Effect of different inter-satellite range on measurement precision of Earth’s gravitational field from GRACE

Zheng Wei; Hsu Houtse; Zhong Min; Yun Meijuan; Zhou Xuhua

doi:10.3724/SP.J.1246.2012.00044

Geodesy and Geodynamics (Feb 2012)

Effect of different inter-satellite range on measurement precision of Earth’s gravitational field from GRACE

Zheng Wei,
Hsu Houtse,
Zhong Min,
Yun Meijuan,
Zhou Xuhua

Affiliations

Zheng Wei: State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
Hsu Houtse: State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
Zhong Min: State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
Yun Meijuan: Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China
Zhou Xuhua: Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China

DOI: https://doi.org/10.3724/SP.J.1246.2012.00044
Journal volume & issue: Vol. 3, no. 1
pp. 44 – 51

Abstract

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The precision of Earth’s gravitational field from GRACE up to degree and order 120 was studied for different inter-satellite ranges using the improved energy conservation principle. Our simulated result shows that; For long wavelength (L ⩽ 20) at degree 20, the cumulative geoid-height error gradually decreased with increasing range, from 0. 052 cm for 110 km to 1. 156 times and 1. 209 times as large for 220 km and 330 km, respectively. For medium-wavelength (100 ⩽ L ⩽ 120) at degree 120, the cumulative geoid-height error decreased from 13. 052 cm for 110 km, to 1. 327 times and 1. 970 times as large for the ranges of 220 km and 330 km, respectively; By adopting an optimal range of 220±50 km, we can suppress considerably the loos of precision in the measurement of the Earth’s long-wavelength and medium-wavelength gravitational field.

Published in Geodesy and Geodynamics

ISSN: 1674-9847 (Print)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Science: Astronomy: Geodesy; Science: Physics: Geophysics. Cosmic physics
Website: https://www.keaipublishing.com/en/journals/geodesy-and-geodynamics/

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