The application of time in closure as a novel strategy towards error-free space geodeticobservations

闭合时间作为无误差空间大地测量观测的新策略的应用

• 批准号: 513268138
• 负责人: Dr.-Ing. Mathis Bloßfeld
• 金额: --
• 依托单位: Deutsches Geodätisches Forschungsinstitut
• 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/513268138?language=en
• 关键词: application; time; closure; novel; strategy

This project is the closest to the outlined concept of the clock tweezers as given in the cover application of this research unit. The project closely cooperates with several other projects of the research unit, namely P1, P5, P6, P8, P9 and P10. This highlights the central role of the project for the whole research unit. It aims at different foci for the improvement of space-geodetic techniques by exploiting the common space-time reference point, realized at GOW. The overall goal of the project is the identification and minimization of measurement errors and the development of calibration procedures applicable in routine operations. In addition, the separation of observation errors and atmospheric delays is envisaged. The accuracy provided by the techniques today still suffers from a combination of unknown systematic instrumental and model errors. In a first step, the already existing closure measurements for SLR and VLBI are revisited to identify, extract and resolve the hidden biases. Afterwards, together with the team at GOW we will design, conduct and analyse further measurements in order to come up with the best strategy for the mitigation of systematic errors, based on clock ties. DORIS does not directly depend on the ground clock and GNSS will eventually have an independent calibration via a pseudolite. This requires a different analysis strategy compared to SLR and VLBI. The reliable identification and extraction of the variable systematic errors based on clock ties are central. Finally, corrected (calibrated) observations are provided to other projects of the research unit (P9 and P10) for the inter-technique combination. This project strongly contributes to the technical redesign of the station fiducial marker as a role model for a possible future GGOS core station requirement and validates its performance.

这个项目是最接近的概述概念的时钟镊子，因为在封面申请本研究单位。该项目与研究单位的其他几个项目密切合作，即P1，P5，P6，P8，P9和P10。这突出了该项目对整个研究单位的核心作用。它旨在通过利用在GOW实现的共同时空参考点，针对不同的焦点改进空间大地测量技术。该项目的总体目标是识别和最大限度地减少测量误差，并制定适用于日常操作的校准程序。此外，还设想将观测误差和大气延迟分开。今天的技术提供的准确性仍然受到未知的系统仪器和模型误差的组合。在第一步中，已经存在的SLR和VLBI的封闭测量重新访问，以识别，提取和解决隐藏的偏见。之后，我们将与GOW的团队一起设计、执行和分析进一步的测量，以便根据时钟关系提出减轻系统误差的最佳策略。DORIS不直接依赖于地面时钟，GNSS最终将通过伪卫星进行独立校准。与SLR和VLBI相比，这需要不同的分析策略。基于钟联的可变系统误差的可靠识别和提取是核心。最后，将校正（校准）的观测值提供给研究单位的其他项目（P9和P10）进行技术间组合。该项目极大地促进了台站基准标志的技术重新设计，作为未来全球地球观测系统核心台站可能要求的一个作用模型，并验证了其性能。