Abstract: In recent years, it has been found that there were both white noise and colored noise in the coordinate time series of GPS stations. In order to study the effect of colored noise on the three dimensional velocity estimations in East Antarctica region, the measured data of 6 GPS stations from 2005 to 2014 were used for solution and adjustment by GAMIT/GLOBK10.5 software, and the maximum likelihood method (MLE) was used to estimate the three dimensional velocities and errors of the GPS stations when two noise models were assumed. The results show that when two kinds of colored noise (flicker noise and random walk noise were considered), the 3D velocity estimations of GPS stations in East Antarctica region have small changes, the maximum impact magnitude is 0.3 mm/a in horizontal and 0.8 mm/a in vertical. However if the colored noise was not considered, the parameter estimations of the true uncertainty would be seriously underestimated.

Key words: East Antarctica, GPS, coordinate time series, colored noise, three dimensional velocity