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A model of the time-variable gravity field inverted from combined GRACE on-board GPS and KBR range rate data
Guo NanNan1; Zhou XuHua1; Wu Bin1; Zhao Gang1
2017
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume60Issue:7Pages:2568
AbstractRecovering the GRACE time-variable gravity field in high precision remains a challenging task of satellite gravity. To solve this problem, we use Gravity Recovery and Climate Experiment (GRACE) on-board GPS observations and K-band range-rate (KBRR) measurements to achieve the orbit of GRACE satellite and monthly temporal gravity field solutions to degree/order 60 at the same time. The results are discussed in the aspects of orbit determination accuracy, GRACE on-board GPS data phase residuals, K-band range-rate measurements residuals and the precision of temporal gravity field solutions. The results show that: (1) compared with reduced dynamic orbit provided by NASA's Jet Propulsion Laboratory (JPL), three-dimensional position accuracy of our GRACE orbit solution is better than 5 cm. (2) The residuals of on-board GPS phase observations are about 5 similar to 8 mm, and the residuals of KBRR are about 0. 18 similar to 0. 30 mu m . s(-1) (3) Comparing the time-varying signal of our GRACE monthly solution with the RL05 models of Centre for Space Research (CSR) and JPL as well as the GeoForschungsZentrum (GFZ) RL05 model, our solutions agree with all of them in terms of the spatial distribution. Mass change signals in the Amazon basin and the Yangtze basin calculated by our model are compared with that of other models. The average correlation coefficients between ShangHai Astronomical observatory (SHA) and the aforementioned three time-variable gravity field models are all greater than 0. 9. It is evident that the algorithm presented in this paper has the ability to recover the GRACE time-variable gravity field model with a high precision which achieves the satellite orbits and the gravity field model at the same time. It can provide an important technical support for inversion of the Chinese satellite gravity field.
KeywordGRACE Time-variable gravity field K-band range-rate measurements On-board GPS observations Combined solution
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61619
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.中国科学院大学
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guo NanNan,Zhou XuHua,Wu Bin,et al. A model of the time-variable gravity field inverted from combined GRACE on-board GPS and KBR range rate data[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(7):2568.
APA Guo NanNan,Zhou XuHua,Wu Bin,&Zhao Gang.(2017).A model of the time-variable gravity field inverted from combined GRACE on-board GPS and KBR range rate data.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(7),2568.
MLA Guo NanNan,et al."A model of the time-variable gravity field inverted from combined GRACE on-board GPS and KBR range rate data".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.7(2017):2568.
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