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摘要在日常生活和工业应用中，常用的通信手段是电磁波通信，但是电磁波通信在一些环境中并不能良好的工作，比如地下，水中，岩石和洞穴中，在这些环境中电磁波通信会遇到信道不稳定，天线尺寸大和路径损耗高等问题。
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为了解决地下通信中遇到的诸多问题，本课题将研究电磁感应技术代替传统的电磁波通信。首先分析和理解了电磁感应通信工作原理和诸多应用领域，比如蓝牙，人体等，然后对电磁感应与电磁波通信优缺点进行了比较。
在此基础上，本课题成功的建立了电磁感应通信系统模型，并对其发射功率和接收功率进行了计算，并用MATLAB仿真分析了电磁感应和电磁波通信的路径损耗、信噪比等。最后又研究了电磁感应波导技术，建立了电磁感应波导模型，通过定性分析其影响因素，在理论上为解决了传统电磁波通信高路径损耗和传播距离短等问题提供了有效方案。
但是仍然有一些问题没有解决，比如说对电磁感应误码率的分析和仿真，和电磁感应波导技术本身存在的误差缺陷的分析。
关键词 信道模型 电磁感应 地下通信 无线传感网络
毕业设计说明书（论文）外文摘要
Title Magnetic Induction Communications for Wireless Underground Sensor Networks
ABSTRACT
In daily life and industrial applications, the commonly used method of communication is the electromagnetic wave communication, but the electromagnetic wave communication does not work in some environments such as groundwater, water, rocks and caves, it will meet many difficulties in these environments because the electromagnetic wave communication channel is not stable, the size of the antenna and the path loss is high.
In order to solve the problems of underground communication, this paper will study the electromagnetic wave communication technology to replace the traditional electromagnetic induction. Firstly, we will get an understanding of the electromagnetic induction principle of communication and many other application fields, such as Bluetooth, body, and then the electromagnetic induction and then make an compassion between the electromagnetic wave communication and the electromagnetic induction communication.
On this basis, the project also establish the electromagnetic induction communication system model successfully and the make an analysis of the path loss by calculating the transmitting and receiving power .finally make a simulation of the electromagnetic induction and electromagnetic wave communication by MATLAB at last on the basis of electromagnetic induction we study a new waveguide technology, and established the electromagnetic waveguide model. through qualitative analysis of the influence factors, providing an effective scheme for solving the problem of the traditional electromagnetic wave communication high path loss and propagation distance in theory.
But there are still some unresolved problems, such as the analysis and Simulation of electromagnetic induction error rate, and the error analysis of defects and electromagnetic induction waveguide technique.
Keywords：Channel modeling MI waveguide technique underground communication wireless sensor networks
目录
1 引言 1
1.1 课题研究目的和意义 1
1.2 地下无线传感网发展背景 1
1.2.1 国外透地通信技术研究现状 1
1.2.2 国内透地通信技术研究现状 3
1.3 电磁感应与电磁波通信优缺点 4
1.4 本课题主要研究内容 4
2 电磁感应通信 6
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