文章根据镜像原理，提出了简单实用的数值拟合公式与求无穷和项截断误差估计关系式。
According to mirror image principle. a simple and practical formula for numerical match and a dependence for estimating truncation error of summing up infinity terms are proposed out.
通过合理控制计算量，得到了微分方程近似解的局部截断误差的估计。
The local truncated error estimation of the approximately solution could be obtained with reasonable computational cost.
在目前靶场数据处理中，参数估计与补点计算等常用多项式拟合，往往带来较大的截断误差。
In currently range data processing, the estimate of parameters and patch calculating usually use polynomial to approximate, which often make much more truncation errors.
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