收敛校正可使直角坐标系能适应经纬度(坐标)的变化。
A convergence correction accommodates the change from rectangular coordinates to latitude and longitude.
建立了溶质平均收敛点坐标的计算方程，并从自由能变的角度表征了收敛点坐标的物理意义，阐明了收敛点的纵坐标相等的原因是溶质在收敛点处的自由能变为零。
A general equation was derived for calculating the coordinates of the convergent point. The physical meaning of the coordinates was discussed from the point of view of thermodynamics.
由于坐标测量机几何误差变化规律复杂，采用一般的BP神经网络模型算法，速度慢且难以收敛。
Owing to the complicated variable rule of CMMs geometry error, it's difficult to convergence for using common BP neural network model arithmetic with a slow velocity.
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