Description
Global monitoring of the Earth radiation, one of the missions of FY-3 satellite, is carried out by two
instruments: the Earth Radiation Measurement (ERM) and the Solar Irradiance Monitor (SIM).
Two products are generated from the measurement: the solar constant and the earth reflected shortwave
and emitted long-wave radiative flux at the top of the atmosphere.
The ERM-I is a radiometer with 2 broadband channels that measure the earth-reflected solar flux and
earth-emitted thermal flux over total (0.2-50μm) and short (0.2-4.3μm) wavebands in two observing modes.
The cross-track scanning mode is possible for spatial resolution of 28km with 2-degree NFOVs, while the
nadir staring mode is with 120 degree WFOVs.
| Satellite |
FY-3A ,
FY-3B ,
FY-3C
|
| Mission |
Earth radiation budget |
| Instrument type |
Tow broad-band channels radiometer |
| Scanning technique |
Scanner: Swath 2200km cross-track scanning, 151 steps |
| Non-scanner: 120 degree angle |
| Time resolution |
Scanner: a scan takes 4s |
| Non-scanner: 2 samples per second |
| Spatial resolution |
28 km (scanner) |
Characteristics
| Channel |
Spectral interval |
Noise Equivalent Radiance |
Absolute accuracy |
SNR |
| Short-wave |
0.2~4.3 µm |
0.4 W⋅m-2⋅sr-1 |
1.5 W⋅m-2⋅sr-1 |
900 |
| Total radiance |
0.2~50 µm |
0.4 W⋅m-2⋅sr-1 |
1.1 W⋅m-2⋅sr-1 |
1250 |
Data and Products
Calibration and Validation
ERM-I calibration and validation
