Reaserch And Deasign Of Supervision And Alarm System For Urban Utility Tunnel

Utility tunnel is an important part of urban infrastructure,supervision and alarm system is an important system to ensure the safe and stable operation of the utility tunnel.Beacause of the protection of the corridor and the safety of people in the tunnel,and energy saving,the traditional supervision and alarm system cannot meet the needs of fine management of the tunnel more and more.Frequent accidents in the tunnel caused,operating energy consumption is high,it is urgent to improve the overall performance of the supervision and alarm system.A safe and efficient supervision and alarm system can guarantee the safety of the utility tunnel and the person.It also have important practical significance in reducing the cost of the project and the cost of operation and maintenance.First of all,the functional requirements of the system is put forward based on the study of the function of the traditional supervision and alarm system and its implementation method,and the performance of the supervision and alarm system is improved by implementing the active and passive personnel positioning system.Secondly,the wireless positioning technology and algorithm is researched prioritly which is suitable for utility tunnel,the RSSI range positioning technology is selected which is based on signal strength,and the least-squared method based on active positioning and the mean variance positioning algorithm based on the small-scale propagation effect of passive positioning is used through analysis and simulation.Thirdly,to build a new integrated Utility tunnel supervision and alarm system architecture,a wireless positioning system based on ZigBee technology is uesd to design a new positioning security communication integrated subsystem,TI(Texas Instruments)production of CC2430 / CC2431 chip is selected as the core hardware of the system,and related peripheral hardware is designed,while the positioning program is developed by using the IAR software platform.Finally,the positioning effect of the new positioning security communication integrated subsystem is verified by using analog experiment method.The experiment shows that the positioning accuracy of the active personnel in this system can reach 1.5m,and the positioning accuracy of passive personnel can reach 5m,which fully meets the project needs of the Utility tunnel.At the same time,the extended application and energy-saving effect of the system in the Utility tunnel are analyzed theoretically,which proves the broad application prospect.Compared with the traditional supervision and alarm system,the new supervision and alarm system architecture is more concise.The wireless positioning system based on ZigBeetechnology can realize the five system functions,that is intrusion alarm,personnel positioning,electronic inspection,wireless communication and entry control in the traditional system.With the high accuracy of 1.5m in active positioning and 5m in passive positioning,the new supervision and alarm system improves greatly the level of operation,maintenance and management of the utility tunnel and reduces the operation cost.Meanwhile,the power consumption of patrol inspection is reduced by 79.4%.