Spacecraft VLBI and Doppler tracking: algorithms and implementation
Spacecraft VLBI and Doppler tracking: algorithms and implementation
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DOI：
10.1051/0004-6361/201218885
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发表时间：
2012-05-01
影响因子：
6.5
通讯作者：
Bahamon, T. Bocanegra
中科院分区：
文献类型：
--
作者：
Duev, D. A.;Molera Calves, G.;Bahamon, T. Bocanegra
目标。我们介绍了几个以欧空局金星快车航天器为目标进行的多站甚长基线干涉测量(VLBI)实验的结果。为了确定VLBI跟踪太阳系未来行星任务的真实能力，有必要证明该方法对现有作战航天器的准确性。我们描述了处理相位参考近场VLBI观测的软件流水线，并给出了2010-2011年欧空局金星快车航天器观测活动的结果。我们表明，用我们的方法可以高精度地确定航天器状态向量。位置的一致性表明已经实现了0.1 mA的内部均方根精度。然而，系统效应会产生高达1ma的偏移量，但可以通过对对流层和电离层进行更好的建模和更接近的目标校准器配置来减少。
Aims. We present the results of several multi-station Very Long Baseline Interferometry (VLBI) experiments conducted with the ESA spacecraft Venus Express as a target. To determine the true capabilities of VLBI tracking for future planetary missions in the solar system, it is necessary to demonstrate the accuracy of the method for existing operational spacecraft.Methods. We describe the software pipeline for the processing of phase referencing near-field VLBI observations and present results of the ESA Venus Express spacecraft observing campaign conducted in 2010-2011.Results. We show that a highly accurate determination of spacecraft state-vectors is achievable with our method. The consistency of the positions indicates that an internal rms accuracy of 0.1 mas has been achieved. However, systematic effects produce offsets up to 1 mas, but can be reduced by better modelling of the troposphere and ionosphere and closer target-calibrator configurations.