桥梁施工控制三角高程中间观测法研究

在全站仪三角高程精度方面，把折光系数作为方向变量，根据全站仪三角高程中间观测法高差的计算公式．导出高差中误差的计算公式，并对中误差进行了详细分析和深入讨论。结果表明，实施有效的大气折光系数实时改正．以及采用适宜的测量技巧，是提高全站仪精密三角高程中间观测法高差精度的关键。

Study of Midpoint Observation's Methods with Triangle Elevation for Bridge Construction Control

In this thesis, the atmospheric refraction coefficient is considered as a direction variable in the triangle elevation accurately positioned with total station. We deduced that the square error's formula of elevation distinction according to the elevation distinction formula of midpoint observation by total station instrument's triangle elevation and made detailed analysis and further research about square error. It is proved that applying valid real time modification of atmospheric refraction coefficient and adopting suitable observation skill become the key to enhance positioning accuracy of total station instrument's triangle elevation.