DEVELOPMENT OF ROBUST TIME SYNCHRONIZATION METHOD FOR WIRELESS SENSOR NETWORK

Abstract

One of the most important topics in the research of wireless sensor network is the time synchronization among sensor nodes. Especially, acceleration measurement applications for civil infrastructure sensing require the synchronization at the highest level. This paper presents the broadcast time stamp based synchronization method. This method uses i) robust hardware for wireless communication, and ii) 2 CPUs for each sensor node. Each CPU on a node is specialized for i) processing of time stamp and ii) acceleration measurement. Robustness and the accuracy of the time synchronization has been experimentally evaluated and robust synchronization with the accuracy of hundreds of μs has been validated.