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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.
When using geostationary orbit (GEO) satellites to perform orbital determinations using reticometric data, it is often assumed that the time delay of the satellite transponder is small and can be solved as a constant with the satellite orbit. In fact, this assumption A certain error, affecting the accuracy of GEO satellite orbit determination.In order to study the influence of transponder delay on the accuracy of GEO satellite orbit determination, this article on the station between the single-antenna satellite repeater delay and non-differential constant solution transponder delay two The results show that the influence of transponder delay on the orbit is about 1 ~ 2 m, on the basis of which the orbit and related parameters of the fixed difference method are solved and the non-difference method is used to invert the instantaneous Repeater delay.The results show that there is a significant sunday effect on transponder delay variation.The discovery of the variation law of transponder delay is very important for establishing the precise orbit determination model of GEO satellite and further improving the precision of orbit prediction and orbit prediction for GEO satellites value.