GGOS-D: homogeneous reprocessing and rigorous combination of space geodetic observations
GGOS-D: homogeneous reprocessing and rigorous combination of space geodetic observations
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GGOS-D：空间大地测量观测的均质再处理和严格组合
DOI：
10.1007/s00190-011-0475-x
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发表时间：
2011
影响因子：
4.4
通讯作者：
Thaller D.
中科院分区：
文献类型：
--
作者：
Rothacher M;Angermann D;Artz T;Bosch W;Drewes H;Boeckmann S;Gerstl M;Keim R;Koenig D;Koenig R;Meisel B;Mueller H;Nothnagel A.. Panafidina N;Richter B;Rudenko S;Schwegmann W;Seitz M;Steigenberger P;Tesmer V;Thaller D.
在为实现全球大地测量系统 (GGOS) 计划的活动做准备时，一组德国科学家开展了一项缩写为 GGOS-D 的研究，该研究与 GGOS 倡议背后的想法非常相似。 GGOS-D项目的目标是研究全球大地测量-地球物理观测系统的方法和信息技术实现，特别是空间大地测量观测的集成和组合。在该项目过程中，基于通用的最先进的建模和参数化标准生成了高度一致的 GPS、VLBI 和 SLR 结果时间序列。然后将这些系列组合起来，一致、准确地计算地球参考系 (TRF)。该 TRF 随后被用作生成台站坐标、地球方向和对流层参数的时间序列的基础。在本出版物中，我们介绍了用于整合空间大地测量观测的处理算法和策略的结果，这些算法和策略是在 GGOS-D 项目中开发的，作为全球大地测量观测系统的数据处理和处理部分的原型或小型有限版本。通过 GGOS-D 地面参考系结果与 ITRF2005 的比较，基准参数的位置精度约为 5-7 毫米，速率精度约为 1.0-1.5 毫米/年。站点位置的残差约为 3 毫米，站点速度的残差在 0.5 至 1.0 毫米/年之间。应用 GGOS-D TRF，极移时间序列与 GPS 和 VLBI 的偏移量减少至 50μas（相当于地球表面的 1.5 毫米）。对于对流层参数时间序列，本研究中大多数站的同位 VLBI 和 GPS 观测的总天顶延迟估计值的偏移小于 1.5 毫米。与单独的 VLBI (109.0/100.7μas) 或 GPS (98.0/99.5μas) 相比，组合极移分量与 IERS 05C04 系列 (96.0/96.0μas) 的 WRMS 一致性明显更好。估计参数的时间序列尚未被组合和利用到可能的程度。然而，这里提出的结果表明，GGOS-D 项目取得的经验对于作为 GGOS 开发一部分的国际水平上的类似开发非常有价值。
In preparation of activities planned for the realization of the Global Geodetic Observing System (GGOS), a group of German scientists has carried out a study under the acronym GGOS-D which closely resembles the ideas behind the GGOS initiative. The objective of the GGOS-D project was the investigation of the methodological and information-technological realization of a global geodetic-geophysical observing system and especially the integration and combination of the space geodetic observations. In the course of this project, highly consistent time series of GPS, VLBI, and SLR results were generated based on common state-of-the-art standards for modeling and parameterization. These series were then combined to consistently and accurately compute a Terrestrial Reference Frame (TRF). This TRF was subsequently used as the basis to produce time series of station coordinates, Earth orientation, and troposphere parameters. In this publication, we present results of processing algorithms and strategies for the integration of the space-geodetic observations which had been developed in the project GGOS-D serving as a prototype or a small and limited version of the data handling and processing part of a global geodetic observing system. From a comparison of the GGOS-D terrestrial reference frame results and the ITRF2005, the accuracy of the datum parameters is about 5–7 mm for the positions and 1.0–1.5 mm/year for the rates. The residuals of the station positions are about 3 mm and between 0.5 and 1.0 mm/year for the station velocities. Applying the GGOS-D TRF, the offset of the polar motion time series from GPS and VLBI is reduced to 50μas (equivalent to 1.5 mm at the Earth’s surface). With respect to troposphere parameter time series, the offset of the estimates of total zenith delays from co-located VLBI and GPS observations for most stations in this study is smaller than 1.5 mm. The combined polar motion components show a significantly better WRMS agreement with the IERS 05C04 series (96.0/96.0μas) than VLBI (109.0/100.7μas) or GPS (98.0/99.5μas) alone. The time series of the estimated parameters have not yet been combined and exploited to the extent that would be possible. However, the results presented here demonstrate that the experiences made by the GGOS-D project are very valuable for similar developments on an international level as part of the GGOS development.
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