使用精确的UV移位，在整个初级射束中进行VLBI成像
VLBI imaging throughout the primary beam using accurate UV shifting
摘要：
对于甚长基线干涉测量（VLBI），条纹间距与每个元件的主光束所施加的视场相比非常窄。这意味着一次观测可以潜在地对极大量的分辨率单位进行成像。我们实现和测试的技术，高效，准确地成像大型VLBI数据集。DiFX软件相关器用于生成具有极高时间和频率分辨率的数据集。然后，对这个大数据集进行多次变换和平均，以生成许多较小的数据集，每个数据集的相位中心位于不同的感兴趣区域。给出了一个8.4 GHz四站VLBI观测的多源场的结果。校准器3C345的观测结果用于移位算法准确性的初步测试。高精度的实现，使该方法适用于最苛刻的天体测量VLBI观测。一个目标源（1320+ 299 A）被检测到，并被用作相位参考校准器，以寻找进一步的检测。包含130亿像素的图像是通过对覆盖阵列的整个初级光束的782个可见度数据集进行独立成像而构建的。讨论了该算法的当前实现和在VLBI数据分析中可能的未来发展。
英文摘要：
For Very Long Baseline Interferometry (VLBI), the fringe spacing is extremely narrow compared to the field of view imposed by the primary beam of each element. This means that an extremely large number of resolution units can potentially be imaged from a single observation. We implement and test a technique for efficiently and accurately imaging large VLBI datasets. The DiFX software correlator is used to generate a dataset with extremely high time and frequency resolution. This large dataset is then transformed and averaged multiple times to generate many smaller datasets, each with a phase centre located at a different area of interest. Results of an 8.4 GHz four-station VLBI observation of a field containing multiple sources are presented. Observations of the calibrator 3C345 were used for preliminary tests of accuracy of the shifting algorithm. A high level of accuracy was achieved, making the method suitable even for the most demanding astrometric VLBI observations. One target source (1320+299A) was detected and was used as a phase-reference calibrator in searching for further detections. An image containing 13 billion pixels was constructed by independently imaging 782 visibility datasets covering the entire primary beam of the array. Current implementations of this algorithm and possible future developments in VLBI data analysis are discussed.
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