长江南京以下深水航道一期工程控制网布测

Layout and survey of controlling network in Stage I construction of deep-water navigation channel of Yangtze River at downstream of Nanjing Reach

长江南京以下12.5 m深水航道一期工程建设方案中,先期对通州沙、白茆沙水道进行治理。为了提供统一的坐标系统和高程基准,在工程范围内布测了首级GPS控制网。在南通、太仓、常熟建立了3座GPS基准站,按照GPS C级网、三等水准精度要求,平面上采用与JSCORS联测、GAMIT精密解算的方案,高程测量采用附和水准路线与三角高程结合的方案。经现场比测,信号稳定,满足精度要求。定期监测情况表明,三座基准站稳定可靠,运行状态良好。

In the Stage I construction of deep- water navigation channel（ at the depth of 12. 5 m） of Yangtze River at downstream of Nanjing Reach,Tongzhousha and Baimaosha waterways are regulated in advance. In order to provide a uniform coordinate system and height datum,the layout and survey of primary GPS controlling network is arranged,so as to ensure smooth implementation of the whole project. Three GPS reference stations were built in Nantong,Taicang and Changshu of Jiangsu Province. According to the precision requirements of the Grade C network of GPS and Leveling III,the program of JSCOS joint-measurement and GAMIT precise solution is adopted in plane; the program of annexed leveling line and triangular elevation is applied in elevation. The signals are stable through the in- situ comparison and measurement,which can meet the precision requirement. The regular monitoring result also indicates that the three reference stations are stable,reliable and well- running.