Simulation And Implementation Of Underwater Electromagnetic Field Wireless Communication System

The ocean is the source and cradle of life on earth.For hundreds of millions of years,the creatures in the ocean have been evolving,and the "treasure" contained in the underwater world is becoming more and more mysterious.For a long time,people have never stopped exploring the ocean.In order to explore the mystery of underwater world,people use various means to explore underwater world.As one of the important means to explore the underwater world,underwater communication is the "light" for people to explore the dark underwater world.In this paper,the wireless communication technology of underwater electromagnetic field is studied through theoretical analysis,modeling simulation and system implementation.The main research contents and achievements are as follows:1.For special underwater environments,this article has studied the propagation characteristics of electromagnetic waves in lossy media through theoretical analysis.The results show that the propagation characteristics of electromagnetic wave in lossy media will change with frequency,media and other factors.In two-layer media,there are three paths of electromagnetic wave from the source point to the site,which are direct path,reflection path,up-down path.The problem of electromagnetic wave propagation path in multi-layered media can be transformed into the problem of superposition of electromagnetic wave propagation paths in multi-layered media.The field components of field points in multi-layered media are generated by the interaction of multiple paths.2.For the antenna in the lossy medium,this paper uses MATLAB to analyze and compare the electric dipole and magnetic dipole antenna models and their radiation characteristics in the lossy medium.The results show that in the lossy medium,the dipoles with low frequency electromagnetic waves are used.The antenna mainly considers the radiation characteristics of its near field.The radiation characteristics of the antenna are related to the electromagnetic wave frequency and the electromagnetic characteristics of the medium.3.For the special environment of underwater multi-layer media,this paper uses CST electromagnetic simulation software to study the propagation characteristics of electromagnetic fields in different media models.For deep sea application scenarios,establish an infinite seawater medium model;for near-water surface application scenarios,establish an air-seawater medium model;for offshore application scenarios,establish a seawater-soil medium model;for shallow water application scenarios,establish air-seawater-soil Three-layered media model.The results obtained after modeling and simulation show that in different media models,the propagation characteristics and amplitude-frequency characteristics of electromagnetic fields are quite different,and the medium and electromagnetic wave frequencies will affect the propagation characteristics of electromagnetic fields;The radiation field characteristics of electric dipoles in air-sea water medium,sea water-soil medium,and air-sea water-soil medium are better than the radiation field characteristics of electric dipoles in infinite sea water medium;the two layers are verified through data comparison analysis And the propagation path of the electromagnetic wave from the source point to the field point in the three-layer medium.The influence of model parameters on the radiation field propagation characteristics of electric dipoles is also studied in this paper.The electrode spacing and interpole current will affect the radiation field propagation characteristics of electric dipoles.In multilayer media,the source point depth will affect the electric dipoles.The radiation field propagation characteristics of the particle,different source point depths show different radiation field propagation characteristics.4.Based on the simulation analysis of the underwater electromagnetic field communication channel and the theoretical basis,this paper designs and implements an underwater electromagnetic field wireless communication system.Based on the simulation data,the communication system is designed for power.The reliability and feasibility of the underwater electromagnetic field communication system are verified by external field tests.At the end of this article,the shortcomings and development prospects of underwater electromagnetic field wireless communication systems are briefly described.