一种改进的DFD无线传感器网络节点故障诊断算法研究

无线传感器网络是远程分布式环境监测的重要手段。节点故障诊断作为无线传感器网络的关键技术之一,是无线传感器网络大多应用领域不可或缺的环节。DFD算法是一种可应用于无线传感器网络的节点故障诊断算法,通过网络内邻居节点间的数据交换和相互测试诊断出故障节点。对DFD算法的诊断判据进行了修改,提出了改进的DFD算法。仿真结果表明,改进的DFD算法能适用于待诊断节点的邻居节点数较少、节点故障率较高的传感器网络,且大大提高了故障诊断精度。

Research on an Improved DFD Algorithm for Node Failure Diagnosis in Wireless Sensor Networks

The wireless sensor networks(WSNs)is an important method for remote and distributed environment monitoring.As one of the key technique involved in WSNs,diagnosis of node failures is indispensable in most WSNs applications.The DFD(Distributed Fault Detection)algorithm,which checks out the failed nodes by data exchanging and mutual testing among intra-network neighbor nodes,can be applied for failure diagnosis.In this paper,the diagnosis criterion for DFD algorithm is amended,and an improved DFD algorithm is proposed.Simulation results demonstrate that the improved DFD algorithm is able to deal with the WSNs where the neighbor number of nodes to be diagnosed is all small and the node's failure ratio is high.They also show that the improved DFD algorithm could greatly increase the diagnosing accuracy.