为构建基于无线传感器网络的铁路防灾安全监控系统,在门限敏感的节能型网络协议(TEEN)基础上,提出1种安全优先门限敏感分簇路由协议(SPTC).确定SPTC的网络架构,基于能量计算公式设计簇头分布算法及簇头和副簇头选举算法,以及路由建立步骤和数据采集流程.在协议中定义副簇头,保证数据路由的可靠性及数据自身传输的安全,提高协议的安全性；在汇聚节点(SN)附近区域布置更小规模的簇,在兼顾剩余能量与节点距离的准则下选择最佳的簇头节点,以提高协议的节能性.采用OMNeT++网络仿真工具对SPTC进行了建模仿真.仿真结果表明:当网络工作了10 000 s时,低能量节点数量比低功耗自适应聚类层次协议(LEACH)减少了60％；当灾害数据采集概率为0.5％时,基于SPTC协议的网络检测周期是基于LEACH的1.7倍.%A Safety-Priority Threshold sensitive Clustering routing protocol (SPTC) was proposed to construct wireless sensor network based railway disaster prevention and safety monitoring system on the basis of Threshold sensitive Energy Efficient sensor Network protocol (TEEN ). The network frame of SPTC was presented and according to energy calculation formula, SPTC cluster head distribution algorithm, cluster and vice cluster head election algorithms were designed, and the routing construction steps and the data collection procedures were described. The vice cluster head was introduced in SPTC to guarantee the reliability of data route and the safety of data transmission, and then the safety of the protocol was improved. The little-scale clusters were configured near Sink Node (SN), and the optimal cluster head was selected based on the principle of compromising the residual energy and the distances between nodes to improve energy saving property. SPTC was modeled with the OMNeT++ and the simulation results show that compared with Low-Energy Adaptive Clustering Hierarchy (LEACH), the number of the low energy nodes in SPTC is decreased by 60% when the network works for 10 000 s. If the disaster data collection probability is 0. 5%, the network detection cycle based on SPTC is 1. 7 times of the cycle based on LEACH.
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