Research And Implementation Of Distributed Indoor Localization System Based On Multisource Fusion

With the rapid development of science and technology,location-based services have great commercial value in many fields such as constructing intelligent city and promoting commodity information.As a key technology of location-based service,indoor positioning has become a hot research topic in recent years,and there are many kinds of indoor positioning technology routes based' on single mode in the market.However,a single positioning technology can not meet the needs of high accuracy,universality and low cost,which is not conducive to the promotion and application of positioning technology.It is urgent to study the indoor fusion positioning technology framework based on cloud architecture in multi-source fusion mode.On the basis of investigating the current research situation of indoor positioning technology,this thesis focuses on the research and realization of indoor positioning system based on Wi-Fi/BLE/geomagnetic fusion,and puts forward the Wi-Fi/BLE/geomagnetic Fusion strategy based on motion state.Based on the advantages and disadvantages of barometric pressure and Wi-Fi in floor recognition,the thesis optimizes the floor recognition algorithm based on Wi-Fi fingerprint.The complication of interior building and the enlargement of positioning range will greatly increase the computational complexity of real-time positioning,and the traditional centralized system structure can not satisfy the complex indoor building structures and the application demand of high concurrency.Distributed system as the mainstream method to solve the problem of high concurrency and massive computation,this paper designs distributed indoor positioning System architecture based on the common architecture of existing distributed system,and designs and realizes distributed indoor location routing strategy according to the difference of coverage range of different location servers.The dissertation studies and realizes the distributed indoor localization system based on multi-source fusion and evaluates related performance,including positioning accuracy,positioning delay and load under distributed architecture.Through the test and analysis of the experimental results in this paper,in the indoor environment where Wi-Fi hotspots are deployed,the Wi-Fi/BLE/geomagnetic multi-source fusion indoor positioning system designed and implemented in this paper has good positioning performance and can meet indoor positioning requirements.At the same time,the system architecture design based on distributed ensures the usability,reliability and expansibility of the positioning system,which can meet the increasing demand of users and has good commercial value.