Design And Implementation Of Video Transmission System In Underground Coal Mine Based On WiFi Technology

With the development of economy, the demand of China’s coal is growing with eachpassing day. The scale of coal mining is more and more big, which means more and moreminers will work in underground. Recently, Most of the mining enterprises adopt the way ofcable transmission, once accidents occurre, wired cable is damaged, video transmission willbe interrupted immediately, and then the rescuers inoue do not know the undergroundpersonnel trapped in time, it influences the decision and progress of rescue. Hence, It isnecessary to develop a complete set of underground wireless video transmission system. WiFitechnology applicates in underground wireless video transmission system has a fast speed,high reliability, good flexibility, long transmission distance, strong anti-jamming capability,and it is convenient to integrate with the existing wired ethernet networks, an the network costis lower. Therefore, the WiFi technology is applicated in the underground video transmissionsystem in this paper.Firstly, this paper introduces the basic principle of WiFi technology, the key technologiesof WiFi, the protocol of WiFi and the structure of WiFi technology, then video compressmethod based on H.264protocol were introduced, and the encoding process and decodingprocess of H.264are given. And this paper introduces the migration process of μC/OS-IIoperating system, task scheduling mechanism and task data communication in detail. Then theauthor designed underground mine wireless video transmission system whose corecomponents were MSP430F5438, WiFi wireless transmission chip LTM22and ethernet chipW5200. And specific design strategies of overall hardware structure and each electronicmodule were also illustrated. Finally, μC/OS-II was transplanted to MSP430F5438onhardware platform and API interface functions, fundamental hardware drive and applicationprograms were generated by author.Eventually, the thesis has carried on the experimental analysis of the system. The resultsof experiment demonstrated that hardware and software can run stably, data can transmitteregularly. Therefore, the traditional problems of underground video transmission system weretackled effectively which achieved original design objective.