SIM-II is an improved version of SIM-I. The FOV of radiometer is 2 degree instead of 13.3 degree with the new tracking system. The temperature control is improved better than 0.3℃.
FY-3C SIM-II has two absolute radiometers, one radiometer performs normal observation, the other one is observed 1 day in a month for degradation monitor.
FY-3E SIM-II has three absolute radiometers supported for an improving monitor on ageing. A new observation mode is designed with 2 minutes period which can capture solar irradiance on each orbit 11 times.
Satellite | FY-3C , FY-3E , FY-3F | |
---|---|---|
Spectral coverage | 0.2~20μm | |
Observability of irradiance | 0~1450Wm-2 | |
Calibration accuracy | ≤0.1% | |
Sensitivity | ≤0.05Wm-2 | |
Observation interval | ≤8min |
Satellite | Instrument | Datasets |
---|---|---|
FY-3E | SIM-II | L1 data |
FY-3C | SIM-II | L1 data |