vlbi network design australian government geoscience australia ngrs workshop, 1-2 february, canberra
DESCRIPTION
Geoscience Australia 02 February 2006TRANSCRIPT
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VLBI network design
Australian Government
Geoscience Australia
NGRS Workshop, 1-2 February, Canberra
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Geoscience
Australia02 February 2006
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Geoscience
Australia02 February 2006
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Radiotelescopes in Australia
Geoscience Australia
02 February 2006
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Radiotelescopes in Australia
Geoscience Australia
02 February 2006
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New network benefit
Geoscience Australia
02 February 2006
- ICRF (0.1 mas)
ITRF (1 mm)
network of small size fast moving dishes
IVS
Australian
more data
more sources
Australian geodetic datum
better reference sourcepositions
GPS
SLR
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New dish/network design benefit
Geoscience Australia
02 February 2006
Model sXp sYp sUT1 sNut1 sNut2 chi-sq Number (μas) (μas) (μsec) (μas) (μas) of scans____________________________________________________________________________ 6 stations 118 98 4.1 233 82 2.024 3290
6 st + Hartrao 101 61 4.2 168 60 1.646 3179
6 st + Hobart 81 69 3.4 156 61 1.657 3442
6 st + Yarra 58 59 2.7 133 47 1.693 3739
6 st + Y&Hob 58 54 2.7 133 45 1.646 4181
6 st + Y&Hart 43 47 2.5 116 43 1.553 3542
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Geoscience
Australia02 February 2006
Hobart,26-meterantenna
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
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New radiotelescope design
Geoscience Australia
02 February 2006
- 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
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Scheduling
Geoscience Australia
02 February 2006
- 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?
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Geoscience
Australia02 February 2006
Heght differencesNy-Alesund
Year
1994 1996 1998 2000 2002 2004 2006m
eter
-0.15
-0.10
-0.05
0.00
0.05
0.10
0.15
TRF daily difference time series
Height componentKokee
Year
1992 1994 1996 1998 2000 2002 2004 2006
met
er
-0.15
-0.10
-0.05
0.00
0.05
0.10
0.15
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Geoscience
Australia02 February 2006
TRF daily difference time series
Height component,Hobart
Year
1988 1992 1996 2000 2004
met
er
-0.15
-0.10
-0.05
0.00
0.05
0.10
0.15
Height componentHartrao
Year
1984 1988 1992 1996 2000 2004
met
er
-0.15
-0.10
-0.05
0.00
0.05
0.10
0.15