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Physical Explanation on Designing Three Axes as Different Resolution Indexes from GRACE Satellite-Borne Accelerometer |
| ZHENG Wei1,2, XU Hou-Ze1, ZHONG Min1, YUN Mei-Juan3 |
| 1Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 4300772Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan3Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081 |
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| Cite this article: |
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ZHENG Wei, XU Hou-Ze, ZHONG Min et al 2008 Chin. Phys. Lett. 25 4482-4485 |
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Abstract The GRACE Earth's gravitational field complete up to degree and order 120 is recovered based on the same and different three-axis resolution indexes from satellite-borne accelerometer using the improved energy conservation principle. The results show that designing XA1(2) as low-sensitivity axis (3×10-9 m/s2) of accelerometer and designing YA1(2) and ZA1(2) as high-sensitivity axes (3×10-10m/s2) are reasonable. The physical reason why the resolution of XA1(2) is one order of magnitude lower than YA1(2) and ZA1(2) is that non-conservative forces acting on GRACE satellites are mainly decomposed into YA1(2) and ZA1(2) in the orbital plane. Since XA1(2) is not orthogonal accurately to orbital plane during the development of accelerometer, the measurement of XA1(2) can not be thrown off entirely, but be reduced properly
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| Keywords:
91.10.-v
91.10.Fc
91.10.Sp
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Received: 15 May 2008
Published: 27 November 2008
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| PACS: |
91.10.-v
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(Geodesy and gravity)
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91.10.Fc
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(Space and satellite geodesy; applications of global positioning systems)
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91.10.Sp
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(Satellite orbits)
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