无线传输毕业论文.doc

摘 要 随着石油工业的发展，我们越来越需要通过简捷的方法对井下进行实时的监测，及时快捷的把井下信息传递到井上来，传统的有线传输方式已经不适合所以需要进行无线传输，但是由于油井是直径很小的114mm管道，而且里面充满了油水，所以信号衰减很大传输距离很短。 本文主要是研究在这种情况下无线传输的特性，以及如何更好的避免衰减，尽可能提高传输距离和速率。文章从理论上分析了不同传输方法在水中传输的优缺点。在此基础上，文章对电磁波在水中以及管道中传输特性进行了推导和研究，得出了一些在水中和管道中的传播特性。接着文章通过CST微波仿真软件对各种环境下电磁波传输进行了仿真，得出了在特定注水管道截面半径下最合适的尺寸。 然后进行了一些针对性实验，实验结果表明，该频率确实是适合于该尺寸下注水管道，能够得到更远的传输距离。这里只是进行了些理论研究，该工程还要许多方向可以尝试，在以后工作中可以进行改进。 关键词：石油工业 油水管道 无线传输 电磁波传输特性 Abstract With the fast developing of the oil industry，simple?methods to?get the real-time? monitoring of the underground and then transmit the information as soon as possible from?the?underground?to?Inoue are more and more needed. The traditional cable way is not suitable, so wireless way is necessary. But the diameter of wells are as small as 114mm，and full of fixed water and oil，so we can see significant?signal attenuation and the transmission distance is very short. This paper is to study the characteristics of?wireless transmission in this case，and how to avoid the attenuation better，try my best to maximize?transmission distance?and rate. The paper first analyzes the transmission in water of different advantages and disadvantages. On this basis the paper do the research on the transmission character on the electronic wave in the water and pipeline to get some results. Then the paper introduces the simulation of microwave by using the CST2009 to get the?most appropriate?size of?the radius of the pipe full of water. At last some specific experiments have been done，and the results show that the frequency I get through the simulation is the best to get longer transmission distance. The research I did is just theoretical ，the project can be tried in more ways in the future. Key Words: Oil Industry Oil Pipeline Wireless Transmission Character 目 录 摘 要 I Abstract II 1 绪论 1 1.1 课题概述 1 1.2 课题研究背景和目标 1 1.3 论文的研究内容及安排 2 2 无线传输理论研究 3 2.1 短距离无线传输传播原理及应用 3 2.2 水下无线通信研究 5 2.3 圆形管道中电磁波传输 8 2.4 本章小结 12 3 仿真研究以及分析 13 3.1 仿真工具介绍以及