DORIS network 2006 review: renovation result, stability and co-location assessment, prospects
(1) IGN, SAINT-MANDE CEDEX, France
Session theme: System
Since the start of its deployment almost 20 years ago, the DORIS network has been continuously improving. Even though it had met around 1993 its initial objective of roughly 50 stations, it has been continuing to get denser, and to have more and more co-locations with other space geodesy techniques and tide gauges.
As of 2000, a major renovation program, aiming at improving the long term stability of the antennas, was initiated and is now almost complete. During this six-year period, three-quarters of the 56 currently operating stations in the DORIS permanent network, have been either deeply renovated or newly installed.
After an initial, somewhat subjective, antenna stability estimation which was used to plan and monitor the network renovation progress, a more analytical approach to assess the antenna support long term stability is presented.
The network renovation also includes an upgrade of the transmitting beacons, using the third generation model which is now deployed at 42 stations.
Up-to-date statistics about equipment distribution, maintenance, and host agencies will be given.
We will then review the current network co-locations, either with space geodesy techniques, tide gauges, or internally between successive DORIS occupations.
Like the antenna stability, the quality of the currently active co-locations has been assessed.
We will conclude by presenting the evolution prospects, which aim at completing the equipment renovation, further improving the orbit coverage and network robustness, and improving the distribution of geodetic co-locations.
Mr Herve FAGARD
2 av. Pasteur
94165 SAINT-MANDE CEDEX
Phone: +33 1 43 98 81 48
Fax: +33 1 43 98 84 50
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