National Geographic Institute of Spain, General Ibañez de Ibero 3, E-28003 Madrid, Spain.
Department Section of Astronomy and Geodesy, Faculty of Mathematics, University Complutense of Madrid, E-28040 Madrid, Spain.
Sensors (Basel). 2021 Dec 10;21(24):8276. doi: 10.3390/s21248276.
Very long baseline interferometry (VLBI) is the only technique in space geodesy that can determine directly the celestial pole offsets (CPO). In this paper, we make use of the CPO derived from global VLBI solutions to estimate empirical corrections to the main lunisolar nutation terms included in the IAU 2006/2000A precession-nutation model. In particular, we pay attention to two factors that affect the estimation of such corrections: the celestial reference frame used in the production of the global VLBI solutions and the stochastic model employed in the least-squares adjustment of the corrections. In both cases, we have found that the choice of these aspects has an effect of a few μas in the estimated corrections.
甚长基线干涉测量 (VLBI) 是空间大地测量学中唯一能够直接确定天极偏移量 (CPO) 的技术。在本文中，我们利用从全球 VLBI 解算中得出的 CPO 来估计包含在 IAU 2006/2000A 岁差章动模型中的主要日月引力摄动项的经验修正值。特别是，我们关注了影响这些修正值估计的两个因素：用于生成全球 VLBI 解算的天球参考框架以及在修正值最小二乘调整中采用的随机模型。在这两种情况下，我们发现这些方面的选择对估计的修正值有几微角秒的影响。
