应用GPS技术实现跨鄱阳湖高程基准的精确传递

Application of GPS technology to realizing the accurate elevation transmission across Lake Poyang

近年来跨越江河、湖泊的水利枢纽、大桥及隧道等大型工程建设项目如雨后春笋,为其提供测绘保障服务的跨河水准测量随着跨距的增大,技术难度越来越大,传统的跨河水准测量方法与手段凸显窘境。结合跨鄱阳湖长距离GPS水准测量实践,提出利用区域似大地水准面精化成果布设符合高程异常线性拟合条件的跨河方向轴线和联测方案,以及采用GNSS数据预处理软件TEQC改善基线向量的解算精度等综合技术手段,实现由大地高差到正常高差的精准转换。

Recently, large construction projects, such as water control, bridges and tunnels across rivers have sprung up. With the span increasing, river-crossing leveling technology is more and more difficult. The traditional method of river-crossing leveling is becoming limited. Based on the practice of GPS leveling which is a long distance across the Lake Poyang, it presents a measurement scheme, which makes use of the results of refined regional geoid and layouts of rive-crossing axis on which the height abnormity is linear. Then TEQC which is a GNSS data preprocessing software is used to improve the precision to the solution of the baseline vector. Furthermore, some other technical means are included. After that, the geodetic elevation can be transformed to the normal height precisely in the scheme.