Research On Key Technologies Of Underwater Simultaneous Wireless Information And Power Transmission In Magnetic Resonance Coupling

Underwater Wireless Sensor Networks(UWSNs)have important application value in marine exploration,hydrological monitoring,and oceanic development.In recent years,with the increasing complexity of the application of UWSNs,the traditional method of powering and returning data by means of metal cable has not been able to meet the actual needs.Wireless Power Transfer(WPT)and Near Field Communication(NFC)enable energy and information transmission without physical contact between transceivers,and seawater does not affect energy and The characteristics of the propagation of the near-field magnetic field of the information carrier.Therefore,based on the equivalent circuit theory and near-field electromagnetic field theory,this paper combines WPT technology with NFC technology to provide a good solution for the energy supply and data back-transmission of UWSNs.Aiming at the limited propagation distance of near-field electromagnetic field,which makes it not convenient to maintain stable magnetic coupling between energy and information transceiver equipment.This paper focuses on the relationship between power transmission energy and transmission medium,transmission and reception spacing.A ferrite core is inserted to increase the average magnetic permeability in seawater to improve the transmission and reception spacing,and the core parameters are determined through simulation calculation.At the same time,the internal magnetic field distribution of the coil is analyzed.For the problem of relative radial offset of the transmitting and receiving coils,an optimization method using ferrite core is proposed.The simulation analysis shows that the proposed method can effectively resist the radial offset caused by current disturbance,which improves the stability of the charging process.Aiming at the problem of data backhaul of UWSNs in complex environment,this paper proposes a wireless energy and information synchronization transmission method that transmits the sensor-side data back to Autonomous Underwater Vehicle(AUV).In this method,AUV is used to supply power and collect data when UWSNs are used to receive power and transfer data,the two sets of coils whose spatial positions are orthogonal to each other are used for energy and information transmission,which realizes the synchronization and independence of energy and information transmission process,which provides a solution for sensor power supply and data backhaul.Aiming at the requirement of the magnetic resonance coupling wireless energy transmission technology to coincide with the axes of the transmitting and receiving coils,this paper proposes an AUV attitude control method.By monitoring the transmitting characteristic parameters of the power supply terminal,the coupling status of the transmitting and receiving coils is determined,and then the relative angle between the transfer coil and the receiving coil and the attitude of the power supply end is obtained.The AUV attitude is adjusted by real-time feedback between the transmitting characteristic parameters and the attitude control processor,and the relative angles of the transmitting and receiving coils are optimized,so that the transmission characteristics are optimized.