Availability of ITRF Frames in High Precision Satellite Positioning

For the multi-source selection of coordinates and velocities of IGS (International Global Navigation Satellite System Service) tracking stations, the coordinates and velocities of 4 IGS tracking stations in China were collected from 4 international organizations, and they were converted to the same reference frame and specified epoch to compare them. The comparison results show that the coordinates and velocities from the different international organizations are consistent well in the ITRF (international terrestrial reference frame) 2005, but the coordinates and velocities of a few IGS tracking stations are discrepant in the ITRF2000. Therefore, in order to reduce the impact of the difference on high precision satellite positioning, coordinates and velocities from different international organizations should be compared before adjustment calculation, and the latest data should be adopted.