GPS精密定位中的海潮位移改正
Ocean Tidal Displacement Corrections in GPS Precision Positioning
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摘要: 根据海洋负荷潮理论,利用NAO99b全球海潮模型,计算了中国部分IGS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基线分量和测站坐标分别进行了计算和比较分析。结果表明,海潮位移改正无论是对GPS基线分量还是对测站坐标,都有一定的影响。Abstract: Based on the theory of ocean loading tide,by using NAO99b global ocean tide model,the ocean tidal displacement corrections for some IGS stations in China are calculated.These corrections are also applied to GPS data processing.The GPS baseline components and station coordinates computed by the GAMIT software with and without these corrections are computed,compared and analyzed.The results show that the ocean tidal displacement corrections have effects both on GPS baseline components and on station coordinates.To short time GPS data processing,the corrections are more than 1mm;but to long time processing,the corrections have little effects.
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