Divergence-free spherical harmonic gravity field modelling based on the Runge–Krarup theorem: a case study for the Moon

2018 ◽  
Vol 93 (4) ◽  
pp. 489-513 ◽  
Author(s):  
Blažej Bucha ◽  
Christian Hirt ◽  
Michael Kuhn
Keyword(s):  
Gravity Field ◽  
Spherical Harmonic ◽  
The Moon ◽  
Gravity Field Modelling ◽  
Field Modelling ◽  
Divergence Free

scholarly journals Earth’s gravity field modelling based on satellite accelerations derived from onboard GPS phase measurements

2017 ◽  
Vol 91 (9) ◽  
pp. 1049-1068 ◽  
Author(s):  
X. Guo ◽  
P. Ditmar ◽  
Q. Zhao ◽  
R. Klees ◽  
H. H. Farahani
Keyword(s):  
Gravity Field ◽  
Earth’S Gravity Field ◽  
Phase Measurements ◽  
Gravity Field Modelling ◽  
Field Modelling ◽  
Satellite Accelerations

Harmonic Correction for Residual Terrain Modelling (RTM) Technique in Physical Geodesy Applications

2021 ◽  
Author(s):  
Meng Yang ◽  
Xiao-Le Deng ◽  
Min Zhong
Keyword(s):  
Gravity Anomaly ◽  
Gravity Field ◽  
Physical Geodesy ◽  
Geoid Height ◽  
Gravity Field Modelling ◽  
Field Modelling ◽  
Condensation Method ◽  
Residual Terrain Modelling ◽  
Harmonic Correction ◽  
Terrain Modelling

<p>       In physical geodesy, the harmonic correction (HC), as one of the main problems when using residual terrain modelling (RTM), has become a research focus of high-frequency gravity field modelling. Over past decades, though various methods have been proposed to handle the HC issues for RTM technique, most of them focused on the HC for RTM gravity anomaly rather than other gravity functionals, such as RTM geoid height and gravity gradient. In practice, the HC for RTM geoid height was generally assumed to be negligible, but a quantification is yet studied. In this study, besides the highlighted HC for gravity anomaly in previous studies, the expressions of HC terms for RTM geoid height are provided in the framework of the classical condensation method under infinite Bouguer plate approximation. The errors involved by various assumption of the classical condensation method, e.g., mass inconsistency between infinite masses in the HC and limited masses in the RTM, and planar assumption of the Earth’s surface, are further studied. Based on the derived formulas, the quantification of HC for RTM geoid height when reference surface is expanded to degree and order of 2,159 is given. Our results showed the significance of HC for RTM geoid height, with values up to ~10 cm, in cm-level and mm-level geoid determination. With integration masses extending up to a sufficient distance, such as 1° from calculation point for the determination of RTM geoid height, the errors due to an infinite Bouguer plate approximation are neglectable small. The validation through comparison with terrestrial measurements proved that the HC terms provided in this study can improve the accuracy of RTM derived geoid height and are expected to be useful for applications of RTM technique in regional and global gravity field modelling.</p>

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