The Development Of An Original Multi-Media Wireless Network For Underground Works

In recent years, the increasingly rapid development of economy in our country needs more and more energy resources. Coal is the basic resource of the whole energy industry and chemical lines, and the requirement for it is steadily on the increase. Because of the unceasing expansion of coal mining scale, more and more workers need to do the down-hole operation. For this reason, the construction of a set of communications platform with complete functions becomes especially important. The integrated down-hole communications system provides support for daily life and personal safety. However, at present, the integrated communications system that has the multifunction of voice communications, image transmission, collier tracking and attendance recording, is not perfect. It is mainly because the specialty and complexity of the down-hole environment.According to current condition and practical requirements of the down-hole communications, the paper shows a kind of digital integrated wireless local area network (WLAN) for mine which is based on IEEE 802.11 protocol. This system improves the safety and productive efficiency of the mine. Based on the above network, the terminal system is designed. The paper put emphasis on the following aspects:(1) The down-hole communications system is an integrated network, which combines wired and wireless local area networks. Therefore, the paper firstly introduces some related theories, such as the local area networks working process and principle, propagation property and protocol standard.(2) Multiplexing parts of data transmission module from the integrated down-hole communications system is constructed. The redundancy design is performed.(3) VIOP theory of the voice communication system, internal structure and operation process of the VIOP radio, and VIOP protocol are introduced. VIOP server configuration is proposed.(4) The development of the video monitoring system is introduced. Theory and composition of the system are analyzed. The solution to down-hole monitoring system construction is raised.(5) The whole hardware framework of the solution to collier tracking and attendance recording system is introduced. Central hardware is designed. Tracking theory and software implementation of the collier tracking system, whole hardware framework of the solution and realization of every hardware module, are introduced Based on WLAN protocol, the paper proposed the design and implementation solution to the down-hole multimedia wireless communications network. The system can avoid redundant projects of the three networks: voice communications, image transmission, collier tracking and attendance recording. The system raises the utilization rate of the communications lines, saves the construction costs and provides the comprehensive down-hole services. The wireless network has the advantages prior to traditional down-hole wired networks, and proposes the feasible solution to the development of the digital mine.