线性逼近法的应用。
求解开普勒方程可用逐次逼近法，这种方法还可推广到非线性方程的求解问题中。
Kepler s equations can be solved with the gradual approach, which can be further extended to the solution of the non-linear equations.
文中用逼近法和双线性变换法，设计了用于圆度测量的高斯数字逼近滤波器，并给出了零相移的递归滤波算法，计算量小，计算效率高，易于实现。
A series of Gaussian digital approximation filters used in roundness measurement were designed on the basis of approximation method and bilinear transformation.
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