南极国际GPS联测的海潮位移改正
Ocean Loading Tides Corrections of GPS Stations in Antarctica
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摘要: 根据海洋负荷潮理论,利用CRS4.0全球海潮模型,计算了参加南极国际GPS联测的中国南极长城站和中山站的海潮位移改正,并将海潮位移改正应用到GPS数据处理当中。在GAMIT软件的解算过程中,分别按加入和不加入海潮位移改正,对GPS基线分量进行了计算和比较分析。结果表明,对于南极国际GPS联测,海潮位移改正对GPS基线分量具有不可忽略的影响,数据处理时需要重点考虑。Abstract: The ocean loading tides corrections of GPS stations in Antarctica are described. Based on the theory of ocean loading tides, the displacement corrections of ocean loading tides on GPS stations in Antarctica are computed with CRS4.0 model. These corrections are also applied to GPS data processing. The GPS data are analyzed by the GAMIT software with and without these corrections. The authors compare and analyze the GPS baseline components to get the differences. The results show that the ocean tidal displacement corrections have obvious effects upon GPS baseline components. Therefore, we should not ignore the ocean loading tides corrections of GPS stations in Antarctica to obtain precise and reliable results.
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