CONT17 is an observation campaign of continuous Very Long Baseline Interferometry (VLBI) sessions for a period of 15 days, carried out by the International VLBI Service for Geodesy and Astrometry (IVS). This campaign represents an interesting opportunity for the inter-comparison of space geodetic techniques given that they share the same observability conditions in co-located sites. In this work, VLBI estimates of Earth orientation parameters (EOP), station coordinates and troposphere—zenith total delays (ZTD) and gradients—are compared to those estimated by means of Global Navigation Satellite Systems (GNSS) observations. We considered solutions from different software packages and processing techniques for this analysis, including all the available IVS and IGS (International GNSS Service) solutions and two VLBI series obtained by the authors. This extensive analysis provides a representative view of the inter-technique differences under the same observation conditions. We considered in the analysis the two VLBI legacy S/X networks that took part in the CONT17 campaign. We found that the EOP WRMS with respect to IGS final products is similar to previous CONT campaigns, even using global VLBI solutions that assimilate the data from both CONT17 legacy-1 and legacy-2 networks. Repeatabilities of estimated VLBI antenna coordinates of the legacy-1 network have a similar behaviour than GNSS-based repeatabilities in east and north components and slightly worse in up component whereas the repeatabilities of the legacy-2 network are smaller than legacy-1 network and similar to the IGS combined solution. Finally, troposphere inter-technique differences in terms of ZTD and gradients also show a similar agreement to different sources of GNSS-based troposphere estimates.

CONT17 是一项为期 15 天的连续甚长基线干涉测量 (VLBI) 观测活动，由国际大地测量和天体测量 (IVS) VLBI 服务机构开展。鉴于空间大地测量技术在同一地点具有相同的可观测性条件，因此该活动为空间大地测量技术的相互比较提供了一个有趣的机会。在这项工作中，将地球定向参数 (EOP)、台站坐标和对流层——天顶总延迟 (ZTD) 和梯度的 VLBI 估计值与通过全球导航卫星系统 (GNSS) 观测值估计的值进行了比较。我们为该分析考虑了来自不同软件包和处理技术的解决方案，包括所有可用的 IVS 和 IGS（国际 GNSS 服务）解决方案以及作者获得的两个 VLBI 系列。这种广泛的分析提供了相同观察条件下技术间差异的代表性视图。我们在分析中考虑了参与 CONT17 活动的两个 VLBI 传统 S/X 网络。我们发现，关于 IGS 最终产品的 EOP WRMS 与之前的 CONT 活动相似，甚至使用全球 VLBI 解决方案，同化来自 CONT17 legacy-1 和 legacy-2 网络的数据。传统 1 网络的估计 VLBI 天线坐标的重复性在东部和北部组件具有与基于 GNSS 的重复性相似的行为，在向上组件中略差，而传统 2 网络的可重复性小于传统 1 网络和类似的到 IGS 组合解决方案。最后，