Research on Coverage Reinforcement Strategy in Ocean Surveillance Wireless Sensor Networks

Ocean surveillance wireless sensor networks are easily affected by environmental factors such as ocean currents and waves, causing the passive movement of sensors, resulting in coverage holes in the monitoring area. Due to the relative positions between sensors and the information interaction of neighboring nodes, a coverage reinforcement control strategy in ocean surveillance wireless sensor networks is proposed. This strategy first constructs the Voronoi diagrams of the deployed sensors, and detects coverage holes according to the distance between sensor nodes and the Voronoi vertexes. Then, the number of coverage holes as well as the elements of each hole circle can be obtained by mathematical calculation. Furthermore, the sensors' deployment positions are calculated by the position of the nodes and the Voronoi edges, which maximize the coverage rate of the area. Finally, the coverage holes are healed by incremental deployment. The simulation results show that the proposed strategy is able to calculate the number and size of the holes accurately, and increase the coverage rate of the target area with a small computational complexity by incremental deployment, which achieves the reinforcement of the networks.