基于大地四边形RTK法与高程异常变化率法的跨海水准应用研究

Research on the Application of Sea-crossing Leveling Based on Geodetic Quadrangle RTK Method and Abnormal Change Rate of Elevation

跨海水准测量因岛屿无道路可通行及海风大等因素,传统跨河水准测量方法较难实现。在平坦地区,较容易获取精确的GPS大地高,利用GPS大地高与正常高的关系可分别求取测区一侧的坐标转换参数及桥梁两岸的高程异常变化率。结合传统跨河水准测量大地四边形布网法,分别利用RTK观测和高程异常变化率取平均值间接获取跨海基线的正常高高差,并在跨海桥梁工程项目中得以验证。

Due to the factors such as no road to pass and strong sea breeze,the traditional cross river leveling method is difficult to achieve.In the flat area,it is easy to obtain the precise GPS geodetic height.By using the relationship between GPS geodetic height and normal height,the coordinate conversion parameters on one side of the survey area and the abnormal change rate of elevation on both sides of the bridge can be obtained respectively.Combined with the traditional geodetic quadrilateral network method of river-crossing leveling,the normal height difference of sea-crossing baseline is obtained indirectly by using RTK observation and the average value of elevation abnormal change rate,which is verified in the project of sea-crossing bridge.