Research On WiFi Indoor Location Fingerprint Positioning Method Based On Android

With the rapid development of technology,wireless communication technology is becoming more and more mature,people are more and more demanding on location-based services.Outdoor positioning is usually used GPS or Beidou system technology.With years of development,outdoor positioning technology has matured.It can not receive the satellite signal because of the complex indoor enivronment and the walls of the shelter.Indoor positioning technology has been concerned.In this paper,the indoor fingerprint matching technology based on WiFi is one of the most widely used techniques in indoor positioning technology.First of all,this paper describes the research background and the status of indoor WiFi positioning technology,and illustrates the practical significance and importance of the research on indoor WiFi positioning technology.Furthermore,the research analysis indoor WiFi localization algorithms,such as K nearest neighbor,weighted KNN algorithm and so on.The WiFi signal will appear irregular attenuation in indoor propagation process because of the factors such as the complicated indoor environment and people,at the same time the blocking obstacles make the multipath effects.These factors will affect the accuracy of the positioning results.In order to increase the positioning accuracy,this paper proposes an improved WRKNN algorithm based on the above factors.According to the fluctuation of the WiFi signal,the mean value is used to reduce the influence of signal fluctuation on the positioning.The weighting method is used to increase the weight of large distance and increase the positioning accuracy.In the matching process,using dynamic K value and sort cut improvement measures to reduce the influence of the distance of the reference points,at the same time can reduce the required number of matching data,not only increase the positioning accuracy,but also reduces the system operation time and improve the efficiency of locating.Through the study of the traditional positioning technology,the traditional WiFi technology is based on client / server architecture.The data transmission between client and server will spend a lot of time,and the hardware cost is high.Mobile phones equipped with Android system is now popular.Therefore,using Android platform as the development environment and integrate the client and server together.This method not only reduces the cost,but also reduces the time required for the position.Finally,the design of the positioning system is completed by the code.The experimental results show that the error of the system positioning is less than 2.5m,and the accuracy is improved by 37.5% compared with the traditional positioning algorithm.