Calibration and Validation of the Jason-2/OSTM Advanced Microwave Radiometer Using Terrestrial GPS Stations
Calibration and Validation of the Jason-2/OSTM Advanced Microwave Radiometer Using Terrestrial GPS Stations
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DOI：
10.1080/01490419.2011.584839
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发表时间：
2011-07
期刊：
影响因子：
1.6
通讯作者：
A. Sibthorpe;Shannon T. Brown;S. Desai;B. Haines
中科院分区：
文献类型：
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作者：
A. Sibthorpe;Shannon T. Brown;S. Desai;B. Haines
我们使用地面全球定位系统 (GPS) 站对天顶对流层延迟的估计来验证 Jason-2/海洋表面地形任务 (OSTM) 高级微波辐射计 (AMR) 的湿路径延迟测量。我们验证了“T”版地球物理数据记录 (GDR) 中提供的 AMR 湿路径延迟测量值以及使用最近开发的沿海算法生成的测量值，该算法将应用于“C”版 GDR。新的沿海算法将 25 公里陆地内 GPS-AMR 差异的方差减少了 28%。该算法还可以提高接近陆地 15 公里（而不是 25 公里）的公海测量精度。我们使用三种不同的对流层绘图函数进行 AMR/GPS 比较，以进行基于 GPS 的估计：Niell、Global 和 Vienna。尽管维也纳映射函数提供了 AMR-GPS 差异最小的方差，但映射函数的选择对我们的结果影响很小。
We use estimates of zenith tropospheric delay from terrestrial Global Positioning System (GPS) stations to validate the wet path-delay measurements from the Jason-2/Ocean Surface Topography Mission (OSTM) Advanced Microwave Radiometer (AMR). We validate the AMR wet path-delay measurements provided in the version “T” Geophysical Data Records (GDRs) and those generated using a recently developed coastal algorithm that will be applied to the version “C” GDRs. The new coastal algorithm reduces the variance of the GPS-AMR differences by as much as 28% within 25 km of land. This algorithm also facilitates open-ocean measurement accuracies as close to land as 15 km (as opposed to 25 km). We perform AMR/GPS comparisons with three different troposphere-mapping functions for the GPS-based estimates: Niell, Global, and Vienna. The choice of mapping function has minimal impact on our results, although the Vienna mapping function provided the smallest variance in the AMR–GPS differences.