中文摘要：

2000国家大地坐标系（CGCS2000）在我国启用将使得许多测绘成果的坐标面临转换，需要研究具有较高精度的坐标转换方法。由于我国天文大地网存在较大的局部系统差和累积误差，采用Bursa模型完成向高精度地心坐标系的转换时往往还剩余较大的残差。为了提高转换精度，这里提出了一种方法，通过将转换区域划分为小的格网单元，然后利用Bursa模型、加权平均模型计算得到每个格网节点的坐标转换改正量；最后再通过格网内插得到其中任意位置的坐标转换改正量，从而完成坐标转换。该方法保证了局部的细致拟合和整体上的连续。试验结果表明，该方法可使天文大地网的局部系统差和累积误差得到有效地控制，避免了转换后较大残差的出现。

英文摘要：

China Geodetic Coordinate System 2000（CGCS2000） is used in our country and the coordinate of surveying and mapping products need to be transformed, the method of coordinate transformation with high precision also need to be studied. In the astro-geodetic network of our country, large local systematic error and accumulative error exist. It is always the case that large residuals still remain after the transition to high-precision geocentric coordinate system adopting Bursa model. In order to improve transformation accuracy, one method is proposed in this paper, that is, the transformation area is divided into small grid cell, then the coordinate transformation correction of each grid node is computed adopting Bursa model and weighted average model, finally, the coordinate correction of any place can be gotten by grid interpolation, and the coordinate transformation is achieved. This method makes sure that the partial is fit well and the whole is continuous, and the experiment result shows that large local systematic error and accumulative error in the astro-geodetic network are controlled very well by adopting this method, and large residuals are avoided after transformation.