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Consistent celestial and terrestrial reference frames by improved modelling and combination

通过改进的建模和组合实现一致的天体和地面参考系

基本信息

批准号：
199892083
负责人：
Dr.-Ing. Detlef Angermann
金额：
--
依托单位：
Deutsches Geodätisches Forschungsinstitut
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/199892083?language=en
关键词：
Consistent celestial terrestrial reference frames

项目摘要

The goal of this project is to deliver a celestial reference frame (CRF), a terrestrial reference frame (TRF), and the corresponding Earth orientation parameters (EOPs) with highest possible consistency based on improved modelling of the space geodetic observations and on the development and application of advanced combination methods. The combination of the homogeneously processed VLBI, SLR and GNSS observation time series to derive those reference frames will be performed by applying two different approaches: a) on the level of observation equations (at BKG), and b) on the level of constraint-free normal equations (at DGFI). Both institutions will compute epoch reference frames by combining the different space geodetic techniques on a weekly basis, in addition to the computation of long-term multi-year reference frames. Thereby, BKG generates solutions with suitable geophysical fluid models consistently applied, and the impact of the latter on the reference frame results will be studied. BKG will also develop improved combination methods for a consistent TRF and EOP estimation by including satellite co-locations, i.e., by additionally using SLR observations to GNSS satellites. DGFI will apply the extended parameterization of non-linear station motions for long-term reference frame computations and will generate consistent results for CRF, TRF and EOPs. The different strategies and reference frame results will be compared with each other and with external solutions provided by the IERS. Finally, the results of this project shall allow to assess the gain of the improved combination methods for TRF, CRF and EOP compared to standard IERS approaches.

该项目的目标是在改进的空间大地观测模型和开发和应用先进的组合方法的基础上，以尽可能高的一致性提供一个天文参照系、一个地球参照系和相应的地球定向参数。将采用两种不同的方法，将经均匀处理的VLBI、SLR和全球导航卫星系统观测时间序列组合起来，以得出这些参考帧：a)在观测方程一级(在BKG)，b)在无约束法方程一级(在DGFI)。这两个机构除了计算长期多年参考框架外，还将每周结合不同的空间大地测量技术来计算纪元参考框架。因此，BKG在一致应用合适的地球物理流体模型的情况下生成解，并将研究后者对参考框架结果的影响。BKG还将开发改进的组合方法，通过纳入卫星共同定位，即另外使用全球导航卫星系统卫星的SLR观测，来实现一致的TRF和EOP估计。DGFI将为长期参考系计算应用扩展的非线性站运动参数化，并将为CRF、TRF和EOPS生成一致的结果。将对不同的战略和参照框架结果进行相互比较，并与IERS提供的外部解决方案进行比较。最后，本项目的结果将允许评估与标准的IERS方法相比，改进的TRF、CRF和EOP组合方法的收益。