| The current safety of coal mining is very severe. Accidents like coal gas leaks,flooding, collapse and coal dust explosions happen frequently under mine. It is difficultto master the distribution of underground workers in real time. As a result, it slowsdown the speed of disaster relief. Researches have important practical significance oncoal mine personnel positioning system which is in the area of early warning, rescuingpersonnel and making escaping routes.The current personnel positioning system has experienced from microwave beaconsystem, personnel detection system with radio frequency identification technology tothe personnel attendance system which is based on Zigbee. Its internal technologies aredeveloped from ultrasonic positioning technology, infrared positioning, and radiofrequency identification technology to wireless sensor networks. Now most of domesticpersonnel positioning systems are using the radio frequency identification technology.The system has greater power consumption. A few of the positioning systems useZigbee network based on signal strength and arrival angle. As a result, they have manypositioning error and low-power, so they are useless. The paper researches personnelmine safety and other aspects choosed by Zigbee platform, which is based on TOF (timeof flight) front-end systems for underground research. The system with real-timelocation tracking, identification and other functions can achieve high efficiency andsafety of underground work.The paper researches on Zigbee pro network technology and related protocolstandards. It also analyzes how to make the network be low-power, low-speed, andself-networking. It can make up short transmission distance with high powerconsumption and other defects of RFID, wifi and other wireless. By comparied withother positioning systems, developmenting platform of JN5148is designed for front-endsystem to locate the exact personnel. The design of hardware includes the sub-stationstructures of underground personnel positioning system, the reader part, the auxiliarysection and marked card reader. It also contains the host computer for data transfer partof CAN bus. It analyzes the characteristics of personnel positioning algorithm andapplications. It ultimately determines to improve the located calculation of undergroundpersonnel bouding-box positioning algorithm which is based on TOF. Eclipse platformis designed on software, which is based on NXP’s Zigbee pro stack to design module workflow of the Zigbee.The paper verifies the effectiveness of the positioning algorithm. It designes theapplication layer protocol based on CAN bus. It carries out the communication betweensubstations and the readers by building hardware platform. After debugging, the systemcan achieve personnel positioning and communicate with sub-stations. The result isstable. It can meet real-time requirements to achieve the desired goals. |
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