【作者】 王卫星； Axel Jantsch； 宋淑然；

【Author】 Weixing Wang1, Axel Jantsch2, Shuran Song1 (1.Dept. of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China; 2.Lab of Electronics & Computer System, Royal Institute of Technology (KTH), SE-16440, Sweden)

【机构】 华南农业大学工程学院； 瑞典皇家工学院电子与计算机系统实验室；

【摘要】 考虑在测量作物冠层温度,进行基于作物水分胁迫指数(CWSI)的研究时,红外测温仪的安装高度应是作物冠层上方 1m 处,因此本文提出一种正六边形的传感器节点分布方案。为了获得无线传感器网络的最大寿命,提出了基于节点最大剩余能量的竞选簇头方法。通过 ns-2 程序模拟,得到了不同节点电能损耗下的簇头竞选参数θ,以及第一个节点死亡和最后一个节点死亡两种情况下的网络生存时间。结果表明,θ值虽节点能量消耗速度降低而减小。更多还原

【Abstract】 To match the needs of applying infrared thermometers to monitor crop CWSI in making irrigation decision, a distribution of nodes in the form of hexagon was developed by which a node can reach maximum 6 other nodes in the same distance. An algorithm for electing the cluster head node based on the maximum residual energy was suggested for the purpose of even distribution of energy consumption in the overall network and obtaining the maximization of the network’s lifetime. The optimal θ value was obtained from different node energy consumption in a variety of cases. Results show that the θ value decreases as the rate of energy consumption of nodes reduces. The lifetime was evaluated when the first node dies and the last node dies.更多还原