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Monthly spherical harmonic gravity field solutions determined from GRACE inter-satellite range-rate data alone
Space Geodesy Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Space Geodesy Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Space Geodesy Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Science Division, SGT Inc., Greenbelt, Maryland, USA
Science Division, SGT Inc., Greenbelt, Maryland, USA
Science Division, SGT Inc., Greenbelt, Maryland, USA
New monthly estimates of the Earth's gravity field determined solely from GRACE inter-satellite range-rate measurements using an improved method of accelerometer calibration and the use of a baseline state parameterization are presented in this paper. Our methodology exploits the inherent power of the inter-satellite range-rate data at the expense of the GPS data, which are used solely for establishing an accurate orbital reference and for calibrating accelerometers. Resulting gravity solutions show significantly less error than previously published GRACE solutions, especially for spherical harmonic terms of degree 2 and terms of order 15,16.
Received 4 October 2005; accepted 7 December 2005; published 25 January 2006.
Citation: (2006), Monthly spherical harmonic gravity field solutions determined from GRACE inter-satellite range-rate data alone, Geophys. Res. Lett., 33, L02402, doi:10.1029/2005GL024846.
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