Research And Improvement Based On TOA Positioning Algorithm In Three-dimensional Space

In recent years,along with the popularization of mobile Internet technology,based on the user location information service develops rapidly,among these,GPS,Beidou positioning technology,and related GPS-one,A-GPS,and other auxiliary positioning technologies have played a key role.However,the positioning technology is in some special situations(e.g.,indoor,underground tunnel,etc.),due to the influence of nonline-of-sight propagation,clock synchronization,measurement accuracy and other factors,the positioning accuracy in these scenarios is limited.Focusing on this problem,combined with TOA positioning technology,this paper proposes ECA-TOA positioning algorithm.This article first focuses on measurement errors caused by non-line-of-sight propagation and clock synchronization,the concept of NLOS distance error factor was proposed to eliminate the effect of measurement error on positioning accuracy;facing the traditional channel path loss model,a channel path loss model for adaptive propagation environment is proposed to modify the distance between nodes;in order to solve the problem of nonlinear computing,the maximum likelihood estimation method based on the regularization is proposed to modify the position information of the mobile terminal;finally,the improved differential evolution algorithm is used to calculate the location information of mobile terminals instead of the maximum likelihood estimation method.Through simulation experiments,it is verified that the proposed three-dimensional positioning algorithm has significantly improved positioning accuracy compared with traditional positioning methods.