the doris network status report on renovation and collocations
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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
  • 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
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
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)
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