Abstract
CNES designed the DORIS system, based on Doppler measurements from a satellite receiver of a worldwide network of ground beacons. This system will be used to determine the precise orbit (with an accuracy of <10 cm) of the altimetric satellite TOPEX-POSEIDON, and also to compute precise coordinates (subdecimetric accuracy) of additional unknown beacons. The beacon network has been deployed, and a receiver is operating on-board SPOT 2, launched on 22 January 1990, to evaluate the instrument characteristics and improve processing techniques and models. The main system characteristics are described, and the results are presented: instrument performances, data quality and availability. Then the first processing results are described: orbit determination, earth gravity field model, positioning, ionosphere modelling. These results are preliminary, since many iterations will occur in late 1990, for a continuous improvement of the precision.
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