Design And Implementation Of Postioning System Based On WiFi Technology

With the development of WiFi technology and Wireless City, WiFi technology is widely used in various industries. Similarly, in location-based services market, the demand for location-based services grows rapaidly. For example, the health care industry, emphasis on patient care tracking, anti-steal the baby delivery room, expensive medical equipment monitoring and control,shopping cart positioning, customer spending habits of collection; prison inmates focus tracking; travel route navigation, real-time location of inquiries. As the GPS satellite positioning, it can provide precisely positioning only where relatively open, none high-rise buildings,can't be used indoors and it has higher power consumption. Therefore, in intensive indoor positioning targets,positioning system based on WiFi technology become the best choice.Through the WiFi network location, you can make up for GPS in the construction-intensive or indoor applications, restrictions and expand the application of location-based services industries and range, and improve positioning accuracy, reduce deployment costs, improve equipment utilization, enhance rescue capabilities to respond to emergencies has important social significance.Here we talked about the WiFi technology and learn the basic principles, the underlying communication protocol and web-based wireless positioning technology, focusing on analysis of the postioning technology based on statistics experiences of RSSI, Probabilistic model-based positioning strategy. Based on above knowledges we designed and implementaed the function of this positioning system, including client and server-side applications. Mainly include:client-side modules, positioning modules, graphic display module, the system login module, the user management module, device management module. And implemented the various modules and the entire system design features by coding. In the lab environment to test the system, and designed test cases are used in the lab environment and a brief analysis of the results. The final chapter briefly summarize the obtained results and pointed out that the function not yet been achieved, and make a future based on the research results of this subject.