Research On Network Topology Of Wireless Building Safety Monitoring System

With the development of urbanization in China,more and more buildings will be built in cities,and building disasters are common.In order to alleviate the hazards of building safety accidents to household life and property safety,the network topology research of intelligent building monitoring system has become a research hotspot.In order to study the network topology of intelligent building monitoring system better,a wireless building safety monitoring system based on ZIGBEE network and new tree topology is designed.The system is mainly composed of terminal node module,routing node module,coordinator module and upper computer.All three modules use CC2530 chip as the core component of sensor communication.The terminal node and routing node are composed of temperature and humidity,CO sensor chip,NEO-6M GPS positioning chip,power supply circuit and signal circuit.They mainly complete the collection and transfer of various information.The difference between the hardware structure of the coordinator and the routing node? the terminal node is that there is no sensor module.An RFX2401 chip is extended on CC2530 chip to increase its usage range.The coordinator module mainly completes the information interaction with the host computer.This thesis focused on the network topology,analysed and designed the sending and receiving of data between terminal node module,routing node module and coordinator module,designed a data packet communication format based on Zig Bee protocol,and realized the orderly acquisition and processing of different sensor data and GPS positioning information.The structure of traditional tree topology with the limitations of the link failure was found modified in the research of network topology,the research and design of the dual link network topology model,could significantly compensate for defects in the general topology tree network.Finally,a set of reliability algorithm was designed to improve the reliability of the network by generating alternate routes,and the effectiveness of the dual-link tree network topology was verified by MATLAB simulation experiments.The wireless building safety monitoring system and software module are tested.The system not only collects the environmental parameters such as CO concentration,temperature and humidity in real time,but also has the functions of GPS positioning,time information,node data transmission and message transmission.The real-time dynamic situation of each sensor and route can be observed in PC interface.When point failure occurs,the host computer displays alarm in time,and sends out alarm at the fault node to alert the people around it.Finally,the system using SPMM topology is compared with the test data of the DPMM topology.The results show that DPMM has obvious resistance to link failure and can significantly improve the reliability of the system.