Very-long-baseline interferometry (VLBI) networks have historically lacked enough antennas to densify the southern hemisphere adequately. This situation not only impacts directly the realization of the Celestial Reference System but also the determination of the Earth Orientation Parameters (EOP). In the last years, a significant step in the modernization of the VLBI infrastructure has been taken with the VLBI Global Observing System (VGOS). However, the distribution of VGOS antennas is still far from being homogeneous. In this work, we used the software VieSched++ for VLBI scheduling to simulate nine new VGOS arrays. These networks, which are more dense in the southern hemisphere and focus on South America, were planned considering existing geodetic sites where a VGOS antenna could be added and new sites where the installation is feasible. We compared the statistical performance of the proposed networks with that of a simulated standard VGOS network and the actual VGOS performance for the last 2 years. A more uniform station distribution does not seem to be associated with better repeatabilities for station coordinates, but the results for EOP and source coordinates improve as expected.

超长基线干涉测量（VLBI）网络历来缺乏足够的天线来充分密集南半球。这种情况不仅直接影响天参考系的实现，而且影响地球定向参数（EOP）的确定。在过去的几年里，VLBI 全球观测系统（VGOS）在 VLBI 基础设施现代化方面迈出了重要一步。然而，VGOS 天线的分布仍然很不均匀。在这项工作中，我们使用用于VLBI调度的软件VieSched ++来模拟九个新的VGOS阵列。这些网络在南半球更为密集，主要集中在南美洲，在规划时考虑了可以添加 VGOS 天线的现有大地测量站点以及可以安装 VGOS 天线的新站点。我们将所提出的网络的统计性能与模拟的标准 VGOS 网络的统计性能以及过去 2 年的实际 VGOS 性能进行了比较。更均匀的站点分布似乎与更好的站点坐标重复性无关，但 EOP 和源坐标的结果如预期有所改善。