The increasing importance of terrestrial gravimetry in monitoring global change processes, in providing a reference for satellite measurements and in applications in metrology necessitates a stable reference system reflecting the measurement accuracy achievable by modern gravimeters. Therefore, over the last decade, the International Association of Geodesy (IAG) has developed a system to achieve accurate, homogeneous, long-term global recording of Earth’s gravity, while taking advantage of the potential of today’s absolute gravity measurements. The current status of the International Gravity Reference System and Frame is presented as worked out by the IAG Joint Working Group 2.1.1 “Establishment of a global absolute gravity reference system” during the period 2015–2019. Here, the system is defined by the instantaneous acceleration of free-fall, expressed in the International System of Units (SI) and a set of conventional corrections for the time-independent components of gravity effects. The frame as the systems realization includes a set of conventional temporal gravity corrections which represent a uniform set of minimum requirements. Measurements with absolute gravimeters, the traceability of which is ensured by comparisons and monitoring at reference stations, provide the basis of the frame. A global set of such stations providing absolute gravity values at the microgal level is the backbone of the frame. Core stations with at least one available space geodetic technique will provide a link to the terrestrial reference frame. Expanded facilities enabling instrumental verification as well as repeated regional and additional comparisons will complement key comparisons at the level of the International Committee for Weights and Measures (CIPM) and ensure a common reference and the traceability to the SI. To make the gravity reference system accessible to any user and to replace the previous IGSN71 network, an infrastructure based on absolute gravity observations needs to be built up. This requires the support of national agencies, which are encouraged to establish compatible first order gravity networks and to provide information about existing absolute gravity observations.

中文翻译：

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国际重力参考系统和框架的现状

地面重力测量在监测全球变化过程、为卫星测量提供参考以及在计量学应用中的重要性日益增加，因此需要一个稳定的参考系统，以反映现代重力仪可实现的测量精度。因此，在过去十年中，国际大地测量协会 (IAG) 开发了一种系统，可以实现对地球重力的准确、均匀、长期的全球记录，同时利用当今绝对重力测量的潜力。国际重力参考系统和框架的现状由 IAG 联合工作组 2.1.1“建立全球绝对重力参考系统”在 2015-2019 年期间制定。这里，系统由自由落体的瞬时加速度定义，以国际单位制 (SI) 表示，并针对重力效应的时间无关分量进行了一组常规修正。作为系统实现的框架包括一组传统的时间重力校正，它们代表了一组统一的最低要求。绝对重力仪的测量提供了框架的基础，其可追溯性通过参考站的比较和监测来确保。提供 microgal 级别的绝对重力值的一组全球此类站是框架的支柱。具有至少一种可用空间大地测量技术的核心站将提供与地面参考系的链接。扩大的设施能够实现仪器验证以及重复的区域和额外比较，将补充国际度量衡委员会 (CIPM) 层面的关键比较，并确保对 SI 的共同参考和可追溯性。为了让任何用户都能使用重力参考系统并取代之前的 IGSN71 网络，需要建立基于绝对重力观测的基础设施。这需要国家机构的支持，鼓励它们建立兼容的一阶重力网络并提供有关现有绝对重力观测的信息。为了让任何用户都能使用重力参考系统并取代之前的 IGSN71 网络，需要建立基于绝对重力观测的基础设施。这需要国家机构的支持，鼓励它们建立兼容的一阶重力网络并提供有关现有绝对重力观测的信息。为了让任何用户都能使用重力参考系统并取代之前的 IGSN71 网络，需要建立基于绝对重力观测的基础设施。这需要国家机构的支持，鼓励它们建立兼容的一阶重力网络并提供有关现有绝对重力观测的信息。