Research And Implementation Of The Location Algorithms And Fireman Positioning System Based On ZigBee

As the city grows,the risk of fire is increasing.The intelligent fire control system based on Internet of things technology can solve the problem of low accuracy and high cost of traditional fire-fighting system.But in the face of the complex fire scene,the safety of firemen still cannot be guaranteed.During the fire rescue,the scene is complicated,the firemen can only grope rescue,and the efficiency are decreasing;when the firemen in the fire,they may be in danger at any time.With the development of intelligence,the real-time determination of location of firemen can improve the efficiency of fire rescue and the protection of personal safety.Therefore,putting forward the Research and Implementation of the location algorithm for firemen based on ZigBee can not only realize wireless data transmission,it also can achieve firemen position,and it is more convenient for the firemen to improve the efficiency of rescue and safety of firemen.First of all,this paper introduces the wireless positioning algorithm.And through the comparative study,the advantages and disadvantages of different algorithms are obtained.Considering the situation of localization algorithm and single RSSI localization algorithm low accuracy,the paper proposes a new improved location algorithm,which is weighted centroid of four anchor nodes based on RSSI Location algorithm named WCFR.In view of the traditional localization algorithm three circle does not have the point of intersection,the algorithm introduced the geometric centroid algorithm,and joined with the weight of the distance.In order to further improve the accuracy,this paper increases the number of anchor nodes on the basis of the original three anchor nodes,and using the above method to form four weighted centroid coordinates.Finally,by solving four morphological heart obtained the coordinates we can estimate the unknown nodes.In order to verify the feasibility of the WCFR algorithm and the positioning effect,this paper uses Matlab to simulate the three kinds of localization algorithms,and the simulation results are compared to verify the effectiveness of the algorithm.After that,this paper presents the design framework of firemen positioning system to construct a small fire positioning system based on ZigBee technology.The system design is divided into hardware and software application software.The nodes of hardware system use CC2530 chips of TI Company,and using the IAR programming software to write three types of procedures in the ZigBee protocol stack.The anchor nodes transmit RF power value,unknown nodes receive and transmit to the coordinator node,and coordination node receive data and is connected to the PC and so on.Positioning application software is developed by using C#language on the VS2010 development platform.Software achieves the serial data read,and implements the positioning algorithm and unknown nodes in the PC software display.Finally,when finishing the firemen positioning system based on ZigBee technology,this paper carries out the actual test on the actual environment by the small wireless positioning system.Some experiments result prove the availability of the system.At the same time,this paper puts forward the current shortcomings of the positioning system and the next step should to carry out.