Research And Implementation Of Indoor Positioning System Based On UWB

Nowadays,after many years of development,positioning technology has made great progress,especially in the field of outdoor positioning technology.GPS as the representative of the outdoor positioning technology has been able to provide people with a better services of location,For example,map products of Google,Baidu and other company which can provide destination navigation to help the user find goal,such as food,cinema,takeaway,hotels,etc.People have a good experience in location services.But,due to the outdoor positioning technology has some limitations in the indoor environment and the demand of indoor location service is more specific and meticulous,so outdoor positioning technology can’t provide excellent experience to user in the indoor environment.At present,there are a variety of indoor positioning technology,such as:Bluetooth,infrared,WIFI and so on.But,when user has higher requirements on the stability and accuracy of the positioning,UWB has obvious advantages and well meet the needs of users.Therefore,this paper established UWB indoor positioning system in the actual scene based on the UWB technology to achieve high precision,high stability positioning.This paper discussed the actual situation and hardware facilities of the system,studied the dynamic and static data and designed the overall framework of the system in detail,including demand analysis,architecture design,functional analysis and database design.The main function is visualization of positioning results,management of tag and base station,playback of historical track,etc.Finally,this paper collects the positioning data of the system,and uses the evaluation index of positioning accuracy to evaluate the system.The factor which can affect accuracy of the positioning includes multipath effect,signal attenuation,non line of sight,etc.But,the density of the base station is high and the multipath effect are less affected by the sight distance in the real scene,the positioning accuracy is compared under two kinds of conditions:non line of sight and sight distance.Through the comparison of several sets of data,it is found that the positioning accuracy is about 0.2m in line of sight and 0.6m in non of sight.What’s more,the system prove to be stable by CFD.Finally,the work of this paper is summarized and prospected.In this paper,UWB indoor positioning system is established and the 2D real-time visualization is realized.The positioning accuracy is reduced by environments of the non line of sight and other reason,the average positioning accuracy reaches 0.4m,The average positioning accuracy reaches 0.2m in line of sight.And the stability of system is excellent.