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Research Of Node Localization Technology Of Wireless Sensor Network In Wartime Hospital

Posted on:2012-12-05Degree:MasterType:Thesis
Country:ChinaCandidate:J JiangFull Text:PDF
GTID:2178330335974542Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
It is important to protect the safety and property of people's when emergencies or major disasters emerge. To achieve this goal, hospital should be able to locate the wounded, the hospital staff, and the materials, and the localization system should be fast, convenient, seasonable and accurate.For the purpose of localization in wartime hospital, a localization algorithm based on virtual anchor nodes and a sleep mechanism used for anchor nodes in location when the density of anchor nodes is big in the network are proposed. The goal is to locate quickly and accurately. The main works in this thesis are:1,Describe the condition of wartime hospital and the requirements of localization for the staffs and materials. Propose several localization algorithm of range-based and range-free. Analyze the characteristics of each algorithm.2,Design software and hardware for the localization system in wartime hospital, and consider the proposed method in real environmental for testing.3,Propose localization algorithm for localization system in wartime hospital based on virtual anchor nodes. The distance between two nodes is replaced by product of hops and average distance of per hop. Hop is got by hop subdivision with signal power. Average distance of per hop is got through revising with least square method. Localization is finished by trilateral or multilateral locating methods. On this basis, located nodes is upgraded to virtual anchor nodes and become one of the members to locate the rest unknown nodes. Higher accuracy of the algorithm with small density of anchor nodes is showed in simulation4,Propose based on sleep mechanism used for anchor nodes, which is used to confront the redundancy information of anchor nodes in the network with big density of anchor nodes in wartime hospital. Analysis the special network with big density of anchor nodes, and design a type network model of anchor nodes crowed, which used for studying the localization of nodes with redundant anchor nodes. To study the localization algorithm in the model, a sleep mechanism of anchor nodes is proposed. The anchor nodes crowed were ordered and divided into groups in the localization process of the internal unknown nodes. The works improves localization accuracy and extend the life of anchor nodes. It has some reference value for localization algorithm of local network with big density anchor nodes.Both the algorithms aimed at quick and accurate localization in wartime hospital and meeting the needs of wartime hospital. MATLAB simulation and testing prove their contribution to digital construction of wartime hospital.
Keywords/Search Tags:Wireless Sensor Networks, Node localization, Virtual anchor node, Redundant, Anchor node sleep
PDF Full Text Request
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