Towards an Improved Assessment of the Quality of Terrestrial Reference Frames
Towards an Improved Assessment of the Quality of Terrestrial Reference Frames
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改进地面参考系质量评估
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
V. Tesmer
中科院分区：
文献类型：
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作者：
H. Kutterer;M. Krügel;V. Tesmer
目前，通过综合分析VLBI、GPS、SLR、DORIS等空间大地测量技术获得地球参考框架(TRF)是一种常见的做法。各种验证和交叉核对计算表明，国际地球参考框架(ITRF)最近的解决方案在几毫米范围内高度一致。然而，有几个因素限制了技术内和技术间组合的质量，如使用不同的参数、相同物理效果的不同校正模型、稳定或正则化的个别限制，或低质量的局部联系。此外，从数学的角度来看，并非所有的应用分析程序都是严格的。这主要是因为基于相同观测数据的技术内解决方案被认为是独立的。由于技术内组合解的正态方程或方差-协方差矩阵被用于技术间组合的加权(因此对于最终产品“参照系”)，迫切需要专门的研究。
Today it is common practice to derive terrestrial reference frames (TRF) by the combined analysis of the following space-geodetic techniques: VLBI, GPS, SLR, DORIS. Various validations and cross-check calculations show a high consistency in the range of a few millimetres for recent solutions of the International Terrestrial Reference Frame (ITRF). However, several factors limit the quality of intra-technique and inter-technique combinations such as the use of different parameterizations, different correction models for the same physical effects, individual constraints for stabilization or regularization, or low-quality local ties. In addition, not all applied analysis procedures are rigorous from a mathematical point of view. This is mainly due to the fact that intra-technique solutions which are based on identical observation data are considered as independent. As the normal equations or the variance-covariance matrices of the intra-technique combined solutions are used for the weighting of the inter-technique combinations (and thus for the final product ‘reference frame’) a dedicated study is urgently required.