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.

该研究单元的目的是通过将几何系统与时间联系起来的高度准确的长期稳定实现，从而证明了通往一致时空的清晰路径。全球参考帧是多种应用的计量基础，从对所有定位任务的变更过程的量化到陆地和空间导航。鉴于这些任务的高社会相关性，联合国于2015年2月26日采用了联合国决议的可持续发展分辨率参考框架（GGRF）。GGRF包括地球的几何形状，地球的重力领域（包括物理高度）和地球的方向以及与天体参考框架相对于地球的方向。该研究部门将为实施这种综合的GGRF提供基本贡献。参考框架的最高精度和长期稳定性对于量化持久趋势（例如海平面变化）至关重要。这些全球参考系统是通过从多种空间大地测量技术中的测量结合来实现的，这些测量方法是在许多全球分布的核心站点（例如地球天文台Wettzell（GOW））和国家航空航天管理（NASA）的集成基础站点（例如，使用地球仪表台）（GOW）和综合基础站（NASA）捆绑在一起。由于本地调查仅指几何而不是实际参考，因此不可避免地会系统错误。我们建议将时间连贯性建立为一种新颖的真实关系，以便从空间测量中的测量结果中消除持续的系统错误。使用公共时钟和地面参考证明并量化了这种新颖的方法，闭合测量值。总而言之，使用该研究单元，我们希望通过引入光学时钟和长距离光纤线的引入时间和频率传递到空间地理位置，空间（ACES）和最后一个新颖的频率分配系统，封闭了整个地理位置。