VLBI network design Australian Government Geoscience Australia NGRS Workshop, 1-2 February, Canberra.

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Presentation transcript:

VLBI network design Australian Government Geoscience Australia NGRS Workshop, 1-2 February, Canberra

Geoscience Australia 02 February 2006

Geoscience Australia 02 February 2006

Radiotelescopes in Australia Geoscience Australia 02 February 2006

Radiotelescopes in Australia Geoscience Australia 02 February 2006

New network benefit Geoscience Australia 02 February

New dish/network design benefit Geoscience Australia 02 February 2006 Model sXp sYp sUT1 sNut1 sNut2 chi-sq Number ( μ as) ( μ as) ( μ sec) ( μ as) ( μ as) of scans ____________________________________________________________________________ 6 stations st + Hartrao st + Hobart st + Yarra st + Y&Hob st + Y&Hart

Geoscience Australia 02 February 2006 Hobart, 26-meter antenna Too far from all other radiotelescopes; Limited amount of good radiosources in the southern hemisphere; Slow slew rate (1 deg/sec) – little data; Old design

New radiotelescope design Geoscience Australia 02 February Small size (< 20 meter); - High slew rate (> 5 deg/sec); - Near real-time VLBI; - New equipment (broad band receiver 1-32 GHz); - 5 deg elevation angle limit

Scheduling Geoscience Australia 02 February sharing time between astronomical VLBI and geodetic VLBI - 50/50 - IVS makes schedule on annual basis - ATNF makes schedule on semiannual basis - at least one Australian site each calendar day - own time assignment committee?

Geoscience Australia 02 February 2006 TRF daily difference time series

Geoscience Australia 02 February 2006 TRF daily difference time series