中国物理B ›› 2009, Vol. 18 ›› Issue (8): 3597-3604.doi: 10.1088/1674-1056/18/8/077

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Accurate and rapid error estimation on global gravitational field from current GRACE and future GRACE Follow-On missions

员美娟1, 许厚泽2, 钟敏2, 郑伟3   

  1. (1)Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China; (2)Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China; (3)Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan
  • 收稿日期:2008-11-17 修回日期:2008-12-20 出版日期:2009-08-20 发布日期:2009-08-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 40674038), the Funds of the Chinese Academy of Sciences for Key Topics in Innovation Engineering (Grant Nos KZCX2-YW-143 and KZCX2-YW-202), the National High Technology Research and Development Program of China (863) (Grant Nos 2009AA12Z138 and 2006AA09Z153) and the Grant-in-Aid for Scientific Research of Japan (Grant No B19340129).

Accurate and rapid error estimation on global gravitational field from current GRACE and future GRACE Follow-On missions

Zheng Wei(郑伟)a)b)† , Hsu Hou-Tse(许厚泽)a), Zhong Min(钟敏)a), and Yun Mei-Juan(员美娟)c)   

  1. a Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China; b Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan; c Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China
  • Received:2008-11-17 Revised:2008-12-20 Online:2009-08-20 Published:2009-08-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 40674038), the Funds of the Chinese Academy of Sciences for Key Topics in Innovation Engineering (Grant Nos KZCX2-YW-143 and KZCX2-YW-202), the National High Technology Research and Development Program of China (863) (Grant Nos 2009AA12Z138 and 2006AA09Z153) and the Grant-in-Aid for Scientific Research of Japan (Grant No B19340129).

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摘要： Firstly, the new combined error model of cumulative geoid height influenced by four error sources, including the inter-satellite range-rate of an interferometric laser (K-band) ranging system, the orbital position and velocity of a global positioning system (GPS) receiver and non-conservative force of an accelerometer, is established from the perspectives of the power spectrum principle in physics using the semi-analytical approach. Secondly, the accuracy of the global gravitational field is accurately and rapidly estimated based on the combined error model; the cumulative geoid height error is 1.985× 10-1~m at degree 120 based on GRACE Level 1B measured observation errors of the year 2007 published by the US Jet Propulsion Laboratory (JPL), and the cumulative geoid height error is 5.825× 10^ - 2~m at degree 360 using GRACE Follow-On orbital altitude 250~km and inter-satellite range 50 km. The matching relationship of accuracy indexes from GRACE Follow-On key payloads is brought forward, and the dependability of the combined error model is validated. Finally, the feasibility of high-accuracy and high-resolution global gravitational field estimation from GRACE Follow-On is demonstrated based on different satellite orbital altitudes.

Abstract: Firstly, the new combined error model of cumulative geoid height influenced by four error sources, including the inter-satellite range-rate of an interferometric laser (K-band) ranging system, the orbital position and velocity of a global positioning system (GPS) receiver and non-conservative force of an accelerometer, is established from the perspectives of the power spectrum principle in physics using the semi-analytical approach. Secondly, the accuracy of the global gravitational field is accurately and rapidly estimated based on the combined error model; the cumulative geoid height error is 1.985×10-1 m at degree 120 based on GRACE Level 1B measured observation errors of the year 2007 published by the US Jet Propulsion Laboratory (JPL), and the cumulative geoid height error is 5.825×10-2 m at degree 360 using GRACE Follow-On orbital altitude 250 km and inter-satellite range 50 km. The matching relationship of accuracy indexes from GRACE Follow-On key payloads is brought forward, and the dependability of the combined error model is validated. Finally, the feasibility of high-accuracy and high-resolution global gravitational field estimation from GRACE Follow-On is demonstrated based on different satellite orbital altitudes.

Key words: global gravitational field, GRACE Follow-On, semi-analytical approach, combined error model

中图分类号:  (Nucleic acids)

  • 87.14.G-
87.15.A- (Theory, modeling, and computer simulation)