卫星转发器的时延变化

发布时间：2018-12-16 12:10

【摘要】：使用转发式测距观测数据对地球静止轨道(Geostationary orbit,GEO)卫星进行精密定轨时,通常认为卫星转发器时延变化很小,可作为常数和卫星轨道一并求解.事实上这个假定有一定误差,影响了GEO卫星定轨精度.为了研究转发器时延对GEO卫星精密定轨精度的影响,本文对站间单差消除卫星转发器时延与非差常数解算转发器时延两种定轨方案进行了对比.结果发现,转发器时延变化对轨道的影响约为1~2 m.在此基础上,固定差分方法解算的轨道及相关参数,使用非差法反演瞬时转发器时延,结果表明转发器时延变化有明显的周日效应.转发器时延变化规律的发现,为建立GEO卫星定轨精确模型、进一步提高GEO卫星精密定轨以及轨道预报精度具有重要价值.
[Abstract]:When precise orbit determination of geostationary orbit (Geostationary orbit,GEO) satellite is carried out with the data of forward ranging observation, it is generally considered that the delay of satellite transponder is very small and can be solved as a constant and a satellite orbit. In fact, there is a certain error in this assumption, which affects the orbit determination accuracy of GEO satellite. In order to study the influence of transponder delay on the precision of GEO satellite orbit determination, this paper compares two orbit determination schemes: single difference cancellation satellite transponder delay and non-differential constant calculation of transponder delay. It is found that the influence of the transponder delay on the orbit is about 1 ~ 2 m. On this basis, fixed difference method is used to calculate the orbit and related parameters, and the non-difference method is used to retrieve the instantaneous transponder delay. The results show that the variation of the transponder delay has obvious diurnal effect. The discovery of the law of transponder delay is of great value for establishing the precise model of GEO satellite orbit determination and further improving the precision of GEO satellite orbit determination and orbit prediction.
【作者单位】：宇航动力学国家重点实验室;中国科学院国家授时中心;中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;湖北大学商学院;
【基金】：国家自然科学基金(11033004,41104021,41174015) 宇航动力学国家重点实验室开放基金(2012ADL-DW0101) 大地测量与地球动力学国家重点实验室开放基金(SKLGED2013-4-4-E)资助
【分类号】：TN96.1

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