Design And Implementation Of Area Positioning System Based On UWB Technology

People's need for location information is growing by the day as the in formation age progresses.With the advancement of short-range and high-speed wireless communication technology,Ultra Wideband(UWB)technology is gradually gaining traction in the field of positioning.Its excellent ranging and positioning performance,as well as its ultra-high temporal resolution,enable very accurate position estimation in a variety of scenarios,allowing for a wide range of applications.Therefore,research on UWB positioning is of great interest.We design and implement a regional positioning system using UWB technology in this paper.UWB signals measure the distance between the positioning base station and the positioning tag,and the distance data is processed in real time by the tag integrated positioning algorithm,and the position estimation data is sent to the PC,where the tag's position and motion trajectory are displayed in real time by the display control software.In this paper,we use a Time of Arrival(TOA)positioning scheme that calculates the distance using the signal propagation time and then locates the tag.The precise calculation of the range value is a requirement for high accuracy positioning.The DW1000 ultra-wideband wireless transceiver chip is used in this paper to achieve accurate range measurement,which records the time stamps of UWB signal transmission and reception and uses the Double-Sided Two-Way Range(DS-TWR)method to calculate the distance between the base station and the tag.The DS-TWR method not only improves range accuracy,but it also eliminates t he need for precise clock synchronization between the base station and the tag,lowering the system's hardware requirements.This paper builds a simulation model of a positioning algorithm,focuses on simulation analysis of a positioning algorithm based on the TOA scheme,and compares and analyzes the advantages and shortcomings of typical positioning algorithms in order to achieve higher positioning accuracy.The Kalman filter is then proposed to improve the UKF algorithm of the observation vector to compensate for errors caused by multipath transmission of UWB signals in complex environments and Non Line of Sight(NLOS)propagation in practical applications,and a Chan-UKF algorithm is proposed to improve the UKF algorithm of the observation vector to comp ensate for errors caused by multipath transmission of UWB signals in complex environments and Non Line of Sight(NLOS)propagation in practical applications.The algorithm improves positioning accuracy by more than 50% over the Chan algorithm and the positioning accuracy reaches 15 cm in the line-of-sight environment,effectively suppresses the interference of the complex environment in the ultra-wideband positioning system,eliminates the large NLOS error,improves positioning accuracy,and has good stability,according to simulation analysis and actual test results.The latitude and longitude coordinates of tag points can be obtained using the positioning system developed in this topic.Because the base station and the tag use a relative coordinate system defined in a specific area,the positioning results of the system are also relative coordinates,necessitating the use of the base station's GPS module to calculate the latitude and longitude coordinates using the coordinate conversion method.From theoretical analysis to overall design of the positioning system hardware and software,a regional positioning system with high accuracy,stability,and real-time performance is finally realized,and the system performance is then verified through experiments.