INFLUENCE OF GEOMETRY AND NUMBER OF IGS STATION ON PRECISE ORBIT DETERMINATION OF GPS NAVIGATION CONSTELLATION
Xiao Changwei 1) ; Yuan Yunbin 1) ; Sheng Chuanzhen 2) ; Wang Yongqian 1) ; and Dong Lina 1)
1)Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077; 2)Institute of Geology, China Earthquake Administration, Beijing 100029
Abstract Oneday, threeday and sevenday orbit solutions of GPS navigation constellation based on the observations of IGS stations in different numbers and geometries from 87day to 95day in 2008 were determined. The final solutions were compared with IGS precise ephemeris. The result shows that the accuracy of oneday, threeday and sevenday orbit solutions could reach up to 4.9 cm, 3.6 cm and 3.4 cm when optimal geometry of the 40 IGS stations are selected. With the increase of IGS stations, the orbit accuracy could not be remarkably improved when the IGS stations have reached a certain limit, but computing time become longer. Thus it is evident that the geometry is the key factor which affects the accuracy of the final solution when the number of IGS stations is fixed.
Xiao Changwei ,Yuan Yunbin ,Sheng Chuanzhen et al. INFLUENCE OF GEOMETRY AND NUMBER OF IGS STATION ON PRECISE ORBIT DETERMINATION OF GPS NAVIGATION CONSTELLATION[J]. , 2012, 32(2): 47-50.
Xiao Changwei ,Yuan Yunbin ,Sheng Chuanzhen et al. INFLUENCE OF GEOMETRY AND NUMBER OF IGS STATION ON PRECISE ORBIT DETERMINATION OF GPS NAVIGATION CONSTELLATION[J]. jgg, 2012, 32(2): 47-50.
