Research And Realization Of Data Processing Algorithm In BLE Indoor Positioning System

The rapid development of wireless network and mobile communication technology greatly promote the development of the regional oriented positioning technology,which makes positioning technology have more application prospects.The most representative example of positioning technology is indoor positioning,it has become a focus of research in positioning technology.Combining the engineering project,the Bluetooth Low Energy(BLE)technology is introduced into the implementation of indoor positioning system to design the whole scheme,build the hardware and software platform,study and realize of data processing algorithm.Based on the analyse of functional requirements of indoor positioning system,and combined with technique index,the paper designs the whole scheme and applied BLE technology in the indoor positioning system.which solves the limitations of traditional indoor positioning system.The system adopts ARM processor as the data processing unit,uses the Bluetooth module as data acquisition unit and takes the 4G communication module as remote communication unit.The paper introduces the distance measurement algorithm that based on RSSI signal value and four points positioning algorithm in order to get the coordinates of the object to be located.The paper uses the Gaussian filtering to deal with the value of RSSI firstly,then uses curve fitting to deal with the value of RSSI and produce the Formula of distance measurement model in order to improve precision of the system.And the system can get the three-dimensional coordinates of the object to be located by four points positioning algorithm after measuring the distance accurately.The paper constructs the hardware and software platform of the indoor positioning system on this base of the research of algorithm.The hardware platform is built by adopting ARM processor STM32F407 as the main controller,combining Bluetooth module NRF51822,4G module SIM7600 CE.The software platform uses KEIL as development platform,the main programs are as follows data acquisition program,data processing program,remote communication program.The system is tested from the function of data acquisition.data processing.remote communication.The results and data analysis show the Bluetooth Low Energy indoor positioning system can be able to achieve data acquisition function,data processing function,remote communication function and stereo positioning function.It can be applied to the engineering project of radioactive sources and monitor it effectively.The positioning accuracy of BLE indoor positioning can attain sub meter and meet the general demand of indoor positioning.