Coordination Funds

协调基金

• 批准号: 513052344
• 负责人: Professor Dr.-Ing. Ulrich Schreiber
• 金额: --
• 依托单位: Professur für Satellitengeodäsie
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/513052344?language=en
• 关键词: Coordination; Funds

The goal of this research unit is a highly accurate long-term stable realization of the geodetic reference systems by linking the geometric systems to time, thus demonstrating a clear path towards a consistent realization of space-time. Global reference frames are the metrological basis for a multitude of applications, reaching from the quantification of change processes in system Earth over all positioning tasks to terrestrial and space navigation. In view of the high societal relevance of these tasks, the United Nations adopted the UN resolution Global Geodetic Reference Frame for Sustainable Development (GGRF) on February 26, 2015. The GGRF includes the geometry, the gravity field of the Earth (including physical heights) and the orientation of the Earth with respect to the celestial reference frame. This research unit will provide fundamental contributions to the implementation of such an integrated GGRF. Highest accuracy and long-term stability of the reference frame are of paramount importance for the quantification of long-lasting trends, such as sea level changes. These global reference systems are realized by the combination of measurements from a diversity of space geodetic techniques, tied together employing geodetic local surveys at a number of globally distributed core stations, such as the Geodetic Observatory Wettzell (GOW) and the integrated fundamental stations of the National Aeronautics and Space Administration (NASA). Since the local surveys only refer to the geometric but not to the actual reference, systematic errors are inevitable. We propose to establish time coherence as a novel true tie in order to also remove persisting systematic errors from the measurements in space geodesy. Closure measurements utilizing a common clock and ground reference proof and quantify this novel approach. In summary, with this research unit we want to exploit the great opportunity that is presented by the introduction of optical clocks and long distance optical fiber lines for time and frequency transfer to space geodesy, the utilization of the Atomic Clock Ensemble in Space (ACES) and last but not least a novel time and frequency distribution system, enclosing an entire geodetic observatory.

该研究单位的目标是通过将几何系统与时间联系起来，高度准确地长期稳定地实现大地测量参考系统，从而为实现时空一致性指明一条明确的道路。全球参照基准是许多应用的基础，从量化地球系统中所有定位任务的变化过程到陆地和空间导航。鉴于这些任务的高度社会相关性，联合国于2015年2月26日通过了联合国可持续发展全球大地测量参考框架（GGRF）决议。GGRF包括地球的几何形状、重力场（包括物理高度）以及地球相对于天体参考系的方向。这一研究单位将为实施这样一个综合的全球治理框架作出根本性贡献。参考框架的最高准确度和长期稳定性对于量化海平面变化等长期趋势至关重要。这些全球参照系统是通过将各种空间大地测量技术的测量结果结合起来实现的，这些测量结果是在全球分布的一些核心站，如大地测量观测台Wettzell（GOW）和美国国家航空航天局（美国航天局）的综合基本站，采用大地测量当地测量结合在一起实现的。由于局部测量仅参考几何而不参考实际参考，系统误差是不可避免的。我们建议建立时间相干性作为一种新的真正的领带，以消除持续存在的系统误差的测量空间大地测量。闭合测量利用一个共同的时钟和地面参考证明和量化这种新的方法。总之，通过这个研究单位，我们希望利用引入光学时钟和长距离光纤线路来进行空间大地测量的时间和频率传输所带来的巨大机会，利用空间原子钟（ACES）以及最后但并非最不重要的一个新颖的时间和频率分配系统，包围整个大地测量观测站。