Study On Wi-Fi Indoor Mobile Location Techniques Based On Directional Antenna

With the rapid development of information network technology and intelligent terminal,location-based services play an increasingly important role in social production practice.At the end of the 20th century,with the rise of wireless local area network,Wi-Fi positioning technology has become a hot topic in recent researches because of its large layout density,high communication speed,wide audience,simple network layout and so on.At present,the existing indoor Wi-Fi positioning technology is basically that mobile terminal users actively request positioning,the background server,through the corresponding positioning technology and algorithm,will return the positioning to the user's intelligent terminal.Although the Wi-Fi network is deployed in a large number of indoor environments,very few Wi-Fi networks are able to locate mobile terminals based on some positioning technology in their coverage area.Meanwhile,in the face of the complex terminals in the current market,the positioning technology and its universality of the algorithm is to meet higher challenge:the positioning algorithm need to overcome the different RF parameter of various terminals and to achieve the precise positioning of the target.Under this background,this thesis studies a Wi-Fi indoor mobile positioning technology based on directional antenna.Based on the hybrid positioning algorithm,a mobile AP with positioning function is designed and implemented.First of all,by reading a large number of the latest literature at home and abroad,the research status of the Wi-Fi indoor positioning system and positioning techniques are analyzed.This thesis introduces Wi-Fi basic knowledge,Wi-Fi indoor positioning techniques and distance-based positioning algorithm,and analyzes the influence of positioning accuracy according to the characteristics of indoor positioning.Finally,the mobile positioning technology is summarized.Secondly,based on path loss model indoor positioning,the indoor path loss model is briefly introduced.By analyzing the key issues of Wi-Fi indoor mobile positioning technology and the corresponding solutions are proposed.On this basis,an RSSD + AOA positioning algorithm is proposed.Through the analysis and simulation of the algorithm,the best path for positioning performance is found.As a result,the thesis proposes to set this algorithm as the core algorithm for the design of mobile AP.Then,based on the analysis of the demand of mobile AP,the relevant hardware platform and software platform are briefly reviewed.Through the research of antenna,the advantages and disadvantages of various types of antennas are analyzed and a directional antenna suitable for the requirements of this thesis is designed.It is proved that the parameters of the antenna are in line with the positioning requirements.On this basis,this thesis designs and implements the mobile AP positioning system architecture and the positioning program,further,the AP and antenna assembly are completed.Moreover,the typical indoor environments are selected.The positioning performance of the mobile AP and the algorithm is verified according to the positioning process for different mobile terminal equipment in different environments.The validity of the positioning algorithm and the practicability of the mobile AP are proved,and the positioning results are analyzed in detail.Finally,the research work of this thesis is summarized and a prospect to the future work is provided.