Accurate and rapid error estimation on global gravitational field from current GRACE and future GRACE Follow-On missions |
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Authors: | Zheng Wei Hsu Hou-Tse Zhong Min and Yun Mei-Juan |
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Affiliation: | 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; Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China |
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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. |
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Keywords: | global gravitational field GRACE Follow-On semi-analytical approach combined error model |
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