GPS高程控制网在1:5万重力调查高程异常改正问题中的应用

Application of GPS Elevation Control Network to the Elevation Anomaly Correction of 1:50 000 Gravity Survey

在没有精细大地水准面模型的地区开展1:5万重力调查工作时,采用布设GPS高程控制网的形式,求得高程异常改正模型,解决高程异常改正问题。布设GPS控制网时已知高程控制点要多于6个,适当地选用某种数学模型(多项式曲线拟合、多项式曲面拟合,多面函数拟合等)拟合出测区的大地水准面,然后用插值的方法再推算出其它GPS点和正常高程值,提高重力测点的高程精度。

When the area in the absence of a precision geoid model carry out the work of 1：50 000 gravity survey, the form of GPS elevation control net is used, the correction model of the elevation anomaly is obtained, the problem of correcting height anomaly is solved. The known height control points are more than six when the GPS control network is set up, mathematical models of appropriate selection（polynomial curve fitting, polynomial fitting curved surface, polyhedral function fitting） fit the geoid of the measurement area,then the else GPS points and normal elevation numerical value are calculated by the interpolation method, increasing the elevation accuracy of gravity measurement points.