Geocenter motion is the relative displacement from the center of mass of Earth to the origin of the Terrestrial Reference Frame.
地球质心(简称地心)是指包括海洋大气等的整个地球的质量中心，地心运动是地球质量中心相对于地球参考框架原点的位移。
For precise satellite orbit determination, the transformation should be done between the Celestial Reference Frame (CRF) and the Terrestrial Reference Frame (TRF).
卫星精密定轨中，需要计算天球坐标系(CRF)到地球固联坐标系(TRF)之间的转换。
The coordinate reference datum on which precision GPS survey is based, is ITRF International Terrestrial reference Frame that IERS offers.
高精度GPS测量所依据的坐标参考基准，是由IERS所提供的ITRF国际地球参考框架。
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