An integral approach to regional gravity field refinement using earth gravity models

2013 ◽  
Vol 68 ◽  
pp. 18-28 ◽  
Author(s):  
Mehdi Eshagh
Keyword(s):  
Gravity Field ◽  
Gravity Models ◽  
Integral Approach ◽  
Earth Gravity ◽  
Earth Gravity Models ◽  
Regional Gravity

Are higher degree even zonals really harmful for the LARES/LAGEOS frame-dragging experiment?

2012 ◽  
Vol 90 (9) ◽  
pp. 883-888 ◽  
Author(s):  
G. Renzetti
Keyword(s):  
Gravity Field ◽  
Spherical Harmonics ◽  
Sufficient Accuracy ◽  
Gravity Models ◽  
Frame Dragging ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
The Earth ◽  
Earth Gravity Models ◽  
Low Altitude

The low-altitude effects of LARES are examined to determined how they can impact the outcome of the hoped 1% frame-dragging measurement in the LARES–LAGEOS experiment. This analysis, based on a different approach than other studies recently appearing in the literature, shows that the spherical harmonics of the Earth gravity field with degree ℓ > 60 may represent a threat because their errors map significantly into LARES orbital disturbances compared to frame-dragging. The GIF48 model was used. It is questionable whether future Earth gravity models by GRACE and GOCE will be of sufficient accuracy.

scholarly journals High-frequency analysis of Earth gravity field models based on terrestrial gravity and GPS/levelling data: a case study in Greece

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
T. D. Papanikolaou ◽  
N. Papadopoulos
Keyword(s):  
Gravity Field ◽  
Spherical Harmonic ◽  
Gravity Models ◽  
Earth Gravity Field ◽  
Earth Gravity ◽  
Gravity Field Recovery ◽  
High Degree ◽  
Spherical Harmonic Synthesis ◽  
Gravity Field Models ◽  
Terrestrial Data

AbstractThe present study aims at the validation of global gravity field models through numerical investigation in gravity field functionals based on spherical harmonic synthesis of the geopotential models and the analysis of terrestrial data. We examine gravity models produced according to the latest approaches for gravity field recovery based on the principles of the Gravity field and steadystate Ocean Circulation Explorer (GOCE) and Gravity Recovery And Climate Experiment (GRACE) satellite missions. Furthermore, we evaluate the overall spectrum of the ultra-high degree combined gravity models EGM2008 and EIGEN-6C3stat. The terrestrial data consist of gravity and collocated GPS/levelling data in the overall Hellenic region. The software presented here implements the algorithm of spherical harmonic synthesis in a degree-wise cumulative sense. This approach may quantify the bandlimited performance of the individual models by monitoring the degree-wise computed functionals against the terrestrial data. The degree-wise analysis performed yields insight in the short-wavelengths of the Earth gravity field as these are expressed by the high degree harmonics.

Accuracy assessments of recent earth gravity models using crossover altimetry

1996 ◽  
Vol 40 (1) ◽  
pp. 77-110 ◽  
Author(s):  
Jaroslav Klokočník ◽  
Carl A. Wagner ◽  
Jan Kostelecký
Keyword(s):  
Gravity Models ◽  
Earth Gravity ◽  
Earth Gravity Models ◽  
Accuracy Assessments
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