Research On Underwater Wireless Cross-media Communication Technology Based On Magnetic Induction

The ocean is a key area in the future military field and strategic development,and more and more countries are deploying observation networks there.More and more new communication technologies are emerging because traditional acoustics cannot meet the needs of cross-media communication and underwater dense sensor network deployment.Magnetic induction communication is the most advantageous scheme in cross-media and underwater sensor networks.Compared with acoustics,magnetic induction communication has the characteristics of consistent air-water permeability,stable channel,fast speed and small delay.It also has the advantages of no harm to Marine organisms,strong concealment,flexible volume and low cost,so it has a good application prospect in civil and military.In this paper,the wireless magnetic induction communication technology in underwater and cross-media is studied.Firstly,starting with the theory of magnetic induction communication in different media,the relationship between magnetic field propagation law and frequency and media parameters is studied,and the feasibility of cross media is analyzed.Secondly,the magnetic induction communication with different receiving and transmitting forms is modeled,the path loss and theoretical channel capacity are described by formulas,and the calculation model is connected with the magnetic induction intensity.A transceiver configuration based on three-axis coil is proposed,and its underwater communication system in cross dielectric scenario is optimized.A positioning algorithm based on three-axis coil is given to control the node position,and the schemes of transmitter and receiver are optimized based on the algorithm.Finally,a set of magnetic induction communication system is designed and implemented,the specific schemes are given from the hardware and software levels,and the problems of underwater experiment are discussed.The system realizes a variety of modulation and demodulation schemes at the physical level,and completes the forwarding processing of text and pictures at the application level.At last,good communication effect is achieved in air medium,water medium and cross medium experiment.