无线传感器网络数据融合协议比较

传感器网络由电池能量受限的节点组成,必须采用一种能量有效的方法收集节点感知的信息,如果每个节点都采用单跳方式将其感知的数据直接传输给汇聚节点,则与汇聚节点距离较远的节点能量将很快被耗尽。应用于无线传感器网络的LEACH协议提出了通过分簇实现数据融合的方法,簇头在接收到本簇成员的数据后进行融合处理,最终,将融合结果传输到汇聚节点。另一种应用数据融合的PEGASIS协议,是一种接近理想的基于链状的协议,它在LEACH协议的基础上做出了改进。在PEGASIS中,每个节点只与一个位置最近的邻居进行通信,并且,轮流传输数据到汇聚节点,然后,降低每一轮中的能量消耗。模拟结果表明:采用PEGASIS协议有效地延长了网络的生存时间。

Comparison of wireless sensor network data fusion protocol

Sensor network contains a large number of nodes,whose battery power is very limited.It's very important for us to use an energy efficient manner to collect sensing information from sensor nodes.If every node transmits the sensing data directly to the sink node,then the nodes which are far from the sink node will deplete their power quickly.LEACH gives a way of aggregating data by forming some clusters.Each cluster head will incorporate data fusion to reduce the amount of information which is received by other nodes in the same cluster,the aggregated result will be transmitted to the sink node.Another protocol—PEGASIS,which is a near optimal chain-based protocol is an improvement over LEACH.In PEGASIS,each node communicates only with a close neighbor and takes turns transmitting the data being aggregated to the sink node.Thus it will reduce the amount of energy spent per round.The simulated result shows that PEGASIS protocol prolongs the lifetime of sensor network effectively.