采用ZigBee節(jié)點(diǎn)網(wǎng)絡(luò)的室內(nèi)定位系統(tǒng)研究
[Abstract]:With the rapid growth of data and multimedia services, the demand for positioning and navigation is increasing, especially in complex indoor environments, such as airport halls, exhibition halls, warehouses, supermarkets, libraries, underground parking lots, etc. It is often necessary to locate the location of the mobile terminal or its holder indoors. Compared with outdoor environment, indoor positioning is limited by the conditions of positioning time, positioning precision and complex indoor environment, which results in the relatively perfect outdoor positioning methods can not be effectively applied to indoor environment, so the precision of locating is high. The indoor positioning system, which has good robustness, simple implementation and low cost, has become a hot spot in the industry. After expounding the research status of indoor positioning and the common indoor positioning system, the wireless sensor network based on ZigBee is selected to realize the development of indoor positioning system. After setting up the hardware and software platform of the indoor positioning system, by comparing several commonly used indoor positioning methods, a convenient and easy method based on the received signal strength indication (RSSI) information is selected to study the system. In order to solve the problem that the location error is too large after a certain distance in the process of RSSI ranging, a sub-region weighted centroid algorithm is implemented, which divides the location area into several sub-regions to realize the short distance location. The sum of reciprocal distance of nodes is used to replace the reciprocal of distance sum as weight, and the coefficient of weight is modified to make full use of node information. The simulation results show that the accuracy of the algorithm is 25% higher than that of the original weighted centroid algorithm, and the robustness of the algorithm is better than that of the original weighted centroid algorithm. Because the ranging error caused by indoor complex environment is inevitable, the performance of localization system using traditional localization algorithm is limited. The fault tolerance and nonlinear mapping ability of multilayer feedforward (BP) artificial neural network are also used to further improve the location performance. The simulation results show that the average positioning accuracy of the network is 0.21 m in the region of 6m 脳 3m. In addition, the particle swarm optimization algorithm (PSO) is used to optimize the initial weights and thresholds of the network. The experimental results show that the accuracy of the improved algorithm can reach 0.16m, which is 23.88m higher than that of the common BP neural network.
【學(xué)位授予單位】:上海師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN92
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