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《Progress in Geophysics》 2007-01
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GPS-based reduced-dynamic orbit determination for gravity field revovery

HAN Bao-min1,3,XU Hou-ze2(1.School of Architecture and Engineering,Shandong University of Technology,Zibo 255049,China;2.Key Laboratory of Dynamical Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences, Wuhan 430077,China;3.Xi'an Research Institute of S urveying & Mapping,Xi'an 710054,China)  
Precise satellite orbit determination is a first prerequisite for gravity field recovery and measuring its variations in time.On the other hand,the precision gravity model is important guarantees for obtaining high precision orbiting results using the dynamic or reduced-dynamic orbit determination method.The paper briefly discussed the mathematical model of gravity recovery based on the energy conservation law and model of reduced-dynamic orbit determination,than analyzed and compared existing gravity models.At last,the impacts of different order and different gravity models on the orbit determination accuracy were systematically studied and compared with the real GPS observations from onboard receiver on CHAMP satellite,and the impacts of different predefined interval pseudo-stochastic velocity pulses on absorbing and adjusting the un-modeled dynamic force errors were also analyzed.The results show that the selection of proper order,right gravity model and appropriate predefined interval pseudo-stochastic pulses can not only boost the computational efficiency but also greatly improve the accuracy of orbit determination.
【Fund】: 国家自然科学基金项目(40474001 40204001);; 山东省基础地理信息与数字化技术重点实验室开放基金项目(SD040209);; 山东理工大学科研基金项目(2004KJM11)联合资助
【CateGory Index】: P312
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