Research And Implementation Based On UWB Indoor Positioning System

In recent years,with the rapid development of navigation technology and positioning technology,people are increasingly dependent on location services.Indoor positioning technology has also received more and more attention from people.Unlike traditional outdoor positioning,its working scene is complex and the space is small.Therefore,for indoor positioning,suitable positioning technology and positioning system are needed to serve people.Traditional indoor positioning technologies,such as infrared,ultrasonic,Bluetooth,ZigBee,etc.,have their own advantages or disadvantages,while Ultra-Wide Band(UWB)technology has high transmission rate,large system capacity,and strong penetration.With the advantages of small transmission power and good performance in positioning,this paper proposes to use UWB technology to establish an indoor positioning system and realize the basic functions of indoor positioning.The main contents are as follows:Firstly,on the basis of studying the current indoor positioning method,combined with the characteristics of UWB signal,the end-to-end measurement of the positioning module system is proposed by using the two-way time-of-flight ranging method,and the ranging function is realized by hardware design.Secondly,based on the analysis and learning of the current localization algorithm,a joint algorithm based on least squares joint extended Kalman filter algorithm is proposed.The target is statically and dynamically located,and the motion detection method is designed.Simulation is carried out and the simulation results verify the effectiveness of the algorithm.Then,the hardware circuit and software system of the indoor positioning system are designed and implemented.Based on the hardware system of DWM1000 ranging module,the function of signal transmission and reception and ranging is realized.The software system uses QT and matlab hybrid programming to realize the visualization interface of positioning algorithm and positioning system,and collect measurement data for analysis in real time.Finally,the positioning system of this design is tested in the laboratory,and the antenna delay correction and error compensation are performed on the ranging function of the system.The ranging error is reduced to about 5cm,and it is still and dynamic.The target is subjected to positioning test,and the positioning result is sampled and analyzed.The positioning error in the static state is basically within 25 cm,and the dynamic tracking and positioning effect is good.The system test results show that the positioning effect of the ultra-wideband indoor positioning system designed in this paper is practical and effective.