Update China geodetic coordinate frame considering plate motion

Abstract China Geodetic Coordinate System 2000 (CGCS2000), as the formal national coordinate reference frame, has been used for 20 years. The coordinates of all Global Navigation Satellite (GNSS) stations in need referring to this system. To end, first step is align stations, usually included a regional GNSS network, with given International Terrestrial Reference Frame (ITRF), then these are corrected CGCS2000 consideration plate movement. For better alignment result, control needed and their were estimated from combination constraint-free normal equation systems provided by several Service (IGS) analysis centers. effect using refined coordinates, which determine datum, on result should be evaluated corrections i.e. smaller mean alignments two associated frames. test results show that more accurate than ones calculated station's velocity, well aligned ITRF2005. Moreover, obtaining an updated gridded linear velocity field based velocities at 1025 was generated mainland optimal interpolation method, inverse distance weighting, selected five methods. overall precisions constructed East ( E ) and, North N directions 0.78 mm/a 0.95 mm/a, respectively. evaluating accuracy monthly solutions some CORS ITRF2014 during period 2000.0 2018 obtained Root Mean Square (RMS) differences between known about 2–3 cm.