天极偏移模拟对VLBI UT1密集结果的影响
The impact of celestial pole offset modelling on VLBI UT1 Intensive results
摘要：
甚长基线干涉测量（VLBI）密集会议计划提供业务世界时（UT 1）确定与低延迟。从这些观测中获得的UT 1估计值在很大程度上取决于数据处理过程中使用的天极运动模型。然而，即使是最精确的岁差章动模型，IAU 2000/2006，也不足以实现VLBI观测的全部潜力。为了在UT 1估计中实现尽可能高的精度，应应用天极偏移（CPO），即实际岁差章动角与模拟岁差章动角之间的差值。目前有三种CPO模型可供用户使用。在本文中，这些模型进行了测试和UT 1估计与这些模型之间的差异进行了研究。结果表明，在VLBI UT 1密集处理过程中忽略CPO建模，将导致UT 1系列的系统误差高达20微弧秒。还发现，使用不同的CPO模型导致UT 1估计值的差异达到10微弧秒。所得结果同样适用于卫星数据处理。
英文摘要：
Very Long Baseline Interferometry (VLBI) Intensive sessions are scheduled to provide operational Universal Time (UT1) determinations with low latency. UT1 estimates obtained from these observations heavily depend on the model of the celestial pole motion used during data processing. However, even the most accurate precession-nutation model, IAU 2000/2006, is not accurate enough to realize the full potential of VLBI observations. To achieve the highest possible accuracy in UT1 estimates, a celestial pole offset (CPO), which is the difference between the actual and modelled precession-nutation angles, should be applied. Three CPO models are currently available for users. In this paper, these models have been tested and the differences between UT1 estimates obtained with those models are investigated. It has been shown that neglecting CPO modelling during VLBI UT1 Intensive processing causes systematic errors in UT1 series of up to 20 microarcseconds. It has been also found that using different CPO models causes the differences in UT1 estimates reaching 10 microarcseconds. Obtained results are applicable to the satellite data processing as well.
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