Design Of Mine Underground Personnel Positioning System Based On CAN Bus

With the sustained and rapid development of economy in our country, thedemand is increasing for a variety of mineral resources, especially coal resourcesas one of major energy minerals. The coal industry of our country practices aremainly underground mining, our country have attached great importance to safetyproduction, and have established six safe haven systems-monitoring andcontrolling, personnel positioning, communication and liaison, emergency refuge,air pressure and self-rescue, water and rescue. Among them, the personnelpositioning system is integrated application with a set of underground personnelmanagement, tracking, disaster aid and safety warning. However, due totechnology divorced from actual situation and poor stability of the equipment,mine personnel positioning system still has many problems. Therefore, in-depthstudy of mine underground personnel positioning system still has importantsignificance.This article has carried on research to existing mine underground personnelpositioning system deeply, combine with the actual situation of China’s coalindustry, and design a mine underground personnel positioning system based onCAN bus. The system uses RFID technology for front-end information collection,CAN bus as the core network for data transmission, underground communicationsub-station communicates with the host computer via Industrial Ethernet. CANbus as a key technology plays a connecting role in the system, which ischaracterized by simple structure, real-time, high reliability. The automaticarbitration mechanism of CAN bus is especially suitable for mine undergroundpersonnel positioning system.The design of the whole system is divided into three modules, radiofrequency identification module, the sub-station module of card reader andEthernet-CAN Protocol Conversion Module. The personnel identity information has been received via the RF transmitter, the sub-station of card reader loadsposition and time information, and transmits via the CAN bus network to theEthernet module, location information as an Ethernet signal in this module hasbeen sent to the host computer, then the system completes personnel positioningfunction. The system also includes a host computer for underground personnelscheduling, alarm and other functions. For three sub-modules to achieve thefunction, the system uses a rich peripheral interfaces, ARM Cortex-M3as thecore, STM32microcontroller as the main control chip. RF chips use nRF24LE1and nRF24L01+chip, nRF24LE1has a high level of integration, integratedenhanced51core controller. Ethernet chip uses ENC28J60which has a high levelof integration, complete its configuration through the SPI interface. After a lotsof experimental tests, the system can meet the demand of design, and the systemhas a good real-time performance and stability.