Research On Recovery Methods Of Coverage Holes In WSN By Multi-airship In Disaster

Wireless sensor network(WSN)is an important technical means to realize the awareness monitoring,pre-disaster prevention,and post-disaster rescue of natural disasters.The poor geographical environment in the disaster area makes it difficult to redeploy sensor nodes.As a new observation technology,unmanned airship can effectively solve the problem of node deployment in harsh environments.Therefore,the main purpose of this project is to use the unmanned airship as a heterogeneous node to complete the task for coverage hole repair in disaster area.Firstly,the basic theory of WSN covering hole repair is expounded.It introduces that structure of WSN,the problem of coverage,the problem of node deployment,which is the important support for the research of WSN' s covering voiding repair and which is a necessary knowledge to solve the problem.Secondly,a model for repairing the coverage holes of a multi-airship was constructed.In order to realize the purpose of void repair,the airship-to-ground communication model and network deployment model were designed.The earth-to-ground communications model introduces directional antenna communication tools to reduce power loss in efficient communications.The network deployment model is based on the requirements of the node density range and determines the complete coverage of the restoration goals.After the deployment is completed,the airship node can communicate with the ground node,complete the monitoring task within the disaster area,and achieve the goal of network coverage hole repair.Thirdly,the deployment algorithm for multi-airship deployment nodes was designed.In order to improve the post-deployment network monitoring capabilities and the accuracy of perceived information,a heterogeneous triangulation algorithm for unmanned airship node deployment was proposed.The algorithm performs the geometrical subdivision of the target monitoring area and performs deployment and site selection.It can make the distribution of airship more uniform under the premise of satisfying the complete coverage,and effectively improve the utilization rate of the airship node.Finally,the feasibility and effectiveness of this algorithm are verified by comparison and analysis of experimental data.This topic research belongs to the cross field of WSN and unmanned airship technology,is a hotspot of research on the present problems.The final research results of this project have played a positive role in both theoretical support and practical application of the two technologies.