基于WiFi技术的井下视频传输系统的设计与实现

发布时间：2018-07-03 06:02

本文选题：WiFi + 技术　；参考：《辽宁工业大学》2014年硕士论文

【摘要】：随着经济的发展，我国对于煤炭的需求与日俱增。煤炭开采规模越来越大，也就意味着有越来越多的矿工需要在井下作业。目前，大多数矿山企业都采用有线传输的方式，一旦发生矿难，有线线缆被破坏，视频传输就会立即中断，进而使井上搜救人员不能及时了解井下被困人员的情况，影响救援的决策与进度。因此，有必要建立一套完整的井下视频无线传输系统。WiFi技术应用于井下无线视频传输系统具有速度快、可靠性高、灵活性好、传输距离远，抗干扰能力强等优点，同时方便与现有的有线以太网络整合，组网的成本更低。因此，，本文将WiFi技术应用于井下视频传输系统。本论文首先介绍了WiFi技术的基本原理，WiFi的关键技术，WiFi的协议和WiFi技术的结构，接着介绍了基于H.264标准的视频压缩方法，给出了H.264的编码和解码过程，并详细介绍了μC/OS-II操作系统的移植过程和任务调度机制以及任务数据通信，然后设计了以MSP430F5438微处理器、WiFi无线传输芯片LTM22和以太网芯片W5200为核心构成的井下视频无线传输系统，给出了系统硬件总体结构以及各单元电路的具体设计方案。最后在此硬件平台上实现了μC/OS-II在MSP430F5438上的移植，编写了基于μC/OS-II的API接口函数和底层硬件驱动程序以及该系统的应用程序。本论文最后进行了系统实验分析。实验结果表明系统的硬件和软件能够稳定运行，可以正常收发数据，有效地解决了传统井下视频传输系统中存在的问题，达到了预期目标。
[Abstract]:With the development of economy, the demand for coal in our country is increasing day by day. The growing scale of coal mining means that more and more miners need to work underground. At present, most mining enterprises adopt the method of wired transmission. Once a mine accident occurs, the cable is destroyed, the video transmission will be interrupted immediately, and the rescuers in the well will not be able to understand the situation of the trapped people in the well in time. Influence the decision and progress of rescue. Therefore, it is necessary to establish a complete underground video wireless transmission system. WiFi technology has the advantages of high speed, high reliability, good flexibility, long transmission distance, strong anti-interference ability and so on. At the same time, easy to integrate with the existing wired Ethernet network, the cost of networking is lower. Therefore, this paper applies WiFi technology to underground video transmission system. This paper first introduces the basic principle of WiFi technology, the key technology of WiFi protocol and the structure of WiFi technology, then introduces the video compression method based on H.264 standard, and gives the coding and decoding process of H.264. The transplanting process, task scheduling mechanism and task data communication of 渭 C / OS-II operating system are introduced in detail. Then, a downhole video wireless transmission system is designed, which is based on MSP430F5438 microprocessor WiFi wireless transmission chip LTM22 and Ethernet chip W5200. The overall hardware structure of the system and the specific design scheme of each unit circuit are given. Finally, the porting of 渭 C / OS-II on MSP430F5438 is realized on this hardware platform, and the API interface function based on 渭 C / OS-II, the underlying hardware driver and the application program of the system are written. At the end of this paper, a systematic experimental analysis is carried out. The experimental results show that the hardware and software of the system can run stably, can send and receive data normally, effectively solve the problems existing in the traditional underground video transmission system, and achieve the expected goal.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.8

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