Rearch On Compass Precise Positioning Algorithm Based On PSO

Beidou satellite navigation positioning system is a self-developed navigation system of our country,China.With the system is more and more gradually perfect,the work area is more and more widely,the development and application prospects of the Compass navigation system are also more and more increasingly broad.Especially,on the basis of the existing system,the methods of how to improve the positioning accuracy of the Compass Positioning are the focus of the vast domestic scholars actively.Beidou precise positioning algorithm is thehotspot of research on the positioning system,on the basis of precise positioning,phase positioning has the characteristics of improve positioning accuracy,and it has a great deal of research and application value.In the single-point positioning,the traditional least square method has low positioning accuracy due to the linearization error and strongly dependence on initial value.And the particle swarm optimization(PSO)algorithm which can improve the accuracy of Compass phase positioning effectively in the process of the Compass phase positioning.In this paper,through analyzing the characteristics of the phase positioning method and on the basis of the fomer combineing with the PSO algorithm,a new positioning algorithm PSO-phase is proposed.Firstly,we use the carrier phase observation to locate the approximate position of the receiver based on the least squares criterion,Established as a basic value and solution space of the PSO algorithm.Then the global optimal value is calculated by using the PSO algorithm,the results have the higher positioning accuracy.After the analysis of experimental verification,the PSO-phase algorithm can get the optimal solution and effectively improve the positioning accuracy of the Compass single-point positioning.In addition to the improvement on the phase of single point positioning algorithm,in this paper,we also design and realize the real time dynamic positioning RTK technology on Beidou navigation.RTK technology is a kind of relative positioning way of positioning which is based on carrier phase observations,it could mainly eliminate or weaken the relative error between the reference station and mobile station through the differential treatment,which can calculate the solution of higher positioning accuracy than single-point positioning.RTK technology has data communication equipment which has the transmission of real-timedata,the users can obtain real-time and high positioning accuracy of positioning results.In this paper,through the analysis of the positioning principle of RTK technology,we realize the RTK based on the relative positioning and the principle of differential positioning,we have static and dynamic experiments respectively by using the Beidou navigation system to obtain corresponding observation data,and validate the positioning accuracy of RTK positioning technology.After the analysis of experimental verification,in the static experiments and dynamic experiments of Beidou RTK,the positioning accuracy could reach level of cm.