基于EGM2008和移动曲面模型的GNSS高程拟合方法研究及应用

Research and Application of GNSS Height Fitting Method Based on EGM2008 and Moving Surface Model

随着GNSS高程测量的广泛使用,如何高精度求取高程异常成为作业的关键。鉴于沿海岛礁缺乏地形资料,提出一种基于EGM2008地球重力场模型提取高程异常长波项,移动曲面函数拟合残余高程异常的方法。结合青岛沿海岛礁实测数据,通过与常规直接拟合方法进行对比分析,结果表明,该方法能够提高GNSS高程拟合的精度,于沿海岛礁可以达到厘米级,可以替代四等水准测量。

With the wide use of GNSS height survey, how to get the height anomaly with high precision becomes the key to the operation. In view of the lack of topographic data of coastal islands and reefs, a method based on EGM2008 earth gravity field model is proposed to extract the long wave term of elevation anomaly, and the moving surface function is used to fit the residual elevation anomaly. Combined with the measured data of Qingdao coastal islands and reefs, through the comparative analysis with the conventional direct fitting method, the results show that this method can improve the accuracy of GNSS elevation fitting, and can reach centimeter level along the islands and reefs, which can replace the fourth-order leveling.