论文标题
lofar-vlbi波束上的腐蚀性
Decoherence in LOFAR-VLBI Beamforming
论文作者
论文摘要
我们表明，在lofar-vlbi观测后期创建的后处理中创建的超级巨星（使用干涉阵列的多个站点创建的相位阵列）引入了图像中信号的方向依赖性损失。我们使用仿真和实际数据显示了这种效果。使用RIME形式主义，我们将其充分表征，并给出该信号损失可忽略的限制。最后，我们证明我们能够充分预测这种效果。我们将遵循干涉观察者的指南，以避免他们的观察中这种效果，并讨论可能限制这种效果或完全消除它的技术。如果将其长的基线用于其最大的潜力，那么后者将特别与SKA有关。
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.
