Design And Implementation Of Indoor Positioning And Evacuation Navigation System Based On Android

With the rapid development of economy in recent year,the building volume is becoming increasingly large and internal structure is also more complex.For large public buildings,in general,the daily traffic routes and emergency evacuation routes are setup separately and emergency evacuation routes are rarely used.Due to the use habits,insufficient safety awareness and other factors,when fires and other emergencies occur in the building,internal staff are unable to find the nearest exit in the shortest time and move to the outside in the shortest time.The in-depth study of indoor positioning technology has laid the foundation for personnel positioning and the evacuation to the nearest safe exit under emergency situations.This paper designs and implements the indoor positioning evacuation navigation system based on Android with the combination of WiFi fingerprint positioning technology and PDR pedestrian dead reckoning technology.Users can use the system to view real-time location in the building on the mobile phone and get to the route to the nearest exit in emergency circumstances.The main completed work is as follows:1.This paper surveys the research status of indoor positioning technology,introduces the technical points of a variety of indoor positioning technology and analyzes the research background and significance of indoor positioning technology.2.It introduces WiFi positioning technology and PDR pedestrian dead reckoning technology in detail.For WiFi positioning technology,it mainly expounds positioning principle based on propagation model and attenuation model and analyzes the positioning process and technical advantages of WiFi fingerprint positioning technology based on attenuation model.For PDR pedestrian dead reckoning technology,it elaborates positioning method,makes comparison with inertial navigation system and analyzes its advantage in indoor positioning.This paper also proposes a new indoor positioning algorithm with the combination of WiFi positioning technology and PDR pedestrian dead reckoning technology,which uses WiFi positioning to obtain the absolute position and remove the accumulated error caused by PDR pedestrian dead reckoning,thus resulting in the continuous high precision indoor positioning.3.In the indoor positioning evacuation navigation system design,it conducts system requirement analysis from technical feasibility,data processing function,positioning function and evacuation navigation function.And then it divides the system into three modules based on the analysis: positioning module,navigation module,map module.The positioning module is to obtain location with the use of new positioning algorithm proposed in this paper,the navigation module is to obtain the route to the nearest exit with the use of algorithm generated from adjacent matrix,and the map module is to analyze open street map generated by XML file.In the software interface of Android mobile phone,users’ real-time location display on the indoor map.Click on the exit button,then the system will display the route to the nearest exit.4.During the test,the system can accurately display the indoor location of users and give the route to the nearest exit.Therefore,the system has achieved the design requirements.