1. VSOP-2 project Update Hisashi Hirabayashi /JAXA VSOP-2 Project status
Tracking Station mtg,,　Feb. 19 & 20, 2006, OAM Madrid
VSOP-2　project　Update
　　　 Hisashi Hirabayashi /JAXA
VSOP-2
　　　Project status
　　　Spacecraft
and instruments
Act 2

2. VSOP-2 Project
Budget request was approved Dec. 2006
Internal Reviews;
ISAS System Definition Review March 19, or 26.
JAXA Project Review March, or April
Project formal start April 1, 2007 (FY2007 start day)
Project Manager Prof. Saito
Project Scientist Prof. Tsuboi (transfer from Nobeyama R. O. Director
after Hirax’s retirement )
Meetings;
VSOP Lessons Learned mtg in Hakone April org.ed by YH/HH/LIG
VSOP-2 symposium in Sagamihara Dec. 2007
Satellite
ETS-VIII (now Kiku-VIII) launched
and 2 LDRs were successfully deployed (Dec, 25-26, 2006).
Launch in Jan.-Feb is current plan, but ?
Still Uncertainty in Launcher
VLBI-Link
40GHz up and 37GHz down link, we propose.

3. 30,000 km HALCA and VSOP (1997 - 2006) 1.6 GHz (18 cm) 5 GHz (6 cm)
VLBI Space Observatory Programme
HALCA and VSOP ( )
Highly Advanced Laboratory for Communications and Astronomy
1.6 GHz (18 cm)
5 GHz (6 cm)
Resolution of
360 μarcseconds
　 at λ= 6 cm
30,000 km
Launch:
ISAS M-V rocket
Feb. 12, 1997
10 years anniversary,
a week ago !
Time flies as rockets do.

4. HALCA/VSOP project started in April 1989 HALCA Launch in Feb. 1997
HALCA last command
　　November 30, 2006
(３２１３　days after launch）
HALCA/VSOP was a 17 years project,
and terminated in March 2006.
Lessons Learned mtg in Hakone,
April l6, 17, 2007

5. ISAS Astronomy satellites Series
Astro-E launch failure ?
Astro-E II = Suzaku X-ray 2005
Astro-F = Akari IR
Solar-B = Hinode Sun last usage of M-V rocket
here is a long gap.
Astro-G = ??? Radio 2012
NeXT X-ray

6. VSOP-2 spacecraft In-Orbit Configuration 7 modules Feed/LNA
Mass (wet) 910Kg
Power 1,800 W
In-Orbit Configuration
7 modules
Sub-reflector
with 3-dim adjust.
Solar Paddle
Solar Paddle
Feed/LNA
9m offset Cassegrain Antenna
with Modular Structure
Link Antenna
Launch
Configuration
in M-V rocket
Main-Reflector
with 2-dim adjust

7. Modular antenna structure for VSOP-2
deployment mechanism and
back-structure same as ETS-VIII
but with new antenna surface design
(Study since 2000 with budgets)
ETS-VIII(Kiku-VIII)
was Launched in Dec ,
and was successfully
Deployed as below.
½ scale 7 modules successful
deployment test in 2006 Oct.
by Ariane piggyback
We use …
NASDA HPでcheck!

8. VLBI Link system Proposed frequency Astro-G High Gain Antenna
Diameter: 80cm
Astro-G
Proposed frequency
VLBI Data Downlink
Frequency GHz
Bit Rate Gbps
Modulation QPSK
TX-Power W
Phase Transfer Uplink
Frequency 40 GHz
No Modulation
TX-Power W
Ground Link Station
Diameter >10m
Data Storage
Data Storage
Capacity TB / 8 hours
H Maser
Phase Comparison

