基于EGM2008模型的GPS水准拟合方法应用研究——以尼泊尔西北部山区某水电站测量工程为例

Research on the Application of GPS Leveling Fitting Method Based on EGM2008 Model——Taking a Hydropower Station Survey Project in the Northwestern Mountainous Area of Nepal as an Example

常规GPS水准拟合方法被广泛应用于测量工程中,但其具有精度不够高的缺陷。对此,文章针对尼泊尔西北部山区某水电站测量工程中水准测量施测困难的问题,结合算例对基于EGM2008重力场模型的GPS水准拟合方法进行研究,并且与传统的GPS水准拟合方法进行对比。结果表明,在尼泊尔山区某水电站高程控制测量中,该方法的测量精度相对传统水准拟合方法有很大提高,且该方法能够满足四等水准测量的要求。

Conventional GPS leveling fitting method is widely used in survey projects, but its accuracy is not high enough. In this regard, aiming at the difficulty of leveling measurement in a hydropower station survey project in the northwestern mountainous area of Nepal, this paper studies the GPS leveling fitting method based on EGM2008 gravity field model, and compares it with the traditional GPS leveling fitting method. The results show that in the elevation control survey of a hydropower station in the mountainous area of Nepal, the measurement accuracy of this method is greatly improved compared with the traditional leveling fitting method, and this method can meet the requirements of fourth-order leveling.