Investigation On Automatically Positioning And Guiding System Based On Wireless Sensor Network For Large Exhibition Hall

Based on the large exhibition hall Guangdong Science Center indoor positioning system requirements, proposed large-scale wireless sensor network based positioning and intelligent guide system pavilions overall objective overview of the current domestic and international indoor positioning and intelligent guide research status. On this basis, analysis and comparison based on RFID technology, Wi-Fi technology, Bluetooth and Zigbee-based technologies such as indoor automatic positioning system program features. Control requirements analysis, this paper presents a research program-based on Zigbee wireless sensor networks and intelligent guide system automatic positioning. Under the guidance of an instructor, I work mainly for the following research:(1) access to a large number of relevant literature, according to the actual needs of users, to develop the system’s overall plan;(2) based on wireless sensor network positioning and automatic guided large exhibition hall set up system hardware;(3) System positioning algorithm design and test a large number of experiments and data analysis;(4) based on the Gaussian model height difference compensated RSSI MLE localization algorithm design and implementation. From the positioning principle, analyzes the power and signal propagation distance relationship models are discussed and the triangulation and trilateration maximum likelihood estimation method for calculating the three position coordinates the pros and cons, including the realization of the RSSI value of pretrcatment. Ranging computing and the destination node coordinates calculation algorithms. On this basis, in the MATLAB platform for simulation.(5) based on CC2430/CC2431ZDK ZigBee wireless sensor development kit CC2430and CC2431terminal node static dynamic real-time positioning terminal node repeated testing, the test results through a variety of test scenarios and simulation results of the comparative analysis, the following conclusions:a) within a reasonable layout of the pavilion reference nodes can reduce positioning errors, improve positioning accuracy;b) an equilateral triangle layout positioning accuracy is higher than under the squared circle layout and layout; positioning accuracy to meet the pre-set target, reaching0.5m;c) the same test conditions, the more the number of the reference node, higher positioning accuracy;d) multiple target nodes on the same network at the same reference node localization work interfere with each other.The main innovation lies in:(1) proposed and implemented a model based Showding triangulation positioning algorithm, simulation shows that the algorithm positioning error is less than other methods;(2) to achieve a height difference during positioning correction, simulation and experimental The results show that this method will help reduce the positioning error.