Abstract:In this article, a new method called IEEMD (improved ensemble empirical mode decomposition) is introduced to build the correction of multipath error. Compared to EEMD (ensemble empirical mode decomposition), the new method can effectively solve the problem of model mixing and incomplete decomposition. It can also decompose the original coordinate sequence into different scales of modal components. The product of Gaussian white noise energy density and the average period is constant. Taking this condition into account, a new method is designed for automatic selection of scale and reconstruction to build the multipath error model. We can use it to correct the later coordinate series by the first day’s multipath model by the reason of the strong correlation between two successive days. The experiment results show that IEEMD can get more accurate coordinate sequence than EEMD, based on the same way of scale selection and stellar day filtering. To a certain extent, this study solidifies the theoretical basis of GPS high-precision real-time dynamic deformation monitoring.
ZHANG Chenglong,LIU Chao,ZHAO Xingwang et al. Research on GPS Multipath Error Modeling and Mitigation in View of Improved EEMD[J]. jgg, 2018, 38(10): 1021-1026.