Sideris, M. G.

Sneeuw, N.

Weigelt, Matthias

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Combination of CHAMP and GRACE  satellite data for Earth monitoring Introduction: • Concept of energy balance is applied for gravity field recovery. • The basic characteristic is the use of GPS derived position and velocity data and the correction for non-gravitational forces.  • Time-wise spherical harmonic analysis on a global scale. • CHAMP monthly solutions depend on groundtrack coverage • Combination with GRACE satellite data yields more consistent monthly solutions • Application in geodesy, geodynamics, geology, hydrology, glaciology, sea level, geophysical prospecting Method: • The energy integral approach is connecting position, velocity and accelerometry to the disturbing potential.           • Spherical harmonic analysis yields spherical harmonic coefficients on a monthly basis contact Matthias Weigelt, mlbweige@ucalgary.ca Geomatics Engineering, University of Calgary 2500 University Drive N.W., Calgary, AB, Canada Matthias Weigelt, Michael G. Sideris , Nico Sneeuw Partner:                         National Resources Canada                       Geodetic Survey Division, Canada                       Institute for Astronomical and Physical Geodesy,                       Technical University Munich                       Institute of Geodesy, University Stuttgart                       GeoForschungsZentrum Potsdam                       Institut für Erdmessung, University Hannover  Acknowledgement: • GEOIDE Network of Centers of Excellence, Canada • GEOIDE Phase II Project ACQ#SID • GEOIDE Phase III Project SLMA#36 • Werner Graupe International Fellowship in Engineering, Canada Combination with GRACE satellite data • GRACE system viewed as two singles satellite systems        Improvement in monthly solution: • More measurements and better groundtrack coverage yield more homogeneous and consistent monthly solutions • Combination needs sophisticated tools, e.g. variance-component estimation Contribution to Earth Monitoring: GEOIDE's 8th Annual Scientific Conference Banff, AB, May 31 to June 2, 2006  CHAMP-only solutions:  .            • Recovery of time variable signal from a time variable groundtrack pattern • Poor groundtrack coverage yields degradation of monthly solutions Snm - | - Cnm-60 -40 -20 0 20 40 60010203040506070Snm - | - Cnm-60 -40 -20 0 20 40 60010203040506070-10 -9.5 -9 -8.5 -8 -7.5 -7CHAMP error spectrumJanuary 2003 June 2003 

Combination of CHAMP and GRACE satellite data for Earth monitoring

http://orbilu.uni.lu/bitstream/10993/14402/1/Weigelt2006b.pdf

Combination of CHAMP and GRACE satellite data for Earth monitoring

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