Introduction of FY-4B
FY-4 is the 2nd generation FengYun Geostationary meteorological satellite.
The first satellite of FY-4 series, FY-4A, was designed to be an R&D satellite and launched on December 11, 2016.
FY-4B, the second satellite of FY-4 series, was designed to be the first operational satellite of FY-4 series and
launched on June 3, 2021.
Fig. FY-4B spacecraft.
Tab. FY-4B Spacecraft parameters.
| Stabilization |
Three-axis |
| Attitude accuracy |
3″ |
| Raw data transmission |
X band |
| Design life |
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
Comparison with FY-2:
|
FY-4B (Operational) |
FY-4A (R&D) |
FY-2 (Operational) |
| Platform stabilization |
Three-axis stabilization |
Three-axis stabilization |
Spin stabilization |
| Working life in orbit |
7 years as ensured |
7 years as designed, 5 years as ensured |
3 years as designed |
| Observation efficiency |
>85% |
>85% |
appr. 5% |
| Observation mode |
Imaging, sounding and rapid imaging |
Imaging, sounding and lightning |
Imaging |
| Main payloads |
AGRI |
AGRI |
VISSR |
| Band range: 0.45~13.6μm |
Band range: 0.45~13.8μm |
Band range: 0.55~12.5μm |
| Spatial resolution: 0.5~4km |
Spatial resolution: 0.5~4km |
Spatial resolution: 1.25~5km |
| Full disk time: 15 min |
Full disk time: 15 min |
Full disk time: 30 min |
| Coverage: flexible |
Coverage: flexible |
Coverage: fixed |
| GIIRS |
GIIRS |
N/A |
| Band range: 680~1130 (700~1130 ensured)cm-1, 1650~2250cm-1 |
Band range: 700~1130cm-1, 1650~2250cm-1 |
| Spectrum resolution: 0.8cm-1 |
Spectrum resolution: 0.8cm-1, 1.6cm-1 |
| Spatial resolution: 12km |
Spatial resolution: 16km |
| GHI |
N/A |
N/A |
| Band range: all color, 0.445~12.5μm |
| Spatial resolution: 0.25~4km |
| Temporal resolution: <1 min (2000km×2000km) |
| N/A |
LMI |
N/A |
| Band: 777.4±0.5nm |
| Spatial resolution: 7.8km |
| Coverage: China and surroundings |
| SEP |
SEP |
SEM |
| Particles, magnetic field |
Particles, magnetic field |
Particles |
Comparison of worldwide new generation geostationary meteorological satellites:
|
FY-4B (China) |
GOES-R/S (USA) |
MTG-I+S (EU) |
Himawari-8/9 (Japan) |
| Imaging |
Spatial resolution |
0.5~4km
GHI: 0.25~2km |
0.5~2km |
0.5~2km |
0.5~2km |
| Temporal resolution |
Full disk: 15 min
GHI: 1min |
Full disk: 5 min |
Full disk: 10 min |
Full disk: 10 min |
| No. bands |
15
GHI: 7 |
16 |
16 |
16 |
| Sounding |
Spectrum range |
LWIR: 680~1130cm-1
MWIR: 1650~2250cm-1 |
N/A |
LWIR: 700~1210cm-1
MWIR: 1600~2175cm-1 |
N/A |
| Spectrum resolution |
<0.8cm-1 |
0.625cm-1 |
| Spatial resolution |
12km |
4km |
| Temporal resolution |
<1 hour |
1 hour |
| Space |
Particles/magnetic field |
Particles/magnetic field/Solar imaging |
N/A |
N/A |
