Spacecraft Spacecraft

 

GOSAT-2 spacecraft is a medium-size satellite with two solar paddles. Its design is based on JAXA's ALOS-2 satellite launched in 2014. Major requirements of GOSAT-2 spacecraft are summarized below.

 

Major requirements of GOSAT-2 spacecraft as of May 2014
  GOSAT-2 GOSAT
Orbit type Sun synchronous Sun synchronous
Local equator crossing time in a descending node 13:00 ± 0:15 13:00 ± 0:15
Altitude 613 km 666 km
Repeat cycle 6 days 3 days
Dimension (Main body) 5.3 x 2.0 x 2.8 m 3.7 x 1.8 x 2.0 m
Mass < 2,000 kg 1,750 kg
Power 5.0 KW 3.8 KW

 

InstrumentsInstruments

 

GOSAT-2 spacecraft will carry two earth observation instruments, FTS-2 (Fourier Transform Spectrometer 2) and CAI-2 (Cloud and Aerosol Imager 2).

 

FTS-2 is a Fourier transform spectrometer with along and cross track pointing mechanism. It observes the sun light reflected by the earth's surface or scattered by clouds or aerosols (Band 1, 2, and 3) and the thermal emission from both the earth's surface and the atmosphere (Band 4 and 5). The intensity of the observed light is recorded with a very small spectral interval.

 

Major requirements of FTS-2 as of May 2014.
 Band 1Band 2Band 3Band 4Band 5
Target Gases O2 CO2, CH4, H2O CO2, CO, H2O  CH4, H2O  CO2, O3
Spectral Coverage (µm) 0.75 - 0.77 1.56 - 1.69 1.92 - 2.38 5.6 - 8.4 8.4 - 14.3
Spectral Coverage (cm-1) 12,950 - 13,250 5,900 - 6,400 4,200 - 5,200 1,188 - 1,800 700 - 1,188
Spectral Resolution 0.2 cm-1
Exposure 4 sec
IFOV 9.7 km
Pointing ±40 deg. (Along track), ±35 deg. (Cross track)
Polarimetry Yes (P and S channels) No

 

CAI-2 is a pushbroom imaging system with ten bands in the ultra violet, visible, near infrared, and short wavelength infrared region. Five of the ten bands observe in the forward direction and the other five observe in the backward direction.

 

Major requirements of CAI-2 as of May 2014.
 B1B2B3B4B5B6B7B8B9B10
Spectral Band (nm) 333 - 353 433 - 453 664 - 684 859 - 879 1585 - 1675 370 - 390 540 - 560 664 - 684 859 - 879 1585 - 1675
Tilt +20 deg. (Forward viewing) -20 deg. (Backward viewing)
Spatial Resolution 460 m 920m 460 m 920m
Swath 920 km

 

 

Updated: May 26, 2017