Helmert方差分量估计在隧道贯通中控制导线平差的研究

为了探讨加测陀螺方位角后导线的定权和平差，根据现代测量平差理论中的Helmert方差分量估计法定权对加测陀螺方位角的井下控制导线进行平差．以上海415工程实例的贯通数据进行计算和验证，结果表明，Helmert方差分量估计定权与给定的先验中误差无关，总是收敛到一个相同的平差结果；先验中误差与Helmert方差分量估计定权的迭代次数或收敛速度有关；Helmert方差分量估计定权迭代平差，井下控制导线端点横向精度可提高约60％．

Study of Helmert Variance Component Estimation in Tunnel Run-through Control Traverse Difference

The determination of weight and traverse difference with adding peg-top azimuths surveyed were investigated based on the modern surveying adjustment theory of Helmert variance component estimation method used in the underground traverse difference with adding peg-top azimuths surveyed. This method is verified to be feasible by the run-through data of 415 project in Shanghai. The results show that Helmert variance component estimation to determine weight always converge to the same adjustment results and is not related to the given prior square error the prior square error is related to the iterative number or convergence rate of Helmert variance component estimation to determine weight ; the transverse precision of underground control traverse node is increased by about 60% using iteration to determine weight of Helmert variance component estimation method.