce energy consumption.
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