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.
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。
Surface should be used as a fine datum to be processed first, because the precision of the positioning of the surface is more accurate, the smaller the clamping error is.
用作精基准的表面应先加工出来，因为定位其准的表面越精确，装夹误差就越小。
The micro Angle error between optical coordinate and mechanical datum coordinate of robot vision instrument due to mechanical assembly can be corrected by high accuracy calibration.
机器人视觉仪器由于机械安装引起的光学坐标系与机械基准坐标系之间的微小的角度误差可以通过高精度标定修正。
Relative positional error may have different meanings with the different new datum choosing.
随着新基准的不同选择，相对点位误差可有多种含义。
Accoding to the concept, datum contained careless error are rejected, data management is simplified and measure of precision of measurement result is raised.
利用这一概念，可剔除含粗大误差的数据，从而简化数据处理，提高测量结果的精确度。
GPS data analysis, systematical error analysis, datum.
GPS数据分析，系统误差分析，基准。
After the mathematical model of the system is developed, a practical method of establishing a testing datum is advances. Moreover, the system error is analyzed and estimated.
在建立了测量数学模型之后，提出了适用的测试基准建立方法，并对基准建立后的系统误差进行了分析计算。
With a collimator and a 23 polyhedron as measuring datum, a set of optical angular encoder measuring data, which containing the eccentricity error, was obtained.
以平行光管和23面棱体为基准，得到存在偏心误差的一组光栅角编码器测量数据。
The correct value of radial circular run-out error with respect to a single datum axis can not be obtained in the traditional measuring method.
用传统的测量方法不能得到单一基准径向圆跳动误差的准确值。
The results were as follows. The horizontal datum and two-pass statics method gave minimum depth error on time section.
试验结果表明，采用水平基准面两步法静校正，时间剖面反演深度误差最小；
This paper also presents a method to solve the tunnel axis displacement on line caused by angle error between tube center axis and datum of joint.
分析了对接面与管段中心线夹角误差对沉放后线路位置的影响，提出了控制隧道轴线偏差的措施；
This paper also presents a method to solve the tunnel axis displacement on line caused by angle error between tube center axis and datum of joint.
分析了对接面与管段中心线夹角误差对沉放后线路位置的影响，提出了控制隧道轴线偏差的措施；
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