LOFAR-VLBI波束形成中的去相干
Decoherence in LOFAR-VLBI Beamforming
摘要：
我们表明，使用一个超级站（使用多个站的干涉阵列的相控阵列）创建LOFAR-VLBI观测后处理中引入了一个方向相关的图像中的信号损失。我们使用模拟和真实数据显示这种效果。使用的RIME形式主义，我们充分，并给出限制下，这种信号损失可以忽略不计。最后，我们证明了我们能够完全预测这种影响。最后，我们的指导方针，干涉观测，以避免这种影响，在他们的意见，并讨论的技术，可以限制这种影响或完全消除它。如果科学知识评估的长基线得到最充分的利用，后者尤其与科学知识评估有关。
英文摘要：
We show that the use of a superstation (a phased array created using multiple stations of an interferometric array) created in post-processing for LOFAR-VLBI observations introduces a direction-dependent loss of signal in the image. We show this effect using simulations and real data. Using the RIME formalism, we characterise it fully, and give limits under which this signal loss is negligible. Finally, we show that we are able to fully predict this effect. We close with guidelines for interferometric observers to avoid this effect in their observations, and a discussion of techniques which could limit this effect or do away with it entirely. The latter in particular will be relevant to the SKA should its long baselines be used to their fullest potential.
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