不同海潮模型对中国大陆构造环境监测网络GNSS数据解算的影响

Influence of different ocean tide models on GNSS data solution of CMONOC

选取2018年中国大陆构造环境监测网络GNSS基准站及中国周边IGS站数据,基于CSR4、FES2004、GOT00、NAO99b等海潮负荷改正模型,采用单一变量的解算方式,分析不同海潮模型对我国GNSS基准站基线、三维坐标、时间序列等造成的影响。结果表明:利用不同海潮模型解算基线精度,水平方向相差不大于1 mm,垂向相差不大于3 mm;各测站NEU坐标精度均在毫米级以下,以耿马站时间序列为例,与其他模型相比,基于FES2004模型解算的各向偏差趋势波动较弱,其年序列图的精度及连续性、稳定性更佳。简言之,利用FES2004海潮模型解算GNSS站点位置,效果较好。

By solving the data of Crustal Movement Observation Network of China(CMONOC)GNSS reference stations based on different ocean tide models such as CSR4,FES2004,GOT00 and NAO99b using the solution method of single variable,this paper analyzes the different effects of different ocean tide models on the baseline,three-dimensional coordinates,and time series of GNSS stations.The results show that the difference of the baseline accuracy of different models is within 1 mm in the horizontal direction and 3 mm in the vertical direction;the accuracy of N,E,U coordinates of all stations is below 1 mm.Taking the time series of Gengma Station as an example,the trend fluctuation of anisotropic deviation of FES2004 ocean tide model is weaker than other models,and the accuracy of annual sequence diagram is better and more continuous and stable.In short,FES2004 ocean tide model has better results for the location calculation of GNSS stations.