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Huygens the Planetary Probe

Huygens the Planetary Probe. under VLBI Magnifier. Leonid Gurvits Joint Institute for VLBI in Europe (JIVE) Dwingeloo, The Netherlands. 1629-1695. 1625-1712. 15.10.1997. Huygens entry, descent and landing: 14 Jan 2005. Radio astronomy segment of the Huygens mission.

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Huygens the Planetary Probe

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  1. Huygens the Planetary Probe under VLBI Magnifier Leonid Gurvits Joint Institute for VLBI in Europe (JIVE) Dwingeloo, The Netherlands

  2. 1629-1695 1625-1712 15.10.1997

  3. Huygens entry, descent and landing: 14 Jan 2005

  4. Radio astronomy segment of the Huygens mission • Conceived as an Earth-based support to the Doppler Wind Experiment (DWE) • Included • Direct carrier signal detection with DSN-supplied Radio Sci Receiver (real time capability) at Green Bank and Parkes telescopes; • Direct Doppler measurements (JPL-led experiment) at four NRAO VLBA antennas; • Very Long Baseline Interferometry (VLBI) tracking of the probe from 17 radio telescopes (including all six above); • Used (only!) the Channel A carrier signal at 2040 MHz only. L.Gurvits, EC Press Conference, Dwingeloo, NL

  5. D B Interferometry: a one-slide tutorial Michelson & Young, 1890s: measurements of stars’ diametres Very Long Baseline Interferometry (VLBI): the ultimate angular resolution in astrophysics L.Gurvits, EC Press Conference, Dwingeloo, NL

  6. VLBI tracking of Huygens, 14 January 2005 09:30 UTC 16:00 UTC • Huygens VLBI tracking obtained: • 340 min of carrier signal • 26 TByte of data (equivalent of ~6,000 DVD movies)

  7. Cassini S/C TCXO TCXO Channel B Huygens Data TCXO RUSO TCXO RUSO Channel A Huygens Receivers Huygens Probe “Channel C” – eavesdropping on Channel A carrier Huygens signal paths

  8. Parachute flight dynamics Huygens radial velocity measurements L.Gurvits, EC Press Conference, Dwingeloo, NL

  9. A priori accuracy: ~100 km “Doppler interferometry”: ~25 km Full VLBI accuracy: ~ 1 km VLBI determination of the Huygens descent trajectory

  10. VLBI tracking of the Huygens Probe • Pushing the limits of high technology • Demonstrates high-level synergy between radio astronomy and space exploration • Paves the way for future experiments and applications – GPS-like accuracy anywhere in Solar System (Moon, inner and outer planets) • Great promise of next generation radio telescopes and arrays (e.g. Square Kilometre Array, SKA)

  11. Huygens VLBI tracking team (abbreviated) JIVEESA-ESTECNASA-JPLNRAO I.M.Avruch C.. van’t Klooster S.Asmar W.Brisken H.Bignall J.-P.Lebreton W.Folkner F.Ghigo A.Brunthaler R.A.Preston G.Langston R.M.Campbell J.Romney M.A.Garrett L.I.Gurvits, R.Oerlemans S.V.Pogrebenko ASTRONATNFU TasmaniaNICT (CRL) A.R.Foley J.Lovell G.Cimo T.Kondo C.Phillips. S.Elingsen U Bonn J. Reynolds B.Reid M.Bird R.Sault. T.Tzioumis NAO ChinaHelsinki UISAS T.An (ShAO) A.Mujunen R.Dodson X.Hong (ShAO) J.Ritakari S.Huang (ShAO) D.Jiang (ShAO) X.Liu (UAO) 12 institutes and international organisations in 7 countries L.Gurvits, EC Press Conference, Dwingeloo, NL

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