Influence of subdaily polar motion model on nutation offsets estimated by very long baseline interferometry

Influence of subdaily polar motion model on nutation offsets estimated by very long baseline interferometry
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次日极移模型对甚长基线干涉测量章动偏移量的影响

DOI:
10.1007/s00190-017-1039-5
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发表时间:
2017
期刊:
影响因子:
4.4
通讯作者:
Krásná H.
Krásná H.
中科院分区:
地球科学1区
文献类型:
--
作者:
Panafidina N;Hugentobler U;Seitz M;Krásná H.

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本文研究了甚长基线干涉测量(VLBI)观测资料处理中所用的极移亚日模型与章动偏移量估计之间的关系。根据国际地球自转服务组织所接受的惯例,推荐用于大地测量观测日常处理的极移亚日模型不包含任何日逆行项,因为它们与章动一一相关。然而,对于一个24小时VLBI解决方案的一部分,所使用的subdaily模型给出的极移中包含的信号在数值上被误认为是一个逆行的每日恒星信号。这个虚构的逆行每日信号有助于估计章动,导致系统的差异章动偏移与不同的每日极移模型计算的VLBI解决方案。我们证明了这种效果,使用所有合适的24小时VLBI会议在11年的时间跨度(2000-2011年)的解决方案。本文通过改变极移亚日模型中一个潮汐项的振幅,并将估计的参数与用不变亚日模型计算的解进行比较,从理论上说明和解释了各亚日项对VLBI章动估计的影响。
This paper studies the connection between the subdaily model for polar motion used in the processing of very long baseline interferometry (VLBI) observations and the estimated nutation offsets. By convention accepted by the International Earth Rotation Service, the subdaily model for polar motion recommended for routine processing of geodetic observations does not contain any daily retrograde terms due to their one-to-one correlation with the nutation. Nevertheless, for a 24-h VLBI solution a part of the signal contained in the polar motion given by the used subdaily model is numerically mistaken for a retrograde daily sidereal signal. This fictitious retrograde daily signal contributes to the estimated nutation, leading to systematic differences between the nutation offsets from VLBI solutions computed with different subdaily polar motion models. We demonstrate this effect using solutions for all suitable 24-h VLBI sessions over a time span of 11 years (2000–2011). By changing the amplitudes of one tidal term in the underlying subdaily model for polar motion and comparing the estimated parameters to the solutions computed with the unchanged subdaily model, the paper shows and explains theoretically the effects produced by the individual subdaily terms on the VLBI nutation estimates.
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