| Statistical analysis showed that national coal mine gas accident accounted for 70 per cent of the total number of mine accidents. Therefore the mine rescue system focused on gas accident relief management, the main features of this system are: the coal mine gas data which by collection monitoring, transmission and processing; on the gas accident occurred for early warning and rescue support. At present, most of the coal mine monitoring system using wired and fixed network of sensors which need to mine laid communications line to pass monitoring information. But in the production process, the high requirements will be required for changing mine structureon and the communication line extension and maintenance . Once the communication link fails, the entire flow monitoring and control system may paralysis, seriously affecting the reliability of the system.This paper introduces wireless early warning network Coal Bed Methane Development and status at home and abroad .Next to the topic discussed in the coal mine gas wireless alert network components and characteristics, and depending on the system function on the entire system partition Depending on the system partition can die embody this system than is currently the big advantage to using the system, namely: Wireless, high speed, low power consumption, small size, etc.Coal mine gas wireless alert network is primarily used by ZigBee wireless ad hoc networks and Ethernet (IEEE 802.3) cable network. The network can cover the entire front end of the building of coal mine, ZigBee network data collection and transport, back-end by Ethernet major data transmission backbone channel.As one of the signal system core operations and processing unit that carries data sampling, operations analysis, output is displayed and data communications, and other various tasks. Use a programmable logic device FPGA, its parallel structures, low power, processing speed, and other advantages of this design completed in line with the basic ideas... |
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