Two-way satellite tracking as basis of gravity field misssion scenarios - a simulation study with detailed error analysis II

星间链路可以同时完成三项任务：时间同步、测距和数据传输。这种协同作用将用于地球静止卫星、地球同步卫星和伽利略卫星的星座，以适当地完成所有三项任务。在这一建议中，重力恢复和低地球轨道器的精确轨道确定是重点。在数据传输所确定的范围内，将优化配备卫星间链路的地球静止卫星和伽利略卫星星座，以确定低地球轨道器的轨道。关于可达到的轨道精度的信息将用于重力场恢复的模拟。该项目的第一部分表明，混叠对总错误预算有很大的贡献。在短时间尺度内估计低阶次重力场，可以减小非潮汐误差。这种方法是由Wiese提出的。后续建议将研究在长期研究中对潮汐模式进行共同参数化的可能性。因此，我们提出了一个改进的潮汐模型在这个跟踪星座。该项目的目标是在空间大地测量和时间基准框架内补充重力场恢复的误差树。

Three tasks can be achieved by inter-satellite links at the same time: time synchronization, ranging and data transfer. This synergy shall be used in a constellation of geostationary, geosynchronous and Galileo satellites to appropriately fulfill all three tasks. In this proposal gravity recovery and precise orbit determination of low-Earth orbiters are the focal points. Within boundaries defined by data transfer, the constellation of geostationary and Galileo satellites equipped with inter-satellite links will be optimized for orbit determination of low-Earth orbiters. The information on the achievable orbit accuracies will be used in the simulations of gravity field recovery. The first part of the project showed, that aliasing has a very big contribution to the total error budget. The non-tidal errors can be reduced by estimating gravity fields of low degree and order in a short time scale. This approach is introduced by Wiese. The follow-up proposal will study the possibility of co-parameterization of tidal modes in long-term studies. Therefore we propose an improvement of tidal models in this tracking constellation. The objective of this project is to complement the error tree of gravity field recovery in the framework of GETRIS (geodesy and time reference in space).