【摘要】 在GPS卫星星历中,除了GPS广播星历能被GPS用户实时获取进行实时定位和导航外,IGS超快速星历(IGU星历)有24 h的预推轨道也能被GPS用户实时得到,可以利用IGU星历的预推轨道进行实时定位和导航。文中对IGS发布的IGS超快速星历(IGU星历)预推轨道精度进行了分析。研究表明,随着IGU发布的频度提高,其预推轨道精度也进一步提高,对于每天发布4次的IGU星历,预推轨道的前6 h轨道精度在X、Y、Z方向分别为3.2 cm3、.4 cm、3.2 cm。更多还原

【Abstract】 Among the GPS satellite ephemeris,IGS ultra-rapid ephemeris which have twenty-four hours’ prediction orbit can be obtained momently by GPS user besides GPS broadcasting ephemeris.Thus,IGU ephemeris can be used for navigation and real-time position.The prediction orbit precision of ultra-rapid ephemeris is analyzed,which was issued by IGS.The result shows that the prediction orbit precision is improved with the increase of issue frequentcy. For the IGU ephemeris issued four times in a day,the frontal six hours’ prediction orbit precision is about 3.2?cm,3.4?cm,3.2?cm in each direction.更多还原