Design And Implementation Of Indoor Positioning System Based On WLAN

With the continuous development of mobile communication technology and the increasing demand of new business, Position calculation(Based Services LBS) is becoming more and more popular. Buildings is human activity and stay in the most intensive place, so people urgently need the Position calculation of indoor environment, navigation and monitoring and management services, such as intelligent services, how to provide a good indoor positioning service has become a hot issue in recent years. On the other hand, the development of wireless local area network technology in the end of twentieth Century is becoming more and more integrated into people's lives. Wireless LAN is the product of computer network and wireless communication technology. It uses radio frequency transmission technology to provide wireless broadband access services. It solves the problem of cable network routing. It breaks the limits of broadband access. It can meet the needs of mobile data communication. The production and development of data communication are not only meet the needs of high efficiency, high quality, high bandwidth and low cost, but also provide new opportunities and directions for indoor positioning.In recent years, people have developed a variety of indoor positioning technology through various means, and the indoor positioning technology based on WLAN has become a hot spot in recent years. In this paper, the research and implementation of the technology were carried out and the following several works were completed:1. This paper presents a system for supporting multiple users, including mobile terminal display and background server computing and processing of indoor positioning system design and implementation, it is convenient to make a number of users through the mobile terminal to locate its position and view other interested users.2. The system in order to solve the complex and changeable indoor environment caused by the instability of the wireless signal intensity caused by the positioning accuracy of the problem, the use of an accurate positioning algorithm based on Calman filter algorithm, and on the basis of the algorithm proposed a unique signal fingerprint data matching strategy.3. By considering the actual situation of indoor positioning, this paper puts forward a method to maintain the positioning accuracy of indoor positioning system in some special situations, and to design a specific response mechanism and algorithm strategy. These strategies and mechanisms include ensuring that the user's position monitoring mechanism is not lost in the complex motion state, and that the accuracy of the received signal strength is changed without loss of self correction Calman filtering algorithm and the secondary matching strategy when dealing with the position matching failure.