中文摘要：

基于等效源原理,提出了一种半自由点质量模型,并给出了顾及相邻点空间关系构造虚拟点质量的简单快速迭代算法。实验结果表明,利用该点质量模型对离散GPS/水准观测数据进行拟合是可行的。

英文摘要：

To determine an orthometric height using GPS,it is necessary to know the geoid/ quasigeoid undulation.Many methods have been studied for the interpolation of discrete GPS/leveling data to get the geoid/quasigeoid undulation unknown.A new half free-positioned point masses model is proposed based on equivalent sources theory.Corresponding iterative algorithm to construct the point masses is also presented considering the relationship of the nearest GPS/leveling points.The results in Hong Kong and Shenzhen show that the point masses model is efficient for the interpolation of geoid/quasigeoid undulation.