GPS大地水准面拟合模型研究

在调兵山地区，选择已用GPS定位技术求得大地高的76个已知点作为原始数据的基础上，采用两种数学模型建立大地水准面，模型包括二次曲面法和最小二乘配置法，这两种模型是在不分区拟合和分区拟合两种情况下进行的。通过实例发现，拟合点的选取及位置对拟合模型有很大影响，在平坦地区，采用不分区拟合时，二次曲面法和最小二乘配置法的模型所求的检验点高程异常的精度要好于分区拟合时的情况，二次曲面法比最小二乘配置法在求高程异常时精度要高，而在分区拟合和不分区拟合时都能满足精度要求。

Study on fitting model of GPS geoid

In Diaobingshan area, using 76 points which acquire geodetic height by GPS positioning technology known as the raw data, we create a mathematical model geoid, including quadric surface, least squares collocation method. One of these two models are fitted in the district and the district does not fit the two cases. Through examples we found that fitting points and the selected location of the fitting models have great impact. In the flat areas, when using non-Subregional Fitting, quadric surface and least squares collocation we can acquire height anomaly better than in Subregional Fitting situation, and Subregional Fitting and Not-Subregional Fitting can meet the requirements of precision.