Design And Implementation Of Indoor Positioning And Navigation System On Mobile Device

With the increasing demand for indoor positioning services,how to provide users with simple,efficient and accurate indoor positioning services has become a research hotspot.Most relevant research focuses on the study of individual indoor positioning methods.In practical applications,indoor location services also need to provide users with supporting services such as map display,route planning,positioning,navigation,and floor switching.In response to the above problems,an office laboratory building of a university was used as the research object,and the functional design of the indoor positioning and navigation system and the selection of implementation schemes were the research focus to realize the indoor positioning and navigation system.Based on the design of the indoor map data structure,the office building map was digitized to generate indoor map data.The main functions and API interfaces of the map display module,positioning module,navigation module,and floor switching module of the system are designed to ensure the interchangeability of the underlying technology implementation scheme.The wireless AP positioning and pedestrian dead reckoning positioning are selected as the implementation scheme of the positioning module,the position weight is introduced to reduce the drift phenomenon of wireless AP positioning,and the Kalman filter algorithm is used to fuse the wireless AP positioning results and the pedestrian dead reckoning positioning results.Using the A-Star algorithm combined with the characteristics of indoor stratification,a hierarchical A-Star algorithm is proposed to realize indoor cross-floor path planning.Since most mobile smart devices do not have a barometer,a wireless fingerprint library and wireless AP positioning method are used to implement the floor switching module.During the user's navigation process,it monitors the user's location and perceives the user's status,and provides users with automatic route re-planning and floor switching services.The test was conducted in a university office laboratory building,and the test results showed that the performance of the system during the entire navigation process reached the expected goal.The system has reached a certain accuracy in positioning the user's position,but there is still a drift phenomenon.When the user walks to the stairway,the floor switching is automatically performed,and the current floor is switched when the user reaches the designated floor.