中国大陆速度场在CGCS2000坐标转换中的应用研究

Research on the Application of Velocity Field in Chinese Mainland in CGCS2000 Coordinate Conversion

基于中国大陆区域2074个具有实测速度的已知测站,进行中国大陆速度场在CGCS2000坐标转换中的应用研究。采用不同内插组合方法,充分考虑未知点与已知速度测站的距离因素,使已知速度测站的数据得到充分利用。相比于单纯利用速度场格网模型,该方法得到的未知点速度精度具有较大幅度提高,其在点位X、Y、Z三个方向上的历元归算精度最高可提高24.00 cm、10.89 cm和17.82 cm,对利用已知速度的测站提高历元归算精度具有一定指导意义。

Based on 2074 known stations with actual measured velocities in Chinese mainland,we carry out the application research of velocity field in Chinese mainland in CGCS2000 coordinate conversion.We use different interpolation combination methods to fully consider the distance factor between unknown points and known velocity stations,so that the data of known velocity stations can be fully utilized.Compared with the calculations using velocity field grid model,the velocity accuracy of unknown points obtained by this method is improved substantially,and the accuracy of epoch conversion improves by up to 24.00 cm,10.89 cm and 17.82 cm in X,Y and Z directions of the points,which is a guideline to improve the accuracy of epoch conversion using known velocity stations.