Universal time from VLBI single-baseline observations during CONT08
Universal time from VLBI single-baseline observations during CONT08
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DOI：
10.1007/s00190-010-0436-9
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发表时间：
2011-07-01
影响因子：
4.4
通讯作者：
Schuh, Harald
中科院分区：
文献类型：
--
作者：
Nilsson, Tobias;Boehm, Johannes;Schuh, Harald
IVS密集会议是单基线，每天进行1小时VLBI会议，以确定世界时（UT1）。我们调查不同的可能性，以改善这种会议的结果。我们通过从CONT08数据集中提取2小时单基线会话来进行这项调查。这些都像正常的强度分析，并将结果与完整的CONT08数据集的分析结果进行比较。我们发现对流层不对称性是单基线会话的主要误差来源。可以通过使用精确的先验对流层梯度或通过在数据分析中估计梯度来提高所估计的UT 1的精度。
The IVS Intensive sessions are single-baseline, 1-h VLBI sessions carried out everyday in order to determine Universal Time (UT1). We investigate different possibilities to improve the results of such sessions. We do this investigation by extracting 2-h single-baseline sessions from the CONT08 data set. These are analysed like normal Intensives, and the results are compared to the results of the analysis of the full CONT08 data set. We find that tropospheric asymmetry is the major error source for the single-baseline sessions. It is possible to improve the accuracy of the estimated UT1 either by using accurate a priori tropospheric gradients or by estimating gradients in the data analysis.