Description
Succeeding the IR channel settings of
MERSI-II, MERSI-LL has an additional low-light level channel
with wide spectral range, which gives FengYun satellite the ability of visible band observation at night-time
for the first time. MERSI-LL has 7 channels, including 1 low-light channel and 7 infrared channels.
The two infrared window channels have the spatial resolution of 250m at nadir and the others are 1000m.
Onboard calibration is the main calibration method for MERSI-LL, and it can provide full moon disk observation
for the lunar calibration. MERSI-LL has calibration requirements at least of 10% on low-light channel during
the day and 50% at night (the expected requirements reach 5% during the day and 10% at night), and the IR
channels calibration requirements are at least 0.4 K and expectation is 0.2 K.
Characteristics
| Satellite |
FY-3E
|
| Number of Channels |
7 |
| Spatial Resolution |
250m / 1000m |
Characteristics
| No. |
Center wavelength(μm) |
Bandwidth(nm) |
Spatial resolution (m) |
Minimum/expected sesitivity (SNR or NEΔT) |
Minimum/expected accuracy (% or T) |
| 1 |
0.7 |
400 |
1000 |
200 (Daytime)
|
10% / 5% (Daytime) |
| 7 (Nighttime) |
50% / 10% (Nighttime) |
| 2 |
3.8 |
180 |
1000 |
0.25K |
0.4K / 0.2K |
| 3 |
4.05 |
155 |
1000 |
0.25K |
0.4K / 0.2K |
| 4 |
7.2 |
500 |
1000 |
0.30K |
0.4K / 0.2K |
| 5 |
8.55 |
300 |
1000 |
0.25K |
0.4K / 0.2K |
| 6 |
10.8 |
1000 |
250 |
0.30K |
0.4K / 0.2K |
| 7 |
12.0 |
1000 |
250 |
0.30K |
0.4K / 0.2K |
Data and Products
Calibration and Validation
MERSI-LL calibration and validation
MERSI-LL SRF (ZIP)
