Research And Implementation Of Indoor Location Algorithm Based On UWB

Entering the 21 st century,with the vigorous development of various sectors of society and wireless communication technology significant progress,the needs on the high-precision wireless positioning have beenincreasing gradually.Indoor positioning technology is a category of positioning technology,it has some similarities with the outdoor positioning technology.But the indoor environment is complex,poor positioning environment,and the indoor space is generally small,so the requirements of the positioning accuracy and security in indoor positioning are higher.Indoor signal is generally relatively weak,and there are serious multipath effects and reflection phenomena,which requires strong robustness to the corresponding indoor positioning algorithm for a variety of errors.In recent years,wireless communication technology has developed rapidly.Among them,Ultra Wide Band technology is a new radio communication technology of the great development prospects,which has been considered one of the top ten communications technology.UWB with great bandwidth,can achieve short-range and high-speed data transmission,it has a higher time resolution,and has a strong anti-multipath fading ability,in the high-precision ranging and positioning by a larges concern.In this paper,several indoor positioning technology comparison as an introduction,compared and illustrated the UWB in the indoor positioning of the advantages.To design convenient and practical indoor positioning system and improve the positioning accuracy for the purpose,focusing on the following aspects of the work done:(1)Introduce several commonly used indoor positioning techniques,compare their advantages and disadvantages,use UWB positioning as the key research object,the UWB technology-related theoretical knowledge is briefly introduced,and its application scenarios are also introduced.(2)To complete the UWB positioning system hardware circuit design,use STM32 as the master chip,Deca Wave’s ultra-wideband communication module DWM1000 used to determine the distance between the points,Wi-Fi used to communicate with PC equipment.(3)Compared with the advantages and disadvantages of several positioning methodsunder UWB communication,TDOA method is used as the positioning method of the designed positioning system and studied deeply.This paper focuses on several positioning solutions for the position estimation of the target nodes in the TDOA scheme.The formulas are deduced and the MATLAB simulation experiments are carried out for several solutions.(4)A method of improving the position estimation algorithm of Chan’s algorithm based on Kalman filter is proposed,and the simulation experiment is completed by using MATLAB.Under the experimental conditions,the positioning accuracy of the traditional Chan algorithm is given ?30cm improved to the ?10cm.The UWB positioning system software is implemented based on DWM1000 module,and the distance error curve is drawn in the experimental environment.The improvement of the actual measurement result is completed by the error curve fitting and the real-time error compensation of the ranging value.(5)Developed the aided design of the small tools,written a remote control display client software,written the PC software for easy real-time collection of ranging data for distance analysis and filtering algorithm analysis.The innovations of this paper are mainly as follows:(1)Proposed a ranging value optimization algorithm to sliding window ranging value weighted filtering,so that the system can be in complex environments ranging from more stable performance.(2)In the case where the base station is arranged as little as possible,a new algorithm of Chan’s algorithm combined with Kalman filter is proposed to estimate the position of the target node,and positioning accuracy is improved.In the laboratory test environment,the positioning accuracy of the positioning system can be achieved in the two-dimensional plane ?15cm,The experimental results show that the positioning system designed in this paper has reached the practical purpose.