精密单点定位结合EGM2008模型在新疆某河地质断面测量中的应用

针对新疆某河地质断面测量范围大、测区通行困难、测量部位分散、传统控制测量方法工作量大且效率低的问题,在测区每条断面上布设断面基点作为控制点并用GNSS接收机静态观测(无需同步),选用武汉大学开发的Trip2.0软件加载事后精密星历和精密钟差等信息解算静态观测数据得到ITRF框架下的三维坐标,然后采用TBC软件加载EGM2008超高阶地球重力场模型点校正得到控制点的国家平面坐标和正常高。结果表明,Trip2.0软件计算的三维点位中误差最大为0.066 m,点校正坐标转换残差与已知点差值均满足限差要求;该方法平面控制测量工作量比传统方案减少46%,五等水准测量比传统方案减少98%,节约工期约56%。实践表明,采用该方法可快速地实现测区面积大、测点分散、控制点稀少区域的平面及高程控制测量。

Application of Technology of PPP Combining with EGM2008 in a River’s Geological Section Survey in Xinjiang

Aiming at the problems of a river’s geological section survey in Xinjiang,such as large measurement range of geological section,difficulty of passing through the survey area,scattered measurement parts,large workload of traditional control measurement methods and low work efficiency.Set the base point of each section in the test area as the control point and make static observation with GNSS receiver(no synchronization required).The Trip2.0 software developed by Wuhan University was used to calculate the static observation data and obtain the three-dimensional coordinates under the ITRF framework by loading the information such as Precise Ephemeris and precision clock error after the event,and then uses the TBC software load EGM2008 Ultra-High-Degree gravity field correction get National Coordinates and Normal Height of the control point.The results show that the maximum error of the three-dimensional point calculated by Trip software is 0.066 m,and the residual error of point correction coordinate conversion.and the difference between the point and the known point all meet the requirements of the limit difference.The workload of planar control measurement is 46%less than that of traditional scheme.Five level measurement reduced by 98%compared with the traditional scheme,Working days saved about 56 percent.The practice shows that the method can be used to realize the plane and elevation control measurement of large area,scattered measuring points and few control points.