%0 Journal Article
%T INFLUENCE OF GEOMETRY AND NUMBER OF IGS STATION ON PRECISE ORBIT DETERMINATION OF GPS NAVIGATION CONSTELLATION<br>IGS站的几何结构与数量对GPS导航星座精密轨道确定的影响分析
%A Xiao Changwei
%A Yuan Yunbin
%A Sheng Chuanzhen
%A Wang Yongqian
%A Dong Lina
%A <br>肖长伟
%A 袁运斌
%A 盛传贞
%A 王永乾
%A 董丽娜
%J 大地测量与地球动力学
%D 2012
%I 
%X One-day,three-day and seven-day orbit solutions of GPS navigation constellation based on the observations of IGS stations in different numbers and geometries from 87-day to 95-day in 2008 were determined.The final solutions were compared with IGS precise ephemeris.The result shows that the accuracy of one-day,three-day and seven-day 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.
%K GPS
%K navigation constellation
%K precise orbit
%K geometry
%K IGS station<br>GPS
%K 导航星座
%K 精密轨道
%K 几何结构
%K IGS站
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=DA72A78627FE64EAA572951EA05D274A&jid=73A1A428591E600EF664B596512A2997&aid=28538CA98C30007817AFF33174694650&yid=99E9153A83D4CB11&vid=9971A5E270697F23&iid=0B39A22176CE99FB&sid=F4B561950EE1D31A&eid=771152D1ADC1C0EB&journal_id=1671-5942&journal_name=大地测量与地球动力学&referenced_num=0&reference_num=0