Abstract：The current mathematical model and parameter estimation method in Precise Point Positioning (PPP) are introduced, and then the way to improve convergence in PPP is introduced. The improvement includes: 1) the adaptive filtering by selection of the parameter weights is applied in the parameter estimation; 2) the selecting weight fitting method is employed to determine the initial parameters and corresponding variancecovariance. According to the new method, the paper develops the PPP using IGS rapid precise ephemeredes products (latency of 17 hours).The calculation examples demonstrate that the position precision can achieve decimeter to centimeter in the short time, and satisfy the requirement of efficiency.
