Abstract:

As a support technology of wireless sensor networks, time synchronization algorithms become a research hotspot in recent years. Centralized time synchronization algorithms have been widely studied, which use the reference node via broadcast, flooding or multi hop to obtain time synchronization of the whole network. They achieve good accuracy, but robustness and scalability are poor. We propose a distributed time synchronization algorithm, which realizes time synchronization by fusing the time information of the whole network nodes. The algorithm can eliminate the influence of the transformation of network topology and the change of nodes' density on centralized algorithms. Experimental results show that the distributed time synchronization algorithm achieves the whole network time synchronization on several typical network topologies and is robust to the change of network topology and the number of nodes.

Key words: WSN;time synchronization;information fusion;consensus