Pregled bibliografske jedinice broj: 164987
A Gravity Field Model From Two Years of CHAMP Kinematic Orbits Using the Energy Balance Approach
A Gravity Field Model From Two Years of CHAMP Kinematic Orbits Using the Energy Balance Approach // Geophysical Research Abstracts, Vol. 6. ISSN:1029– ; 7006
Nica: European Geosciences Union (EGU), 2004. (predavanje, nije recenziran, sažetak, znanstveni)
CROSBI ID: 164987 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
A Gravity Field Model From Two Years of CHAMP Kinematic Orbits Using the Energy Balance Approach
Autori
Wermuth, M. ; Švehla, Dražen ; Földvary, L. ; Gerlach, Ch. ; Gruber, Th. ; Rummel, R. ; Rothacher, M. ; Frommknecht, B. ; Peters, Th. ; Steigenberger, P.
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Geophysical Research Abstracts, Vol. 6. ISSN:1029– ; 7006
/ - Nica : European Geosciences Union (EGU), 2004
Skup
1st General Assembly, European Geophysical Society
Mjesto i datum
Nica, Francuska, 25.04.2004. - 30.04.2004
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Nije recenziran
Ključne riječi
CHAMP gravity field model; two years data set; kinematic orbits; energy balance
Sažetak
An enhanced CHAMP gravity field model has been computed based solely on GPS orbit tracking and accelerometry, without any prior gravity information entering the computation. The basic characteristics of our approach are (1) the use of purely kinematic orbits, (2) the determination of satellite velocities from kinematic positions by numerical differentiation, (3) the transformation of velocities to gravity potential employing the principle of energy conservation and (4) the correction for non-conservative forces either derived from measured accelerations or from models. Our first solution based on this new technique computed from 6 months of CHAMP data in 2002 was published last year (TUM-1S model). In the meantime the processing could be improved significantly in all 4 steps and more high quality CHAMP observation data are available. For the gravity field model presented here 2 years of CHAMP kinematic orbits in 2002 and 2003 were used. Due to the decay of the satellite the sensitivity to higher frequencies of the gravity field is improved what makes it possible to solve now for higher degrees of the spherical harmonic series. The validation of the model with external information shows significant improvements in quality with respect to TUM-1S.
Izvorni jezik
Engleski
Znanstvena područja
Geodezija
