中国地心3维坐标框架应具有的特点；
The characteristics of a Chinese modern geocentric 3D coordinate frame;
建立了同时顾及坐标框架系统参数和地壳运动参数的GPS网联合平差模型。
The adjustment model for combined GPS networks considering systematical parameters for the coordinates frames and parameters for the crustal movement is established.
在必要性方面重点讨论下面几个方面的问题：中国大地坐标系统和大地坐标框架的现状和问题；
The following topics in necessity are discussed: The situation and problems in Chinese existing geodetic coordinate system and its frame;
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