Status of GCOM-W project

1
Status of GCOM-W project

• Earth Observation Research Center and GCOM
  Project Team
• Japan Aerospace Exploration Agency
• AMSR-E Joint Science Team Meeting
• Washington D.C., USA
• June 25, 2009

2
GCOM 1st Generation

• 2 medium-sized satellite GCOM-W and -C.
• 3 consecutive generations with 1 year overlaps
  for assuring long-term inter-calibrated data
  records.

GCOM-W1 (Water)
GCOM-C1 (Climate)
AMSR2
SGLI
Instrument Advanced Microwave Scanning Radiometer-2
Orbit Sun Synchronous orbit Altitude699.6km (on Equator) Inclination 98.186 degrees Local sun time 1330/-15 min
Size 5.1m (X) 17.5m (Y) 3.4m (Z) (on-orbit)
Mass 1910kg
Power gen. More than 4050W (EOL)
Launch January 2012 by H-IIA Rocket
Design Life 5-years
Instrument Second-generation Global Imager
Orbit Sun Synchronous orbit Altitude798km (on Equator) Inclination 98.6 deg. Local sun time 1030/- 15min
Size 4.6m (X) 16.3m (Y) 2.8m (Z) (on orbit)
Mass 2020kg
Power gen. More than 4250W (EOL)
Launch JFY2013 (TBD) by H-IIA Rocket
Design Life 5-years
3
Program Status
Japanese Fiscal Year FY2006 FY2007 FY2008 FY2009 FY2010 FY2011 FY2012 FY2013
Milestone
GCOM-W1
GCOM-C1
GCOM-W1 Project start
GCOM-C1 Launch (TBC)
GCOM-W1 Launch
GCOM-C1 Project start
PDR
SDR
CDR
Phase-B
Phase-C
Phase-D
Phase-A
PDR
CDR
SDR
Pre-Phase-A
Phase-B
Phase-C
Phase-A
Phase-D
() Japanese Fiscal Year starts in April and ends
in March.
Present
4
Program Status

• GCOM-W1
• AMSR2 CDR finished in January 2009.
• System engineering model tests were over.
• System CDR in summer-autumn 2009.
• Ongoing discussion between JAXA and NASA for
  GCOM-W1 to join A-Train.
• Currently in 2nd year of PI research period.
• GCOM-W2
• AMSR2 improvement study for GCOM-W2 recently
  started (e.g., addition of high-frequency
  channels).
• Feasibility study to accomodate US scatterometer
  is ongoing, as well as summarizing research and
  operational users requirements with NOAA and
  NASA.

GCOM-W1 STM
5
AMSR2 Instrument

• Deployable main reflector system with 2.0m
  diameter.
• Frequency channel set is identical to that of
  AMSR-E except 7.3GHz channel for RFI mitigation.
• Two-point external calibration with the improved
  HTS (hot-load).
• Deep space calibration maneuver to check
  consistency between main reflector and CSM.
• Add a redundant momentum wheel to increase
  reliability.

Deployed
Stowed
AMSR2 Channel Set AMSR2 Channel Set AMSR2 Channel Set AMSR2 Channel Set AMSR2 Channel Set
Center Freq. GHz Band width MHz Polarization Beam width deg (Ground res. km) Sampling interval km
6.925/ 7.3 350 V and H 1.8 (35 x 62) 10
10.65 100 V and H 1.2 (24 x 42) 10
18.7 200 V and H 0.65 (14 x 22) 10
23.8 400 V and H 0.75 (15 x 26) 10
36.5 1000 V and H 0.35 (7 x 12) 10
89.0 3000 V and H 0.15 (3 x 5) 5
GCOM-W1/AMSR2 characteristics GCOM-W1/AMSR2 characteristics
Scan and rate Conical scan at 40 rpm
Antenna Offset parabola with 2.0m dia.
Swath width 1450km
Incidence angle Nominal 55 degrees
Digitization 12bits
Dynamic range 2.7-340K
Polarization Vertical and horizontal
6
SGLI Instrument
GCOM-C SGLI characteristics GCOM-C SGLI characteristics
Scanning Type SGLI-VNR Push-broom electric scan (VN P) SGLI-IRS Wisk-broom mechanical scan (SW T)
Observation Channel SGLI-VNR (Visible Near infrared) Non-Polarized Observation 11 channel Polarized Observation 2 channel
Observation Channel SGLI-IRS Shortwave infrared 4 channel Thermal infrared 2 channel
Swath 1150km cross track (VN P) 1400km cross track (SW T)
Digitalization 12bit
Polarization 3 polarization angles for P
observing direction Along Track 45 deg and -45 deg for P Nadir for VN, SW and T
SGLI channels SGLI channels SGLI channels SGLI channels SGLI channels SGLI channels
CH ? ?? Lstd Lmax IFOV
CH nm nm VN, P W/m2/sr/?m T Kelvin VN, P W/m2/sr/?m T Kelvin m
VN1 380 10 60 210 250
VN2 412 10 75 250 250
VN3 443 10 64 400 250
VN4 490 10 53 120 250
VN5 530 20 41 350 250
VN6 565 20 33 90 250
VN7 670 10 23 62 250
VN8 670 20 25 210 250
VN9 763 8 40 350 1000
VN10 865 20 8 30 250
VN11 865 20 30 300 250
SW1 1050 20 57 248 1000
SW2 1380 20 8 103 1000
SW3 1640 200 3 50 250
SW4 2210 50 1.9 20 1000
T1 10800 700 300 340 500
T2 12000 700 300 340 500
P1 670 20 25 250 1000
P2 865 20 30 300 1000