Abstract
The COSPAR Panel on Satellite Dynamics is concerned with the orbital and attitude motion of artificial satellites and space probes and with techniques for the determination of these motions. Topics in satellite dynamics in which progress has been made in the current year include the further exploitation of the earth observation spacecraft ERS-1, ERS-2 and TOPEX/Poseidon, with their payloads including advanced tracking systems and altimeters; continuing development of the International GPS Service for Geodynamics (IGS); advances in gravity fiel modelling and intensified efforts in the analysis of potential future missions for gravity field improvement; refined modelling of non-gravitational forces and preparation of space missions with sensors able to accurately measure such forces.
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