基于wifi的定位技術應用研究
[Abstract]:Positioning technology based on WIFI, which can solve the problem that GPS can only carry out outdoor positioning, is a new technology in the field of positioning. With the rapid development of indoor positioning technology in recent years, it has been widely used in medical industry, public security industry and tourism industry. The thesis focuses on indoor positioning technology, indoor positioning algorithm, indoor positioning correction algorithm and indoor and outdoor positioning seamless switching technology. Firstly, the main indoor positioning technology is listed, and the characteristics of these technologies are compared. Finally, the indoor positioning technology based on WIFI is selected. Then in the selection stage of indoor positioning algorithm, the triangle algorithm, fingerprint database algorithm and scene analysis location algorithm are analyzed from the aspects of location accuracy, speed, advantages and disadvantages, and applicable scenes. Finally, triangle algorithm is used as the main algorithm of text. Considering the time-varying of RSSI value, the filtering methods of Gao Si filter, Bayesian filter and Kalman filter to RSSI value in data acquisition stage are discussed. According to the idea of RANSAC algorithm, a quadratic correction algorithm is proposed, which corrects the deviation from the two dimensions of distance and direction, and improves the positioning accuracy. Finally, in order to expand the application scope, by controlling the opening and closing state of GPS positioning module and WIFI positioning module, an indoor and outdoor seamless switching strategy is proposed, which combines the two positioning technologies. Thus greatly improve the service life of positioning equipment. Based on the above work, an indoor positioning software based on WIFI is designed. The whole structure of the software is analyzed, and the indoor positioning software is realized by using triangle algorithm and quadratic correction algorithm, combined with the seamless switching strategy of indoor and outdoor positioning.
【學位授予單位】:沈陽工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN92
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