EVGA Looking back at the early beginnings
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1 20 th Meeting of the European VLBI Group for Geodesy and Astrometry (EVGA), Bonn, Germany Wednesday, 28 th March 2011 EVGA Looking back at the early beginnings James Campbell, University of Bonn
2 3 rd 4 th Nov June 1985
3 1 st Meeting
4 2 nd Meeting
5 EVGA- Precursors 1976, Oct. 22: Onsala, Sweden: Third European VLBI Meeting (European Radio Astronomy Observatories) 1977, March 9: Bonn, Germany: AGRAM (Astrometrische und geodätisch-geophysikalische Nutzung radioastronomischer Methoden) Meeting on the astrometric and geodeticgeophysical use of radioastronomic techniques 1978, Nov. 28: Bonn, Germany: Second AGRAM Meeting (including participants from neighboring European countries) The AGRAM meetings were organised by P. Brosche, Astronomical Institute and J. Campbell, Geodetic Institute of the Bonn University
6 Aspects of European VLBI for Astrometry and Geodynamics - Create a permanent network of fixed stations: observations on a regular basis for - astrometry (extragalactic inertial system) - Earth rotation (Polar motion & UT1-variations) - Earth tides - Crustal motions (plate stability) - Reference for mobile stations - Look at available geodetic VLBI instrumentation at the European VLBI observatories - Dual band receivers (S/X) Compatibility with astro observations? - MkIII wide band backends and recording High cost, funding? - H - maser frequency standards High cost, funding? - Alternatives: MkII BWS? - Water vapour radiometry (2nd AGRAM, Nov. 1978)
7 European astrogeodetic VLBI Net (1980) operational planned Plans for MkIII Correlator at MPIfR Bonn (3 stations completed end of 1982)
8 Early VLBI experiments in Europe with astro-geodetic background Date Proposed and set up by Network and Experiment "Name" Remarks European baselines/networks Nov Haystack-MIT, Onsala, MPIfR Effelsberg-Onsala-Haystack-Greenbank-Owens Valley First full MkIII S/X Continental Drift (+ Bonn geodetic VLBI group) experiment Feb Bonn astro-geodetic VLBI group Effelsberg-Onsala-Green Bank-Johannesburg MkII 18 cm astro-geodetic pilot "JOEN" experiment July 1980 Haystack-MIT, Onsala, MPIfR Effelsberg-Onsala-Haystack-Fort Davis-Owens Valley Second MkIII S/X Continental Drift (+ Bonn geodetic VLBI group) experiment 26 July 1980 Bonn geodetic VLBI group Effelsberg - Onsala - Madrid MkII-X-band BWS "MEO 1" experiment Sept Haystack-MIT, Onsala, MPIfR Effelsberg-Onsala-Haystack-Fort Davis-Owens Valley First intercontinental MkIII S/X (+ Bonn geodetic VLBI group) "MERIT 1" Earth Rotation experiment Sept Bonn geodetic VLBI group Effelsberg - Onsala - Madrid MkII-X-band BWS "MEO 2" experiment 4 Oct Bonn geodetic VLBI group, Werthhoven - Haystack MkIII- X-band fast slewing experiment Haystack-MIT, NASA GSFC (test of Werthhoven facility FGAN) 5-6 Oct Bonn geodetic VLBI group Effelsberg-Westerbork-Jodrell Bank-Metsähovi MkII-6 cm BWS experiment "WEJO 1" (Project ERIDOC) Apr Bonn geodetic VLBI group Effelsberg-Onsala-Westerbork-Jodrell Bank-Chilbolton MkII-6 cm BWS experiment (+Geodetic Institute Delft) "WEJO 2" (Project ERIDOC) 20 July 1983 Bonn geodetic VLBI group, First baseline Wettzell-Onsala MkIII- X-band experiment Haystack-MIT, NASA GSFC Local baselines/networks 15 Nov. 1979/81/82 NASA/JPL + INTA + IGM Madrid DSN Complex, DSS-61, DSS-62, DSS-63 MkII S/X and S BWS experiments 13 Jan Onsala VLBI team 600m baseline between OSO 26.5m and OSO 20m Mk III X-band
9 Major Projects in Geodesy/Geodynamics Global: MERIT (IAU/IAG) G.A. Wilkins (RGO) et al. POLARIS (NGS) CDP (NASA/GSFC) TEMPO (NASA/JPL) W.E.Carter et al. W. Coates, T.A. Clark et al. J. Fanselow et al. Regional (Europe): ERIDOC (Delft, Bonn) EUROPE (Bonn) F.J.J. Brouwer, J. Campbell et al. J. Campbell et al
10 ERIDOC (Delft, Bonn) Oct. 1980, April cm MkII 40 MHz BWS 6 VLBI sites, 18 Doppler stations Processing at Caltech correlator Geodetic analysis at Bonn and Delft Decimeter accuracy in comparison Doppler/VLBI F.J.J. Brouwer, J. Campbell et al.
11 G.D. Nicolson A. Nothnagel The South-African connection JOEN Feb 1980 HARTRAO Johannesburg
12 Local networks at telscope sites Effelsberg: J. Campbell et al Madrid/Robledo: E. Calero, A. Rius 1980 Onsala: G. Lundquist 1981
13 1985 Further evolution of the European astrogeodetic VLBI Net 1991
14 Wettzell: Concept of a fundamental station, i.e. combining different geodetic space techniques on one site E.Flinn (NASA), H. Seeger (BKG), M. Schneider (TUM) Wettzell RT 1983
15 Strong support by MPIfR for Geodetic VLBI (Correlator Agreement for joint use and investment) R. Wielebinski, W. Alef, A. Witzel Standard geodetic VLBI equipment defined: S/X receivers MkIII Data Acquisition Terminals H-Maser frequency standards O. Lochner (MPIfR), G. Reichert (GIUB), R. Kilger, R. Zeitlhöfler (TUM/BKG) at Wettzell, 06/1983 MkIII DAT
16 European site velocity vectors (Wettzell fixed) TMR European Commission publication on crustal motion (2002)
17 Participants in the 1985 Onsala meeting Participants list in Proceedings of 4th EVGA 1985
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