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《Engineering of Surveying and Mapping》 2006-06
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The precision analysis of IGS ultra-rapid ephemeris

ZHANG Yao-wen~1,JIA Xiao-lin~2,YANG Zhi-qiang~1(1.College of Geological and Surveying Engineering,Chang'an University,Xi'an 710054,China;2.Xi'an Institute of Surveying and Mapping,Xi'an 710054,China)  
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.
【Fund】: 西安测绘研究所创新资助项目(CX0148)
【CateGory Index】: P228.4
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