Noise analysis and velocity field correction of Inner Mongolia CMONOC coordinate time series

This paper use the Global Navigation Satellite System (GNSS) data product service platform of China earthquake administration to obtain the observation data of 15 continuous terrestrial network stations in the Inner Mongolia from 2010-06 to 2021-06, and use GAMIT/GLOBK software and HRCTOR software to calculate the coordinate time series after removing the singular values. Finally, Bayesian information criterion (BIC) numerical analysis is combined with to determine the optimal noise model: the optimal model of Inner Mongolia coordinate time series in the east (E) direction is white noise+flicker noise (WN+FN), and the optimal noise model in the north (N) and zenith (U) directions is white noise+power law noise (WN+PL). The optimal noise model is used to correct the velocity field. Under the ITRF14 framework, the average moving speed of the land network in Inner Mongolia is 30.653 mm/a, and the moving direction is 26°57′51″SEE; The average moving speed in the vertical direction is 0.792 mm/ a.