Introduction of FY-4
FY-4 is the 2nd generation FengYun Geostationary meteorological satellite. The spacecraft has the following parameters:
Fig. FY-4A spacecraft.
Tab. FY-4 Spacecraft parameters.
Launch Weight |
approx. 5400kg |
Stabilization |
Three-axis |
Attitude accuracy |
3″ |
Bus |
1553B + Spacewire |
Raw data transmission |
X band |
Output power |
≥ 3200W |
Design life |
over 7 years |
Mission of FY-4
Mission objectives of CMA FengYun Geo. satellites are:
- Support nowcasting and severe weather warning.
- Support NWP (numerical weather prediction), regional and global.
- Support climate applications.
- Support environment and disaster monitoring.
Fig. Recent and future CMA FengYun Geo. missions.
Advancement of FY-4
Compared with FY-2:
|
FY-4A |
FY-2F/G |
Platform stabilization |
Three-axis stabilization |
Spin stabilization |
Working life in orbit |
7 years as designed |
3 years as designed |
Observation efficiency |
>85% |
appr. 5% |
Observation mode |
Imaging, sounding and lightning |
Imaging |
Main payloads |
AGRI |
VISSR |
Band range: 0.45~13.8μm |
Band range: 0.55~12.5μm |
Spatial resolution: 0.5~4km |
Spatial resolution: 1.25~5km |
Full disk time: 15 min |
Full disk time: 30 min |
Observation area: flexible |
Observation area: fixed |
GIIRS |
N/A |
Band range: 700~1130cm-1, 1650~2250cm-1 |
Spectrum resolution: 0.8cm-1, 1.6cm-1 |
Spatial resolution: 16km |
LMI |
N/A |
Band: 777.4±0.5nm |
Size: 2×300mm×400mm |
Spatial resolution: 7.8km |
Coverage: China and surrounding |
SEP |
SEM |
Particles, magnetic field |
Particles |
Compared with similar satellite worldwide:
|
FY-4 (China) |
GOES-R (USA) |
Himawari-8 (Japan) |
Imaging |
Spatial resolution |
VIS/NIR: 0.5~1km IR: 2~4km |
VIS/NIR: 0.5~1km IR: 2km |
VIS/NIR: 0.5~1km IR: 2km |
Time resolution |
15min |
5min |
10min |
No. bands |
14 |
16 |
16 |
Accuracy |
0.1K |
0.1K |
0.1K |
Sounding |
Spectrum range |
LWIR: 700~1130cm-1 (8.85~14.29μm) MWIR: 1650~2250cm-1 (4.44~6.06μm) |
N/A |
N/A |
No. Bands |
1650 |
Spectrum resolution |
0.625cm-1 |
Spatial resolution |
16km |
Lightning |
Central wavelength: 777.4nm Time resolution: 2ms |
Central wavelength: 777.4nm Time resolution: 2ms |
N/A |
Space |
Particles/magnetic field/X-ray |
Particles/magnetic field/Solar imaging |
N/A |