Design And Realization Of Localization System Based On Multi-sensors

While the era of Mobile Internet has come, network is extended from traditional desktop computers or lap-tops to mobile terminals. Since that, location-based service (LBS) is more and more attractive for the characteristics that mobile terminals are always moving. In recent years, with the development of information technology, especially the development of pervasive computing and network, accuracy and scope of localization technology is also improved. Localization technologies for outdoor such as the Global Positioning System (GPS), the most well-known position system for outdoor, have been made a great successful application in the world. However, with the development of society, people require not only outdoor but also indoor that can get more accurate location information. What’s more, people always like to move between indoor and outdoor with mobile terminals so that they would like to require smooth scene changing for better using experience. On the other hand, with development of science and technology there are more and more sensor devices can be used in localization, for which method of multi-sensors for localization could be possible. Opposed to single sensor, multi-sensors will be able to obtain higher positioning accuracy. For the background above this paper present a whole space localization system based on multi-sensors. This system will fuse the advantages of localization technologies of GPS, GSM localization and Wi-Fi, Bluetooth and other kinds of sensors, and be used for whole space of indoor and outdoor.Firstly, this paper summarizes the existing indoor and outdoor positioning technologies as well as map service, and then describes software platforms and technologies which are related in the paper. Furthermore, the paper combines Wi-Fi and Bluetooth for indoor position to improve accuracy and robustness, and the math model of Bayesian Filter and concept of Simulated Annealing are involved in the localization algorithm. Subsequently, the prototype system of whole space localization is designed and realized which is based on multi-sensors such as GPS, GSM localization, Wi-Fi, Bluetooth and other kinds of sensors. The system consists of three parts that are the prototype client, middleware and back-office location engine. Especially, this paper focuses on the design of middleware, and then elaborates the principles and architecture of WiMap location engine and the prototype client. Finally, in this paper the functions and stability of the prototype system is tested, and the results shows that most of the functions can achieve the desired results and the system can still give rapid response to the users in the face of multi-users request. However, there are also some problems in some of the components of the system which can be improved in the future. In this paper, it seems that there are huge demands for applications and a broad prospect for market with the whole space localization system based on multi-sensors for both indoor and outdoor. Moreover, the prototype system which is researched and realized in this paper is valued and instructive for the related study field.