The doris network status report on renovation and collocations
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THE DORIS NETWORK: STATUS REPORT ON RENOVATION AND COLLOCATIONS PowerPoint PPT Presentation


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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

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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

  • 56 stations, 33 countries

  • Circles: SPOT-n & Envisat, 12°


Distribution of the doris equipment

Distribution of the DORIS equipment

Version 1.0 or 1.1 beacon

Version 2 beacon

Version 3 beacon

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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

SPOT-5

ENVISAT

JASON

SPOT-3

SPOT-4

TOPEX

SPOT-2


Network latest news

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


Network renovation progress

Network renovation progress


Antennas estimated stability 2002 01 01

Antennas estimated stability (2002/01/01)


Collocations with other iers techniques theoretical vs actual

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


Theoretical actual number of collocations

Theoretical/actual number of collocations


Theoretical collocations with other iers techniques

Theoreticalcollocations with other IERS techniques


Actual collocations with other iers techniques

Actualcollocations with other IERS techniques


Doris doris collocations 1

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)


Doris doris collocations 2

DORIS-DORIS collocations (2)


Tide gauges collocations 10 km

Tide gauges collocations (<10 km)


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