Research On High Precision Positioning Technology Based On Space Based Pseudolite

With the increasing demand for location-based services from the general public life and production,and with the completion of global constellation deployment of China's Beidou-3 global satellite navigation system,it can provide all-weather,all-time,high-precision location services for global users.But it has its own vulnerability limitation in its signal system.In the paper,it studies the high-precision positioning technology of the pseudolite system,which provides the supplement and backup for the satellite navigation system.As pscudolite system is the backup system of satellite navigation system,which is flexible and regional enhanced It is divided into two types:foundation and empty foundation.The layout optimization of the pseudolite in the dynamic and constrained path,and the positioning of ite own position in the dynamic environment.The main research contents of this article are as follows:1.This paper analyzes the definition of space-based pseudolite,positioning principle and common error analysis.Then the near far effect and multipath effect are analyzed.Aiming at the layout optimization technology of space-based pseudolite platform,different layout optimization methods are compared and analyzed.Finally,the simulation results show that the algorithm can meet the DOP value convergence of space-based pseudolite under dynamic and constrained paths.2.In the aspect of positioning and tracking,aiming at the limitations of Kalman filter algorithm in dealing with nonlinear systems and traditional improved filtering algorithmsssuch as extended Kalman filter(EKF)and unscented Kalman filter(UKF)is an improved algorithm based on the UKF algorithm.The algorithm proposed in this paper guarantees the non negative qualitative and symmetry in the process.3.The comprehensive test and evaluation environment of software simulation+sports car test and indoor navigation test field is established.The performance difference betw een the improved algorithm and the traditional target tracking algorithm in dealing with strong nonlinear system is analyzed by MATLAB simulation software.The superiority of the algorithm is proved by experiments.