IVS contribution to ITRF2014
IVS contribution to ITRF2014
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DOI：
10.1007/s00190-016-0899-4
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发表时间：
2016-07-01
影响因子：
4.4
通讯作者：
Messerschmitt, Linda
中科院分区：
文献类型：
--
作者：
Bachmann, Sabine;Thaller, Daniela;Messerschmitt, Linda
每隔几年，国际地球自转和参考系统服务（IERS）的国际地球参考系统（ITRS）中心决定生成一个新版本的国际地球参考框架（ITRF）。对于即将到来的ITRF 2014，国际VLBI大地测量和天体测量服务（IVS）的官方贡献包括1979.6至2015.0年的5796个SINEX文件格式的合并会议，总共包含158个站点。在合并过程中，使用了五个不同的软件包，纳入了九个AC贡献。组合解的台站坐标时间序列显示，所有台站的总体重复性为：北部3.3 mm，东部4.3 mm，高度7.5 mm。最小重复率为北部1.5 mm，东部2.1 mm，高度2.9 mm。IVS对ITRF 2014的贡献与常规IVS组合之间的重要区别之一是省略了对非潮汐大气压力载荷（NTAL）的校正。VLBI观测的年信号和NTAL模式的年信号的振幅之间的比较表明，对于一些站，NTAL有很大的影响站的高度变化。对于其他台站，NTAL的影响较小。有时候，其他负荷效应的影响更大（如大陆储水负荷）。VTRF 2014（基于组合VLBI解决方案的TRF），DTRF 2008（ITRS的DGFI-TUM实现）和ITRF 2008之间的尺度参数的外部比较显示了尺度的显着差异。在VTRF 2014和DTRF 2008之间检测到0.11 ppb（即在地球表面上为0.7 mm）的尺度差异，在VTRF 2014和ITRF 2008之间检测到0.44 ppb（即在地球表面上为2.8 mm）的尺度差异。组合解决方案的EOP与AC贡献的单个解决方案之间的内部比较显示，X极和Y极的WRMS在40和100之间，dUT 1在5和15 s之间。与IERS-08-C 04系列的外部比较显示，X极和Y极的WRMS分别为132和143，dUT为13 s。
Every few years the International Terrestrial Reference System (ITRS) Center of the International Earth Rotation and Reference Systems Service (IERS) decides to generate a new version of the International Terrestrial Reference Frame (ITRF). For the upcoming ITRF2014 the official contribution of the International VLBI Service for Geodesy and Astrometry (IVS) comprises 5796 combined sessions in SINEX file format from 1979.6 to 2015.0 containing 158 stations, overall. Nine AC contributions were included in the combination process, using five different software packages. Station coordinate time series of the combined solution show an overall repeatability of 3.3 mm for the north, 4.3 mm for the east and 7.5 mm for the height component over all stations. The minimum repeatabilities are 1.5 mm for north, 2.1 mm for east and 2.9 mm for height. One of the important differences between the IVS contribution to the ITRF2014 and the routine IVS combination is the omission of the correction for non-tidal atmospheric pressure loading (NTAL). Comparisons between the amplitudes of the annual signals derived by the VLBI observations and the annual signals from an NTAL model show that for some stations, NTAL has a high impact on station height variation. For other stations, the effect of NTAL is low. Occasionally other loading effects have a higher influence (e.g. continental water storage loading). External comparisons of the scale parameter between the VTRF2014 (a TRF based on combined VLBI solutions), DTRF2008 (DGFI-TUM realization of ITRS) and ITRF2008 revealed a significant difference in the scale. A scale difference of 0.11 ppb (i.e. 0.7 mm on the Earth's surface) has been detected between the VTRF2014 and the DTRF2008, and a scale difference of 0.44 ppb (i.e. 2.8 mm on the Earth's surface) between the VTRF2014 and ITRF2008. Internal comparisons between the EOP of the combined solution and the individual solutions from the AC contributions show a WRMS in X- and Y-Pole between 40 and 100 as and for dUT1 between 5 and 15 s. External comparisons with respect to the IERS-08-C04 series show a WRMS of 132 and 143 as for X- and Y-Pole, respectively, and 13 s for dUT.