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《Geomatics and Information Science of Wuhan University》 2006-03
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Determination of CHAMP Orbit from Onboard GPS Double-Difference Phase Data with Dynamic Method

GUO Jinyun~(1,2) HWANG Cheinway~(2) HU Jianguo~(3) LI Jiancheng~(4)(1 Department of Territory Information and Surveying Engineering,Xuzhou Normal University,29 Shanghai Road,Tongshan New District,Xuzhou 221116,China)(2 Department of Civil Engineering,National Chiao Tung University,1001 Ta Hsuch Road,Hsingchu 30050,China)(3 Chinese Academy of Surveying and Mapping,16 Beitaiping Road,Beijing 100039,China)(4 School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China)  
In order to determine the CHAMP's orbit,the onboard GPS data of CHAMP,the GPS data of IGS tracking stations,EOP,SGO and time data are necessary.The GPS data should be pre-processed to correct the clock error,solve the ambiguity,detect the cycle slips,determine the satellite attitude,and calculate the antenna phase center offset and correction.Then the air-ground GPS double-difference phase observations are constructed.The CHAMP's orbit is really determined with the dynamic method.Comparing with the PSO from German GFZ,the precision(RMS) in the radial direction is 0.285 7 m.For the 1-day overlapping orbit,the RMS of radial orbit difference is 0.095 8 m.Comparing the orbit endpoints,the mean difference of radial orbit is 0.066 6 m.
【Fund】: 地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(02-09-13);; 山东省重点实验室开放研究基金资助项目(SD2003-4);; FIGFoundation资助项目;; 山东省自然科学基金资助项目(Y2003E01);; 江苏省高校自然科学基金资助项目(05KJB170129)
【CateGory Index】: P228.4
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