This book on space geodesy presents pioneering geometrical approaches in the modelling of
satellite orbits and gravity field of the Earth based on the gravity field missions CHAMP
GRACE and GOCE in the LEO orbit. Geometrical approach is also extended to precise positioning
in space using multi-GNSS constellations and space geodesy techniques in the realization of the
terrestrial and celestial reference frame of the Earth. This book addresses major new
developments that were taking place in space geodesy in the last decade namely the
availability of GPS receivers onboard LEO satellites the multitude of the new GNSS satellite
navigation systems the huge improvement in the accuracy of satellite clocks and the revolution
in the determination of the Earth's gravity field with dedicated satellite missions.
