Abstract: Through researching on the time synchronization algorithm of wireless sensor network，a VTSP algorithm is proposed which is named as on-virtual timestamp synchronization protocal.In the VTSP algorithm，each node maintains their virtual timestamp，father node sends a beacon signal periodically，and child nodes adjust time to synchronize and refresh based on the beacon signal.Direct data communication often executes between the father and child nodes，as long as the same kind of child node has achieved synchrony and then data communication can be stable and reliable.The results of experiment show that VTSP algorithm has high precision and data communication has high efficiency.

Key words: wireless sensor network, time synchronization protocal, On-Virtual Timestamp Synchronization Protocal（VTSP） algorithm, virtual timestamp, data communication

摘要： 通过对无线传感器网络时间同步算法的研究，提出了一种基于虚拟时间戳的时间同步算法——VTSP算法。VTSP算法中，各节点维护自身的虚拟时间戳，父节点发送一个周期性的信标信号，子节点根据该信标信号进行时间同步调整和刷新操作，从而达到节点之间的同步性。数据通信往往是子节点与父节点之间的直接通信，因此只要同类子节点之间能够达到同步性就能够保证数据通信的稳定可靠。实验结果表明，VTSP算法具有良好的时间同步精度和数据通信效率。

关键词: 无线传感器网络, 时间同步算法, VTSP算法, 虚拟时间戳, 数据通信