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Australian Government Geoscience Australia. First geodetic results from the AuScope VLBI network Oleg Titov. UTAS, Hobart, 20 June 2012. 03/000. Geoscience Australia. 20 June 2012. Geoscience Australia. 20 June 2012. The concept. . . B. B = 10000 km ,  = 0.03 cos sec.

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  1. Australian Government Geoscience Australia First geodetic results from the AuScope VLBI network Oleg Titov UTAS, Hobart, 20 June 2012 03/000

  2. Geoscience Australia 20 June 2012

  3. Geoscience Australia 20 June 2012

  4. The concept   B B = 10000 km,  = 0.03cos sec Geoscience Australia 18 October 2010

  5. Correlation Time delay:  = T’ - T Disk 1 Output values: - Time delay and its error - Amplitude and phase - Cross-correlation - etc. Disk 2 Geoscience Australia 20 June 2012

  6. Local tie Geoscience Australia 20 June 2012

  7. Reference Frames :co-location • At sites where the technique are co-located (<300 metres apart) a millimetre level connection is measured using classical geodetic techniques • This provides the link between the measurement techniques • In Australia GA routinely undertakes these surveys at Tidbinbilla, Yarragadee, Hobart, Mount Stromlo DORIS GPS VLBI SLR

  8. ITRF2005 Velocity field Geoscience Australia 20 June 2012

  9. AuScope project densification

  10. Australian – New Zealand network Geoscience Australia 20 June 2012

  11. 12m Antenna at Patriot

  12. The “dish” at work

  13. 12m Antenna at Patriot 5 deg/sec in azimuth, 1.5 deg/sec in elevation

  14. AuScope network • Hobart12 – started operation in tag along mode in October 2010; in full mode – January, 2011 • Yarragadee – since 26 May, 2011 • Katherine – since 16 June, 2011; • Astrometric problems are likely to contribute to the total geodetic error budget 20 June 2012

  15. Hobart12 Mostly for IVS-R1, R4 sessions (EOP)AstrometryRegional geodesy In total we have 78 ‘good’ session From 50 to 635 observations per session Geoscience Australia 20 June 2012

  16. Hobart12 – X component Geoscience Australia 20 June 2012

  17. Hobart12 – Y component Geoscience Australia 20 June 2012

  18. Hobart12 – Z component Geoscience Australia 20 June 2012

  19. Hobart12 (ITRF2005) Reference epoch T = 2009.904 Geoscience Australia 20 June 2012

  20. Hobart12 (ITRF2005) Tectonic velocities Geoscience Australia 20 June 2012

  21. Hobart12 (ITRF2005) Error budget? Geoscience Australia 20 June 2012

  22. Kath12M In total we have 24 ‘good’ session From 104 to 700 observations per session Not properly tied to ITRF2005 Geoscience Australia 20 June 2012

  23. Kath12M – X component Geoscience Australia 20 June 2012

  24. Kath12M – Y component Geoscience Australia 20 June 2012

  25. Kath12M – Z component Geoscience Australia 20 June 2012

  26. Yarra12M In total we have 12 ‘good’ session From 28 to 452 observations per session Not properly tied to ITRF2005 Geoscience Australia 20 June 2012

  27. Yarra12M – X component Geoscience Australia 20 June 2012

  28. Yarra12M – Y component Geoscience Australia 20 June 2012

  29. Yarra12M – Z component Geoscience Australia 20 June 2012

  30. Baseline Hobart12 - Kath12M (ICRF2 reference radio sources) Geoscience Australia 20 June 2012

  31. Hobart12 - Katherine (distant reference radio sources, z>1.7) Geoscience Australia 20 June 2012

  32. Hobart12 - Katherine Baseline evolution Geoscience Australia 20 June 2012

  33. Internal vs external accuracy For X, Y, Z components – external accuracy looks more then internal Baseline lengths are sensitive to selection of reference radio sources Geoscience Australia 20 June 2012

  34. Internal vs external accuracy May be caused by uncertainty of the reference radio sources in the southern hemisphere Rotation of the whole Australian subnetwork due to astrometric instability of the reference sources, or just poor astrometric positions Geoscience Australia 20 June 2012

  35. ICRF1 catalogue (1998) 608 sources separated into 3 groups • 212 defining sources with the floor positional accuracy ~0.25 mas • 294 candidate sources • 102 other sources Geoscience Australia 20 June 2012

  36. ICRF2 catalogue (1998) 3414 sources separated into 3 groups • 295 defining sources with the positional accuracy ~0.04 mas • 922 “non-defining” sources • 1217 VCS sources Geoscience Australia 20 June 2012

  37. First catalogue (Ma et al., 1990)

  38. ICRF1 defining sources Geoscience Australia 20 June 2012

  39. ICRF2 sources

  40. ICRF2 defining sources (295) Geoscience Australia 20 June 2012

  41. ICRF2 non-defining sources (922) Geoscience Australia 20 June 2012

  42. 2145+067 20 June 2012

  43. ICRF source instability(quasar 2201+315) Geoscience Australia 20 June 2012

  44. ICRF source instability(quasar 2201+315, in plane, 2001-2004) other stable # 3 Shift ~1.2 mas ( ~3.5 cm ) Geoscience Australia 20 June 2012

  45. Systematic proper motion (555 sources) 20 June 2012

  46. Systematic proper motion (40 best sources) 20 June 2012

  47. Systematic proper motion(555 sources) 20 June 2012

  48. Systematic proper motion Dipole component – 6.4 +/- 1.5 μas/year Titov, Lambert, Gontier A&A 529, A91 (2011) Theory 46 μas/year Total displacement is up to ~130 μas for 22 years since 1990 20 June 2012

  49. Systematic proper motion Quadrupole component ?? 20 June 2012

  50. Conclusion • Geodesy • Astrometry 20 June 2012

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