9. Phase-referencing observation Study
Rapid switching between target and phase reference sources
Increase sensitivity
Astrometric studies
Requirements
3 degeree separation
within 1 min cycle
High torque actuator :
CMG (Control Moment Gyro)
　 with 4 Reaction Wheels
Orbit determination accuracy: < 5cm
with GPS + SLR
Problems;
Expensive CMGs
OD accuracy cannot be enough
Consideration or Decision needed ??
For other option, we think the capability of phase referencing.
Off course, observing two objects at same time is better. And frequency switching is also available for improvement of sensitivity.
But rapid switching or tilting is the most realistic method, for the present.
So the requirements for phase referencing are these.
High torque actuator for rapid maneuver.
Because the phase error is orbit error times separation angle, now we assume maximum separation 3 degree.
Control Momentum Gyro(Honeywell)

10. Solar-B, Solar X-ray/Opt/UV Observatory,
was renamed HINODE which means “sunrise”.
It was launched near the sunrise into sun-synchronous orbit.
ＨＩＮＯＤＥ　ｌａｕｎｃｈ
by M-V-7
(the last M-V launch)
Ｓｅｐｔｅｍｂｅｒ　２３，　２００６
US/European contribution
to HINODE
On-board Instruments
(US,UK)
Tracking support
(ESA)
Uncertainties for Astro-G launcher
H-IIA
other ?
Orbit ? in case of shared launch

11. VSOP-2 Mission, Concluding Remarks
Astro-G Tracking Meeting, Feb, 2007, OAM Madrid
VSOP-2 Mission, Concluding Remarks
2nd Generation space-VLBI mission VSOP-2
is now funded for Astro-G satellite launch in Feb. 2012,
And the project will formally start in April 2007.
(Phase-A to Phase-B)
Design study and mission planning are in progress,
Group is being established in Japan.
VSOP-2 Orbit

12. US/Japan meeting, Socorro, Feb. EVN Directors mtg, Firenze, May
2006
US/Japan meeting, Socorro, Feb.
EVN Directors mtg, Firenze, May
Europe/Japan mtg, JIVE, June
　COSPAR GA, Beijin, July
IAU GA, Prague, Aug.
　 EVN symp. Torun, Sept.
　Tracking meeting, Pasadena, Oct. Nov.
EVN Directors mtg,Bonn, Nov.
2007
Lessons Learned mtg, April 18, 19, Japan (?)
Europe/US/Japan mtg, May, Bonn
VSOP-2 symposium Dec ISAS
VSOP-2 Selected
Contractor Selection (Now)
Budget Announciation
(Dec. 2006)
ISAS Mission Def. Review
JAXA Review
VSOP-2 Project start
(April 2007)

13. 5 Stations Tracking Network for HALCA
VSOP-2 tracking station(s)
in the European longitude
Yebes
South Africa ?
10m
64m
13m
40m
43 GHz
Space- Ground baseline
at Yebes
HALCA-Usuda first fringes
(via 10m) (64m) at 1.6 GHz
This slide was shown
to Dr. Southwood and ESA members
more than once.

14. VLBI Two-Way Link Need to make basic design soon
so that each partner can understand
and explain to funding agencies.
Need to establish an international
Study team by interested (or approved)
parties.
VSOP had 5 stations network
with 3 different design;
Usuda (ISAS) 1
DSN (JPL)
GB(NRAO)
with compatibility test
One group to design one scheme is
important.
OFDM (8CH, QPSK)
１ＣＨ、QPSK, 16QAM,…
Analog

15. Common design and delivery (draft thought)
Make common basic design Review at April mtg at Sagamihara
Common frequencies with NTS engineers’ presence
with RFI consideration with some more details
RF part　feed (antenna dependent)
polarizer / diplexer
IF and LO frequency chain
and O/E, E/O (station dependent)
Demodulator/ Modulator
module exist ? (JPL?)
Japanese FPGA-based design ?
Doppler compensation (unified open loop !)
Time/ phase correction measurement circuitry to be confirmed
Control and Logging Computer and Software
which cmputer ? language?
later Station Prarticipation
Who can work, or deliver in what part how many spare parts ?