Research And Realization On The Algorithm Of GPS/BDS Precise Point Positioning

Precise point positioning technology is a method which uses observation data collected by a single global navigation satellite system receiver and precision clock and precise ephemeris to obtain high-precision coordinates.After more than 10 years of rapid development,the precise point positioning technology has been widely used in the field of LEO satellite orbit determination,aerial survey,ground deformation monitoring.Aiming at the problem of GPS/BDS precise point positioning accuracy and convergence time,precise point positioning algorithm based on GPS/BDS is proposed by using the basic theory of GPS and BDS single system precise point positioning.Based on in-depth study of GPS and BDS system of precise point positioning data processing strategy,systematically elaborated on the error source and its processing method of GPS/BDS composite system in precise point positioning,parameters of precise point positioning and using weighted least squares method improved estimation.With a large amout of data.The experimental results show that the positioning accuracy of GPS and BDS single system is obtained in the static precise point positioning experiment.Respectively,the horizontal direction run up to 5 cm and.1 cm and the elevation direction run up to 1.5 cm and 2.3 cm.Positioning accuracy of the GPS/BDS combined system runs up to 3 mm in the horizontal and positioning accuracy run up to 1 cm in the elevation.Respectively,the positioning precision of GPS and BDS single system in the horizontal direction which run up to 1.5 cm and 3 cm and the elevation direction reach 3 cm and 5 cm in the dynamic precise point positioning experiment.In convergence time,the convergence time of GPS and BDS single system static precise point positioning is about 50 min and 80 min and the GPS/BDS combination system convergence time is about 40 min.The convergence time of GPS and BDS single system is about 62 min and 110 min and the GPS/BDS combination system convergence time is about 56 min in dynamic precise point positioning experiment.