摘要
结合鄂北地区水资源配置工程,首先研究西北-东南走向的超长调水线路的施工坐标系的建立问题,实现了顾及高程归化的斜轴墨卡托投影的工程坐标系,避免了采用高斯投影产生的沿东西方向分带较多的问题,满足控制网边长综合投影变形小于10 mm/km的设计要求。其次,对工程中的宝林隧道洞外GNSS控制网进行观测和数据处理,分别采用BDS、GPS、BDS+GPS 3种模式解算各个时段的基线向量,并以GAMIT解算值作参考进行成果的精度分析。结果表明,BDS可以满足宝林隧道的测量精度要求。对比BDS、GPS单系统基线结果,N与E方向差异保持在5 mm左右,U方向大部分保持在10 mm左右,BDS+GPS解算结果的精度高于任何一种单系统。最后,对宝林隧道洞内平面控制网的布设方案进行分析,并针对单一导线法、交叉导线法加测陀螺方位角,将其作为新增观测量进行联合平差,得到优化布网方案。
Based on north Hubei water redistributing project, this paper studied the setting up of the construction coordinate system for north-west and southeast spanning water project at first, put forward an oblique Mercator projection with height adaptation to establish the project construction coordinate system, and avoided the multi-zone problem of Gaussian projection along east-west. The distance distortion was kept down to ±10 mm/km. And then, the paper observed and processed the external GNSS control network of Baolin tunnel of the project. The paper used BDS, GPS and BDS+GPS to calculate the baseline respectively, and analyzed the precision by comparing with the GAMIT solution. The result shows that the precision of the BDS results is satisfied for Baolin tunnel control network. Comparing BDS and GPS solutions, the differences in northing and easting are less than 5 millimeters, and 10 millimeters for up component, the BDS+GPS result is better than BDS or GPS only result. Finally, this paper designed two kinds of control network, namely single-traverse method, crosstraverse method, and reintroduced gyro azimuth for the methods, which was used as a new observation for the combined adjustment, then got the optimal network layout for guiding the construction of the project.
出处
《地理空间信息》
2017年第12期1-5,共5页
Geospatial Information
基金
湖北省水利重点科研资金资助项目(HBSLKY201608)
关键词
斜轴墨卡托投影
投影变形
控制网
宝林隧道
水资源配置工程
oblique Mercator projection
projection deformation
control network
Baolin tunnel
water resources allocation project
