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Demonstrated study on influences of intersatellite range on accuracy of GRACE Earth's gravity field

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Authors:Zheng Wei; Xu Houze; Zhong Min; Yun Meijuan; Zhou Xuhua
Author Affiliations:Primary:
China Earthquake Administration, Institute of Geodesy and Geophysics, Wuhan, China
Other:
Kyoto University, Japan
Wuhan University of Science and Technology, China
Volume Title:Dadi Celiang yu Diqiu Dongli Xue Journal of Geodesy and Geodynamics
Source:Dadi Celiang yu Diqiu Dongli Xue = Journal of Geodesy and Geodynamics, 31(2), p.60-65,70. Publisher: Gai Kan Bianjibu, Wuhan, China. ISSN: 1671-5942
Publication Date:2011
Note:In Chinese with English summary
Summary:The GRACE Earth's gravitational field complete up to degree and order 120 is recovered using the improved energy conservation principle and on the basis of different intersatellite ranges. The simulative results are as follows: Firstly, based on the same accuracy indexes of GRACE key payloads, while recovering the long-wavelength Earth's gravitational field(L≥20), with the increase of intersatellite ranges(110-330km) little by little, cumulative geoid height errors will be improved gradually. At degree 20, the accuracy of cumulative geoid height is at the level of 0.052 cm based on 110 km intersatellite range, and accuracies are 1.156 times and 1.209 times improved as using 220 km and 330 km intersatellite ranges. Secondly, while recovering the middle-wavelength Earth's gravitational field(100≥L≥120), at degree 120, the accuracy of cumulative geoid height comes to 13.052cm based on 110km intersatellite range, and accuracies are 1.327 times and 1.970 times degraded as using 220km and 330km intersatellite ranges. Lastly, intersatellite range designed as 220±50km can effectively suppress the decrease of the accuracies of long-wavelength and middle-wavelength Earth's gravitational field induced by improper range.
Subjects:Data processing; Earth; Geodesy; Geodetic networks; Geoid; GRACE; Gravity field; Inverse problem; Satellite methods
Record ID:788494-14
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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