方差分量估计在施工控制网建立中的应用

在施工平面控制网的复测和加测中 ,对先期控制点老坐标和全站仪野外观测值的中误差如何给定 ,关系到控制网新坐标的网形精度和与老坐标的差异程度 .因此 ,应用对先期控制点坐标进行赋权参加平差的原理以及对各类观测值方差分量进行严密估算的理论 ,根据估算结果重新调整各类观测值中误差再重新整体平差 ,以达到合理效果 ,并介绍了工程应用实例 ,分析验证了这种方法的有效性

Application of Variance Components Estimation in Construction Control Network

In observation adjustment of construction control network,how to give each weight coefficient of the old coordinate and field observation is very important,which not only influence the relative precision between the new coordinates of control points but also decide the difference between old coordinate and the new.The theory which gives old coordinates a mean square error to join in total adjustment is presented.In order to make the value of adjustment best,the method of variance component estimation is applied to estimate each mean square error of observations.One actual engineering example is given,and the effectiveness of this method is analyzed.