ASTROGVSOP2 Science Capability

1
ASTRO-G/VSOP-2Science Capability

• ASTRO-G Project (JAXA)

2
Key Technology Large Deployable Antenna
Module-type offset-Cassegrain antenna (use
ETS-VIII deployment mechanism)
Mesh Tension Truss
HALCA (1997)
Need higher accuracy module
Offset-cassegrain antenna
ETS-VIII (Dec. 2006)
3
Development of a high accuracy antenna module
4
Deployment of ETS-VIII antenna(Dec. 25-26, 2006)
5
ASTRO-G System Block Diagram
CMGs
6
(No Transcript)
7
(No Transcript)
8
Upgrade/Difference from HALCA

• Polarization capability
• ASTRO-G can see calibrators.
• Possible to observe in the eclipse when the
  eclipse is short.
• Possible to observe while in recharging.
• Orbit period is 7.5 hours with 25,000km apogee
  height (i.e 6.3 hours for HALCA)
• Nominal inclination is around 30 degree.
• (30 60 degree? )
• Sun angle constraint
• 50 310 degree (Sun direction 0 degree)
• 1 Gbps downlink
• 128 MHz x 2ch (2 bit) or 256 MHz x (2 ch 1 bit)
• Correlate 1 bit and 2 bit (256 MHz 2 ch
  2bit at GRTs)