Ocean tide loading displacements in western Europe: 1. Validation of kinematic GPS estimates
Ocean tide loading displacements in western Europe: 1. Validation of kinematic GPS estimates
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DOI：
10.1002/2015jb011882
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
N. Penna;P. Clarke;M. Bos;T. Baker
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文献类型：
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作者：
N. Penna;P. Clarke;M. Bos;T. Baker
GPS已被广泛应用于潮汐地面位移估算，但其精度尚未得到系统验证。利用分布在西欧的20多个站点，我们表明，经过适当调整的过程噪声约束的后处理动态精密单点定位GPS能够恢复插入到实际数据中的合成潮汐位移，根据时间序列噪声的不同，典型的精度为0.2 mm。运动学方法不会导致信号从一个坐标分量到另一个坐标分量的错误传播，也不会导致同时估计的对流层延迟参数。它对日常设备和参照系变化的可能影响以及数据中断具有很强的稳健性。建议数据跨度至少为4年，可用性至少为70%。最后，我们表明，通过将对流层延迟限制在静态批量GPS分析中先前估计的值来降低视坐标时间序列噪声的方法，实际上导致了对真实潮汐信号的抑制。使用我们的运动学GPS分析方法，可以可靠地观测到0.2 mm级别的周期性位移，这适用于海潮和固体地球响应模型的测试和改进。
GPS has been extensively used to estimate tidal ground displacements, but the accuracy of this has not been systematically verified. Using more than 20 sites distributed across western Europe, we show that postprocessed kinematic precise point positioning GPS with appropriately tuned process noise constraints is capable of recovering synthetic tidal displacements inserted into real data, with a typical accuracy of 0.2 mm depending on the time series noise. The kinematic method does not result in erroneous propagation of signals from one coordinate component to another or to the simultaneously estimated tropospheric delay parameters. It is robust to the likely effects of day‐to‐day equipment and reference frame changes, and to outages in the data. A minimum data span of 4 years with at least 70% availability is recommended. Finally, we show that the method of reducing apparent coordinate time series noise by constraining the tropospheric delay to values previously estimated in static batch GPS analysis, in fact, results in the suppression of true tidal signals. Using our kinematic GPS analysis approach, periodic displacements can be reliably observed at the 0.2 mm level, which is suitable for the testing and refinement of ocean tide and solid Earth response models.