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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
THE DORIS NETWORK: STATUS REPORT ON RENOVATION AND COLLOCATIONS

Hervé FAGARD (Institut Géographique National)


The network on 2003 01 01
The network on 2003/01/01 COLLOCATIONS

  • 56 stations, 33 countries

  • Circles: SPOT-n & Envisat, 12°


Distribution of the doris equipment
Distribution of the DORIS equipment COLLOCATIONS

Version 1.0 or 1.1 beacon

Version 2 beacon

Version 3 beacon

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+

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Alcatel antenna

Alcatel antenna

Alcatel antenna

Starec antenna

Starec antenna

Starec antenna

9 stations

24 stations

1 station

12 stations

1 station

9 stations


Evolution of the network
Evolution of the network COLLOCATIONS

SPOT-5

ENVISAT

JASON

SPOT-3

SPOT-4

TOPEX

SPOT-2


Network latest news
Network: latest news COLLOCATIONS

  • 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




Collocations with other iers techniques theoretical vs actual
Collocations with other IERS techniques: COLLOCATIONStheoretical 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



Theoretical collocations with other iers techniques
Theoretical COLLOCATIONScollocations with other IERS techniques


Actual collocations with other iers techniques
Actual COLLOCATIONScollocations with other IERS techniques


Doris doris collocations 1
DORIS-DORIS collocations (1) COLLOCATIONS

  • 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)




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