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THE DORIS NETWORK: STATUS REPORT ON RENOVATION AND COLLOCATIONS

THE DORIS NETWORK: STATUS REPORT ON RENOVATION AND COLLOCATIONS. Hervé FAGARD (Institut Géographique National). The network on 2003/01/01. 56 stations, 33 countries. Circles: SPOT-n & Envisat, 12°. Distribution of the DORIS equipment. Version 1.0 or 1.1 beacon. Version 2 beacon.

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THE DORIS NETWORK: STATUS REPORT ON RENOVATION AND COLLOCATIONS

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  1. THE DORIS NETWORK: STATUS REPORT ON RENOVATION AND COLLOCATIONS Hervé FAGARD (Institut Géographique National)

  2. The network on 2003/01/01 • 56 stations, 33 countries • Circles: SPOT-n & Envisat, 12°

  3. Distribution of the DORIS equipment Version 1.0 or 1.1 beacon Version 2 beacon Version 3 beacon + + + + + + Alcatel antenna Alcatel antenna Alcatel antenna Starec antenna Starec antenna Starec antenna 9 stations 24 stations 1 station 12 stations 1 station 9 stations

  4. Evolution of the network SPOT-5 ENVISAT JASON SPOT-3 SPOT-4 TOPEX SPOT-2

  5. Network: latest news • Two new stations installed at the end of 2002: • Thule (Greenland) • Sal (Cape Verde), replacing Dakar • Theoretical orbit coverage (when all stations are operating): • “Low” satellites (SPOT-2 , 4, 5 & Envisat) : 88 % • “High” satellites (Topex & Jason): 98 % • Stations renovated in 2002: • Tristan da Cunha, Terre Adélie, Port Moresby, Kauai • Next planned renovations: • Manila (next week) • St Helena, Ascension (March) • Mount Stromlo destroyed by fire in January; should be rebuilt by mid-2003

  6. Network renovation progress

  7. Antennas estimated stability (2002/01/01)

  8. Collocations with other IERS techniques:theoretical vs. actual • Many collocated instruments are not currently operating: • Discontinued long-term occupation by: • VLBI (Richmond, Santiago) • SLR (e.g. Dionysos, Easter Island, Goldstone, etc.) • Short duration (2 days only once, to a few days per year) mobile VLBI occupation (Toulouse, Ponta Delgada, Metsähovi, Greenbelt) • Unreliable tie: • Insufficient accuracy, measured only once, sometimes many years ago • Very long baseline, different geological movements (e.g. Kourou) • Network future evolutions should aim at adding a few VLBI and SLR collocations

  9. Theoretical/actual number of collocations

  10. Theoreticalcollocations with other IERS techniques

  11. Actualcollocations with other IERS techniques

  12. DORIS-DORIS collocations (1) • 29 DORIS stations have multiple antenna positions: • Two different antenna positions at 21 sites • Three different antenna positions at 8 sites • All ties between different antenna positions on the same site have been measured accurately, except: • AMSA-AMSB (approximate connection planned, AMSA no longer exists) • HBKA-HBLA (antenna moved by host agency, no direct survey) • HELA-HELB (antenna change by host agency, no survey) • KERA-KERB (dubious KERA antenna height) • GOLA-GOMA (no direct connection)

  13. DORIS-DORIS collocations (2)

  14. Tide gauges collocations (<10 km)

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