Sidereal Filtering Based on Sphere Multipath Stacking and Its Application in PPP

Sidereal filtering (SF) is applied to reducing the error of static station observation caused by multipath. However, SF based on observation domain has some problems when used for static precise point positioning (PPP). Hence, an adapted algorithm named sphere multipath stacking (SMPS) is proposed and applied to PPP. The process of SMPS algorithm and the statistical algorithm that choose the appropriate cell size are presented in this paper. The experiment result that utilizes the data from 10 IGS stations shows that SMPS algorithm can reduce the multipath error of GNSS carrier phase observation and the accuracy of 1-3 hours positioning result improves clearly. The positioning accuracy improvement ratios of E, N, U directions are 41.59%, 38.60%, and 36.96%, respectively.