Naslov
Determination of the Gravity Field from the CHAMP Measurements Considering the Energy Integral

Autori
Földvary, L. ; Gerlach, Ch. ; Švehla, Dražen ; Frommknecht, B. ; Gruber, Th. ; Peters, Th. ; Rothacher, M. ; Rummel, R. ; Sneeuw, N. ; Steigenberger, P. ; Wermuth, M.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Skup
XXIII IUGG General Assembly

Mjesto i datum
Sapporo, Japan, 30.06.2003. - 11.07.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
gravity field detemination; satellite missions; CHAMP; GRACE; GOCE

Sažetak
Gravity field determination with unprecedented resolution and accuracy is the expected outcome of the dedicated gravity satellite missions, CHAMP, GRACE and GOCE. The first of them, CHAMP, has been launched in July 2000. It is a Low-Earth Orbiter (LEO), continuously tracked by GPS satellites (High-Low Satellite-to-Satellite Tracking). Meanwhile a long set of GPS High-Low SST and accelerometer measurements is available, allowing the determination of a gravity model up to degree and order 80. In this study we have computed a CHAMP-only gravity field model using several months of measurements. For being independent of any a priori gravity information, we employ a purely kinematic CHAMP orbit. The basis of our method is the energy integral, computed from state vectors at 30 seconds sampling. In this talk we are going to present the derived CHAMP gravity field, focusing on all the related characteristics, such as (1) derivation of accurate velocities from precise kinematic orbit, and (2) the use of the accelerometer measurements, etc. Also the validation of the resulting gravity field model is discussed.

Izvorni jezik
Engleski

Znanstvena područja
Geodezija

POVEZANOST RADA