Rong Min 1,3) ;Sun Fuping 1) ;Zhou Wei 3) ; and Jia Xiaolin 2)
1)Institute of Surveying and Mapping, Information Engineering University,Zhengzhou 4500522)Xi’an Research Institute of Surveying and Mapping， Xi’an 7100543)Xi’an Information Division of Surveying and Mapping，Xi’an 710054
Abstract：In order to evaluate the real accuracy of the geocentric coordinate velocities determined with GPS,VLBI and SLR under the ITRF200，we compare the geocentric coordinate velocities obtained with the three techniques located on the same site. After that, we can obtain the transformation parameter and analyze mean square error of differences between the geocentric coordinates two by two, which, reflecting the real accuracy of VLBI,GPS and SLR geocentric coordinate velocities, is within 1 mm/a.It is shown that the real accuracy of the geocentric coordinate velocities with VLBI and GPS are better than that with SLR.
