通过地面网与卫星网的联合平差，以改善网的精度和建立高精度的地心坐标系统，是当前大地测量的一项重要任务。
It is an important mission of Geodesy to improve an accuracy of control networks and to establish the geocentric coordinate system via combined satellite and terrestrial network adjustment.
目前的一些地心坐标向大地坐标的转换模型在计算速度，稳定性或精度方面存在一定的局限性。
At present, there is certain localization in some formulae of transformation from geocentric coordinates to geodetic coordinates, such as rate of calculation, stability, or precision.
大地纬度的解算是从地心直角坐标到大地坐标变换的关键，通常都用采用迭代法实现。
The computing of latitude is the key of geodetic coordinate transformation from geocentric coordinate which conventionally USES iterative methods.
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