Research On Recovery Method Of Large-scale Coverage Holes In WSN By Multiple Airships Under Disaster Environment

The wireless sensor network(WSN)is a wireless network composed of a large number of sensor nodes in a self-organizing and multiple hop manner.After major disasters,there are large-scale coverage holes in the WSN at the same time,which leads to a global cascading failure phenomenon.At this time,the repair mechanism of the WSN cannot operate and the coverage holds need to be repaired in the aid of airships.In order tocomplete the task of repairing the coverage holes in WSN,two methods of repairing the coverage holes are proposed in this paper.The specific research contents are as follows.Firstly,the problem of repairing the coverage holes in multi-aircraft and heterogeneousWSNs with coverage priority is studied,and a method for repairing the coverage holes in multi-aircraft and heterogeneous WSN with coverage priority is proposed.The MW-Voronoi diagram is used to perform block-by-block research on networks with coverage priority.A mathematical model for repairing the coverage holes is established on the basis of the theory of repairing coverage holes.The airship layout algorithm mentioned in this paper will enable the airship to reach the optimal deployment position to obtain the largest total weighted coverage area,and complete the task of repairing coverage holes in WSN.Secondly,the problem of repairing the coverage holes in multi-aircraft WSNs with coverage priority covered with obstacles is studied.Aiming at the fact that the existing methods have low coverage and slow convergence,a new method for repairing coverage holes with relatively high adaptability is proposed.By establishing a coverage hole repair model and deploying the airship according to the new layout algorithm,it can smoothly reach the optimal deployment position by flowing round obstacles,and obtain the largest total weighted coverage area,thereby completing the task of repairing the coverage holes in the WSN.Finally,the simulation experiments of the two methods of repairing coverage holes mentioned in this paper and the existing methods are performed on MATLAB software.The proposed method and the existing method are compared from the aspects of coveragerate,repair time,etc.,which proves the validity of the two proposed methods.