Magneto Inductive Communication System Based On Active Relaying Scheme

As an important strategic treasure house of human development,the ocean is abundant in resources.Nowadays,people take a variety of ways to explore and utilize marine resources,including deep-sea vehicles or deep-sea observation stations and observation networks.However,with the increasingly intensive development of underwater communication,there are more requirements for the real-time communication of various sensor devices and nodes,and it is difficult to adapt to the needs of large-scale and high-density sensor networks in the future by using today's mainstream acoustic communication.As a new communication method in recent years,Magneto-Induction(MI)communication has the characteristics of stable and predictable channel response,negligible propagation delay,slight influence with multipath and Doppler effect,stealthy and low cost.With the exploration of researchers,MI communication has many applications in underwater and underground communication systems,including leakage detection,disaster monitoring,underwater wireless sensor network(UWSN)monitoring,etc.In addition,MI has the stealthy characteristic and the ability to implement cross-media communication,it has a certain usage in military applications.The main aim of this paper is to research and develop a set of underwater MI communication system,including the establishment of MI channel model,the scheme of MI relaying technology and the implementation of magnetic induction communication system.In the chapter of MI channel model,the paper starts from the basic theory of electromagnetism,and then uses the basic principle of electromagnetism to construct the channel model of MI communication by using field analysis and equivalent circuit analysis.Then the reliability of MI communication is analyzed,and the communication robustness of MI communication is improved by constructing three-dimensional coil model.In the chapter of MI relaying technology,two kinds of relaying technology are introduced: MI waveguide technology and active relaying technology.For waveguide technology,we give its performance through equivalent circuit analysis;For active relay technology,we constructs the relay scheme and designs its protocol.Finally,its performance evaluation is given.In the chapter of the implementation of MI communication system,the MI communication system is implemented from two aspects which are hardware design and software implementation.In the hardware design,the whole circuit is modularized,which is divided into processor circuit,power supply circuit,signal generation and modulation circuit,power amplifier circuit,demodulation circuit and antenna matching circuit.Based on the implementation of hardware circuit and interface design,the software of MI communication prototype is realized,and the design methods and flow charts are given.After the theoretical research and system implementation,this paper will test the hardware circuit and carry out the joint debugging experiment for the whole system.The feasibility and effectiveness of the design are verified by combining with theoretical simulation and experimental results.