Barometer And WiFi Based Fusion Floor Localization Algorithm

With the rapid development of mobile Internet and the widespread popularity of mobile smart devices,location-based services(LBS)have been inseparable from people's daily lives.Because the Global Positioning System(GPS)cannot meet the explosive growth of indoor location requirements,new and more effective indoor positioning technologies are urgently needed,especially in multi-floor buildings.Due to the complexity of the multi-floor environment,most of the floor positioning methods based on signal strength fingerprints are seriously blocked in signal propagation,have obvious multipath effects,and have limitations such as high equipment requirements and low positioning accuracy.With the development of MEMS,the types and accuracy of sensors built into smartphones have increased,making it possible to locate floors based on barometric pressure sensors.Based on the study of the characteristics of Wi Fi and air pressure in multi-floor environment and the analysis of floor positioning technology at home and abroad.The study proposes a floor positioning algorithm Wi-BL based on barometer fusion Wi Fi fingerprint,and the main work of this article includes the following aspects:(1)Improve the Wi Fi floor location algorithm.The study analyzes the characteristics of Wi Fi signals in multi-floor environment.Based on the traditional Wi Fi fingerprint floor location algorithm,the FLD linear classifier algorithm is proposed to improve the Wi Fi fingerprint positioning accuracy in multi-floor environments.(2)Acquire atmospheric pressure data through intelligent sensing technology to avoid setting fixed pressure reference stations and reduce deployment equipment costs.(3)A switching mechanism is proposed to perform seamless switching between the Wi Fi floor positioning module and the air pressure floor positioning module,so that the Wi-BL algorithm ensures a high positioning accuracy.(4)Realize the Wi-BL system in a real multi-floor environment.The system can provide positioning services with higher floor positioning accuracy.With only one air pressure reference station,the Wi-BL system floor positioning accuracy reaches 90%.