济南市轨道交通R1线卫星定位控制网复测稳定性的多限差分析

Stability Analysis Based on Multi-tolerances of the Repetition Measurement in Ji'nan Rail Transit R1 GPS Control Network

城市轨道交通控制网是后续施工测量的基础,定期对其复测并分析其稳定性能有效保证工程各阶段的平稳推进。以济南市轨道交通R1线卫星定位控制网为例,通过引入坐标之差、相邻点坐标差之差的相对精度、距离较差、方位角之差、相邻边夹角之差等多个限差,分析控制网的稳定性。结果表明,两次测量点位坐标差、方位角之差、相邻点间坐标差之差的相对精度和距离差值对于发现不稳定控制点最为有效。考虑到实际通视边长条件的不同,综合分析相邻点间坐标差之差的相对精度和绝对误差能更有效地判定控制点的稳定性。

Urban rail transit control network is the basis of follow-up construction measurement.Regular repetition and stability analysis can ensure the smooth progress of the various stages of the project.In this paper,taking an example of Ji'nan rail transit R1 line GPS control network,by introducing the difference between the coordinates,the relative accuracy of the difference between the adjacent points,the difference of the distance between adjacent points,the azimuth angle,between the adjacent edges,etc to analyze the stability of the control network.The results show that the relative accuracy,the azimuth angle and the difference of the distance between adjacent points can be the most effective for finding the unstable control points.Taking into account the actual conditions of the different conditions,comprehensive analysis the relative accuracy and absolute error of the difference between the adjacent points can be used to find unstable control point more effectively.The multi-tolerances method Proposed in this paper have a certain reference for the following-up urban rail transit control network stability analysis.