组合模型在GPS高程转换中的应用

Application of Combined Model in GPS Height Transformation

在分析常用GPS高程拟合模型的基础上,提出了使用组合模型进行GPS高程拟合的新方法。该方法以1StOpt软件为工具,以拟合绝对误差平方和最小为目标,通过对曲面拟合模型和多面函数拟合模型赋予不同的权重,形成新的拟合模型,从而对整个区域实现GPS高程拟合。实际工程数据检验证明:使用组合模型进行GPS高程拟合能够在一定程度上提高GPS拟合高程的精度,具有一定的实践参考价值。

In this paper, a new method for GPS height fitting by using the Combined Model is presented, which is based on the analysis of common models for GPS height fitting. In the method, 1 StOpt software is used as a tool, fitting absolute error square minimum is the target while different weights are given for fitting of surface model and the fitting model for multiple surface function. As a result, a new model of fitting is formed, GPS elevation fitting based on combined model is realized on the whole area. Relative data analysis based on the complied program is conducted. The results indicate that the accuracy can be improved in some extent, and it can be used in engineering practice.