The contribution of Very Long Baseline Interferometry to ITRF2005
The contribution of Very Long Baseline Interferometry to ITRF2005
复制标题
甚长基线干涉测量对ITRF2005的贡献
DOI：
10.1007/s00190-006-0117-x
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发表时间：
2007
影响因子：
4.4
通讯作者：
A. Nothnagel
中科院分区：
文献类型：
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作者：
M. Vennebusch;S. Böckmann;A. Nothnagel
德国波恩大学大地测量研究所的IVS分析协调办公室计算了国际VLBI测量和天体测量服务（IVS）对ITRF2005（国际地面参考系2005）的贡献。为此目的，IVS分析中心（ACs）为每24小时的观察时段提供无基准的解独立交换（SINEX）格式的正常方程矩阵，并通过堆叠程序逐次组合。在这一过程中，每届会议都考虑到转换为相同参考时期和优先事项的共同参数集，特别是具有代表性的相对权重。为了评估组合IVS文件的质量，从组合正态方程矩阵中导出了地球方向参数（EOPs）和比例因子。两个极运动分量的组合正态方程矩阵的EOPs与单个ac的加权均方根（WRMS）的一致性在50 ~ 60 μas之间，UT1−UTC的EOPs约为3 μs。与国际GNSS服务（IGS）极运动分量的外部比较在130 ~ 170 μas和21 μs/d的水平上。通过IVS SINEX文件实现的地面参考系比例尺在0.2 ppb的水平上与ITRF2000一致。
The contribution of the International VLBI Service for Geodesy and Astrometry (IVS) to the ITRF2005 (International Terrestrial Reference Frame 2005) has been computed by the IVS Analysis Coordinator’s office at the Geodetic Institute of the University of Bonn, Germany. For this purpose the IVS Analysis Centres (ACs) provided datum-free normal equation matrices in Solution INdependent EXchange (SINEX) format for each 24 h observing session to be combined on a session-by-session basis by a stacking procedure. In this process, common sets of parameters, transformed to identical reference epochs and a prioris, and especially representative relative weights have been taken into account for each session. In order to assess the quality of the combined IVS files, Earth orientation parameters (EOPs) and scaling factors have been derived from the combined normal equation matrices. The agreement of the EOPs of the combined normal equation matrices with those of the individual ACs in terms of weighted root mean square (WRMS) is in the range of 50–60 μas for the two polar motion components and about 3 μs for UT1−UTC. External comparisons with International GNSS Serive (IGS) polar motion components is at the level of 130–170 μas and 21 μs/day for length of day (LOD). The scale of the terrestrial reference frame realized through the IVS SINEX files agrees with ITRF2000 at the level of 0.2 ppb.