Research On High Precision Seamless Positioning System Indoor And Outdoor Based On BD And UWB

With the rapid development of AI,industrial automation and Internet of things,there are higher standards for location-based services.Indoor and outdoor high-precision seamless positioning has become the focus of current research.Up to now,indoor positioning and outdoor positioning have made some achievements,but they are in a state of independent development.A high-precision indoor and outdoor seamless positioning system based on Beidou（BD）and Ultra Wide Band（UWB）is designed in this paper,user can locate anywhere with the system.The main researches are listed as follows:First of all,a lot of researches have been carried out on the existing indoor and outdoor positioning technology,and analyze their strengths and weaknesses.BD is used for outdoor positioning,UWB is used for outdoor positioning.The median mean filtering method is used to filter the original observation distance data,which effectively suppressed the influence of multipath effect,greatly improved the accuracy of ranging,and ensured the accuracy of indoor positioning.In the transition area of indoor and outdoor,the positioning signal will be blocked to different degrees,which leads to the sharp decline of the positioning performance of the single positioning system.In this paper,a lot of research is done on the data fusion technology in the seamless localization of this region.BP neural network is used to fuse the data of BD and UWB to overcome the instability of single positioning system.The algorithm avoids the complex mathematical model in the combined positioning system,and has high positioning accuracy and strong robustness.Finally,combined with the above algorithm,a seamless positioning system is designed,which includes mobile tag,ultra wideband positioning base station,mainframe monitor system and so on.The results show that the system has high positioning accuracy,wide positioning area and good application prospect.