1. 2017-03-21 (based on AHI / ABI / AMI)
Advanced Next Generation GEO Imagers – Calibration Challenges and Opportunities
(based on AHI / ABI / AMI)

2. 1st to 2nd Generation From Spinner to 3-Axis Stabilized GOES.
Major improvements
Increase duty time for ~5% to >80%.
Full-optical calibration.
Stable Si detectors.
Major challenges
Dependence of scan mirror emissivity on AOI.
Diurnal thermal stress
MBCC
Seasonal variation of star
Banding, striping (related to cal freq).

3. 2nd to 3rd Generation Three times more channels
From 5 bands to 16 bands.
Four times finer spatial resolution
IR (VIS) fom 4 km (1 km) to 2 km (0.5 km)
Five times faster scan
Full Disk scan from 26 min to 5 min
Six times better of data
Radiometric requirements
SNR for Visible from xxx (TBR) to xxx
NEdT for IR from xxxK to xxxK
Spectral requirements
Narrower by ~half to optimize applications

4. GOES SRF – RSB

5. GOES SRF – WV

6. Major Challenges
Hundreds (3 X 4 X 5 X 6) times of performance enhancement
Hundreds times of more detectors
1st challenge – Massive arrays of detectors
Uniformity – radiometric, imagery (striping)
Stitching – ~30 sec time difference
Redundancy – hedge against increase complexity
2nd challenge – Coordinate all those detectors
New paradigm of INR, from “shoot where pointed” to “point where shot”
Kalman filter, Re-sampling
3rd challenge – onboard calibration for VNIR
Non-trivial to move to geostationary platform

7. Some Opportunities Much more GEO-LEO collocations
No LEO is wasted.
Afford improved match in time and geometry
Investigate dependence on
Angle
Scene radiance
Cross-talk
Cross calibration for INR
Lunar calibration