New Static Gravity Field Model SWJTU-GOGR01S Derived from GOCE Data and GRACE Normal Equation

SU Yong; FAN Dongming; PU Xinggang; YOU Wei; XIAO Dongsheng; YU Bing

doi:10.13203/j.whugis20150100

Volume 43 Issue 3

Mar. 2018

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Geomatics and Information Science of Wuhan University > 2018 > 43(3): 457-463. > DOI: 10.13203/j.whugis20150100

SU Yong, FAN Dongming, PU Xinggang, YOU Wei, XIAO Dongsheng, YU Bing. New Static Gravity Field Model SWJTU-GOGR01S Derived from GOCE Data and GRACE Normal Equation[J]. Geomatics and Information Science of Wuhan University, 2018, 43(3): 457-463. DOI: 10.13203/j.whugis20150100

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New Static Gravity Field Model SWJTU-GOGR01S Derived from GOCE Data and GRACE Normal Equation

1.
School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China
2.
Faculty of Geoscience and Environment Engineering, Southwest Jiaotong University, Chengdu 611756, China
3.
Chengdu Institute of Survey and Investigation, Chengdu 610081, China

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The National Natural Science Foundation of China 41574018

The National Natural Science Foundation of China 41404018

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Author Bio:
SU Yong, PhD, lecturer, specializes in determination of static and time-variation Earth's gravitational field model from satellite gravity measurement and global mass distribution monitoring. E-mail: suyongme@foxmail.com
Received Date: May 25, 2016
Published Date: March 04, 2018

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Abstract

Abstract

Global static gravitational field determined by GOCE and GRACE satellite data has become a hotspot in current research of geodesy. In this paper, a satellite-only global static gravity field model entitled SWJTU-GOGR01S up to degree and order 210 is recovered based on 3 years of GOCE gravity gradient data and ITG-GRACE2010S model's normal equation from 7 years GPS and K-band rang rate data. Four high precision GOCE gradiometer components (V_xx, V_yy, V_zz, V_xz) are filtered by the zero phase finite impulse band-pass digital filter, and then gradient observation equation is founded directly in gradiometer coordinates which avoids the loss of gradiometer component in accuracy in the conversion process. The optimal weight of the combination result of GOCE and GRACE data is determined by variance component estimation and the GOCE data polar gaps is dealt with the Kaula regularization method. Comparing the internal and external precision of SWJTU-GOGR01S with EIGEN-6C2 and GPS leveling data of North America, the results show that the geoid error and cumulative error of the SWJTU-GOGR01S model with degree and order 210 are 1.3 cm and 5.7 cm respectively. Compared with the fourth generation direct approach and time-wise approach models released by ESA, GOCO02S and GOCO03S model, the accuracy of the model SWJTU-GOGR01S is verified basically consistent with the model TIM-R4. The precision of SWJTU-GOGR01S model is also better than GOCO02S and GOCO03S model.
- GOCE,
- GRACE,
- gravity field model,
- variance component estimation,
- regularization

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References (28)

References

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