结果表明采用曲线拟合法能使测距绝对误差在3个采样点以内，与传统的反射波起始点确定方法相比有较大优势。
The absolute error is no more than 3 sampling points, so it has more advantages compared with the traditional methods to judge the start point of reflect wave.
本文讨论了两个问题：1控制网的精度评定中，顾及起始数据误差影响的必要性。
This paper deals with the following problems, 1 the necessity of taking the influence of initial datum error into account when estimating the accuracy of a control network.
解决了顾及起始数据误差的工测多级控制网的精度梯度。
The problem of measuring accuracy gradient of multi-class engineering control network, which accounts for the initial data errors, has been solved.
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