Variation of satellite transponder delay  

作　　者：Jihua Liu Zhigang Li Xuhai Yang Jikun Ou Shiming Zhong Baoqi Sun Jiasong Wang Yao Kong Zhanke He 

机构地区：[1]State Key Laboratory of Astronautic Dynamics [2]National Time Service Center,Chinese Academy of Sciences [3]State Key Laboratory of Geodesy and Earth’s Dynamics,Institute of Geodesy and Geophysics,Chinese Academy of Sciences [4]School of Business,Hubei University

出　　处：《Chinese Science Bulletin》2014年第21期2568-2573,共6页

基　　金：supported by the National Natural Science Foundation of China (11033004,41104021 and 41174015);the Open Foundation of State Key Laboratory of Astronautic Dynamics (2012ADL-DW0101);the Open Foundation of State Key Laboratory of Geodesy and Earth’s Dynamics (SKLGED2013-4-4-E)

摘　　要：For precise orbit determination of geosynchronous earth orbit(GEO)satellites using transfer ranging observations,it is generally assumed that the variation of the satellite transponder delay is very small and that it can be solved as a constant parameter together with satellite orbit parameters.However,this assumption is too general and it reduces the accuracy of orbit determination for GEO satellites.To study and analyse the impact of the satellite transponder delay on GEO satellites orbit determination,two schemes were proposed.First,the satellite transponder delay was eliminated by forming single-difference observations between two ground stations;second,the satellite transponder delay was described as a constant parameter.The preliminary results demonstrate a difference of about1–2 m between the two schemes when used for precise orbit determination of GEO satellites.By fixing the GEO satellite orbit and other relevant parameters estimated by single-difference model,we inversed the instantaneous transponder delay from non-difference observation.It was found that the satellite transponder delay has a distinct diurnal variation,with an amplitude of 3–4 m.The findings of this paper are helpful in establishing an accurate model of satellite transponder delay and in improving the accuracy of GEO satellites orbit determinations and predictions.For precise orbit determination of geosyn- chronous earth orbit （GEO） satellites using transfer ranging observations, it is generally assumed that the variation of the satellite transponder delay is very small and that it can be solved as a constant parameter together with satellite orbit parameters. However, this assumption is too general and it reduces the accuracy of orbit determination for GEO satellites. To study and analyse the impact of the satellite transponder delay on GEO satellites orbit determination, two schemes were proposed. First, the satellite transponder delay was eliminated by forming single-difference observations between two ground stations; second, the satellite transponder delay was described as a constant parameter. The preliminary results demonstrate a difference of about 1-2 m between the two schemes when used for precise orbit determination of GEO satellites. By fixing the GEO satellite orbit and other relevant parameters estimated by single-difference model, we inversed the instantaneous transponder delay from non-difference observation. It was found that the satellite transponder delay has a distinctdiurnal variation, with an amplitude of 3-4 m. The findings of this paper are helpful in establishing an accurate model of satellite transponder delay and in improving the accuracy of GEO satellites orbit determinations and predictions.

关 键 词：卫星转发器 时延变化 地球静止轨道卫星 精密定轨 轨道确定 模型估算 GEO 地球轨道 

分 类 号：V474[航空宇航科学与技术—飞行器设计]