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Titolo:
Exploring gravity field determination from orbit perturbations of the European Gravity Mission GOCE
Autore:
Visser, PNAM; van den IJssel, J; Koop, R; Klees, R;
Indirizzi:
Delft Univ Technol, Delft Inst Earth Oriented Space Res, NL-2629 HS Delft,Netherlands Delft Univ Technol Delft Netherlands NL-2629 HS 629 HS Delft,Netherlands
Titolo Testata:
JOURNAL OF GEODESY
fascicolo: 2-3, volume: 75, anno: 2001,
pagine: 89 - 98
SICI:
0949-7714(200105)75:2-3<89:EGFDFO>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RECOVERY;
Keywords:
GOCE; GPS gravity field determination; linear perturbation theory; numerical integration; orbit perturbations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Visser, PNAM Delft Univ Technol, Delft Inst Earth Oriented Space Res, Kluyverweg 1, NL-2629 HS Delft, Netherlands Delft Univ Technol Kluyverweg 1 Delft Netherlands NL-2629 HS
Citazione:
P.N.A.M. Visser et al., "Exploring gravity field determination from orbit perturbations of the European Gravity Mission GOCE", J GEODESY, 75(2-3), 2001, pp. 89-98

Abstract

A comparison was made between two methods for gravity field recovery from orbit perturbations that can be derived from global positioning system satellite-to-satellite tracking observations of the future European gravity field mission GOCE (Gravity Field and Steady-State Ocean Circulation Explorer). The first method is based on the analytical linear orbit perturbation theory that leads under certain conditions to a block-diagonal normal matrix for the gravity unknowns, significantly reducing the required computation time. The second method makes use of numerical integration to derive the observation equations, leading to a full set of normal equations requiring powerful computer facilities. Simulations were carried out for gravity field recovery experiments up to spherical harmonic degree and order 80 from 10 days of observation. It was found that the first method leads to large approximation errors as soon as the maximum degree surpasses the first resonance orders and great care has to be taken with modeling resonance orbit perturbations, thereby loosing the block-diagonal structure. The second method proved to be successful, provided a proper division of the data period into orbital arcs that are not too long.

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Documento generato il 15/07/20 alle ore 20:00:01