The Argentinean–German Geodetic Observatory (AGGO) is a fundamental geodetic observatory located close to the city of La Plata, Argentina. Two high-precision gravity meters are installed at AGGO: the superconducting gravimeter SG038, which is in operation since December 2015, and the absolute gravimeter FG5-227, which has provided absolute gravity measurements since January 2018. By co-location of gravity observations from both meters between January 2018 and March 2019, calibration factor and instrumental drift of the SG038 were determined. The calibration factor of the SG038 was estimated by different strategies: from tidal models, dedicated absolute gravity measurements over several days and a joint approach (including the determination of the instrumental drift) using all available absolute gravity data. The final calibration factor differs from the determination at the previous station, the transportable integrated geodetic observatory, in Concepcion, Chile, by only 0.7‰, which does not imply a significant change. From the combined approach also the mean absolute level of the SG was determined, allowing to predict absolute gravity values from the SG at any time based on a repeatability of 12nm/s2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$12\,\hbox {nm}/\hbox {s}^{2}$$\end{document} for the FG5-227 at AGGO. Such a continuous gravity reference function provides the basis for a comparison site for absolute gravimeters in the frame of the international gravity reference frame for South America and the Caribbean. However, it requires the assessment of the total error budget of the FG5-227, including the link to the international comparisons, which will be subject of future efforts.

中文翻译：

---

阿根廷-德国大地天文台 (AGGO) 的重力参考通过超导和绝对重力测量的协同定位

阿根廷-德国大地天文台 (AGGO) 是一个基本的大地测量天文台，位于阿根廷拉普拉塔市附近。AGGO安装了两台高精度重力仪：2015年12月开始运行的超导重力仪SG038和2018年1月开始提供绝对重力测量的绝对重力仪FG5-227。 2018 年 1 月至 2019 年 3 月期间，两台仪表都确定了 SG038 的校准系数和仪器漂移。SG038 的校准系数是通过不同的策略估计的：从潮汐模型、几天的专用绝对重力测量和使用所有可用绝对重力数据的联合方法（包括仪器漂移的确定）。最终校准系数与前一个站点（位于智利康塞普西翁的可移动综合大地观测站）的测定结果仅相差 0.7‰，这并不意味着发生重大变化。通过组合方法还确定了 SG 的平均绝对水平，允许根据 12nm/s2\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage 的可重复性随时预测 SG 的绝对重力值{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$12\,\hbox { nm}/\hbox {s}^{2}$$\end{document} 用于 AGGO 的 FG5-227。这种连续的重力参考函数为南美洲和加勒比国际重力参考框架中绝对重力仪的比较站点提供了基础。但是，它需要评估 FG5-227 的总错误预算，包括与国际比较的联系，这将是未来努力的主题。