标题： revisit "聚类-聚类"甚长基线干涉测量与未来多波束低频射电干涉仪 显示英文标题

标题： Revisited "Cluster-Cluster" VLBI with future multi-beam low frequency radio interferometers

摘要： 我们从与澳大利亚平方公里阵列探路者（ASKAP）的多波束特性协同作用的角度重新审视了“聚类-聚类”或多视图甚长基线干涉测量（VLBI）技术，并探讨了其提升使用ASKAP进行VLBI观测成果的潜力。 我们列出了一份候选的VLBI站点清单，这些站点位于澳大利亚及海外，已支持或可以升级以支持多视图VLBI，并且与ASKAP具有共同的可见性。 我们之前在1.6 GHz频率下进行的“聚类-聚类”观测结果表明，这种配置能够利用目标附近1到6度范围内的多个校准器，校正导致低频定位精度下降的电离层畸变。 因此，我们得出结论：使用“聚类-聚类”技术联合ASKAP与其他多视图站点进行观测，将提升ASKAP在天文学项目中的高空间分辨率组件的观测成果，实现更多目标的更高精度测量，并降低探测阈值。 此外，非常宽场的VLBI测绘也成为可能。 展望未来，这将有助于开发适用于未来平方公里阵列（SKA）高分辨率观测的新技术。 显示英文摘要

摘要： We revisit the "Cluster-Cluster" or multi-view Very-Long-Baseline-Interferometry (VLBI) technique from the perspective of its synergy with the multi-beam features inherent in the Australian Square Kilometer Array Pathfinder (ASKAP)and its potential to improve the outcomes of VLBI observations with ASKAP. We include a list of candidate VLBI sites that already support or can be upgraded to support multi-view VLBI located in Australia and overseas, and which have common visibility with ASKAP. The results of our previous "cluster-cluster" observations at 1.6 GHz demonstrated the advantages of this configuration to calibrate the ionospheric distortions responsible for the loss of positional accuracy at low frequencies, using multiple calibrators in a range between 1 to 6 degrees away from the target. Therefore, we conclude that joint observations of ASKAP with other multi-view sites using "cluster-cluster" techniques would improve the outcomes of the high spatial resolution component of ASKAP applied to astrometric projects, achieving higher precision for many more targets, and with lower detection thresholds. Also very wide-field VLBI mapping becomes a possibility. Looking to the future, this would contribute to the development of new techniques that are relevant for future high resolution observations with the SKA.