1. GIFTS System Calibration Requirements Flowdown
Hank Revercomb
9 March 2004

2. GIFTS Overall Absolute Calibration Budget
Subject of BB CDR

3. GIFTS Top-level Absolute Calibration Budget

4. GIFTS Spectral Calibration Budget
Standard Atmosphere used for conversion to brightness temperature **
**3-sigma for single sample is 3 ppm-100 sample average assumed

5. GIFTS Radiometric Calibration Budget (Absolute)

6. GIFTS Radiometric Calibration Equation: Basis for Uncertainty Modeling
Radiance N derived from raw spectra of Earth (CE), Space (CS), and the internal Hot (CH) and Cold (CC) Blackbodies
t is the signal transmission of the telescope mirrors & m is the transmission of the Blackbody pick-off mirror
Bi is the Radiance from the Hot, Cold, and Space References
[eg. BH=H B(TH) + (1- H) B(Tstr), where B(T) is the Planck function and
Tstr is the effective structure temperature for reflection]

7. GIFTS Absolute Calibration-Longwave
Longwave Band (800 cm-1)
Tc=255, Th=290, Ts=240, Tt=280
Requirement
External BB
GIFTS
(excluding uncertainty in correction for Non-linearity & Polarization)

8. GIFTS Absolute Calibration-Shortwave
Shortwave Band (1800 cm-1)
Tc=255, Th=290, Ts=240, Tt=280
Requirement
External BB
GIFTS
(excluding uncertainty in correction for Non-linearity & Polarization)

9. GIFTS Calibration Error Sources-LW
Longwave Band (800 cm-1)
Tc=255, Th=290, Ts=240, Tt=280
0.3%
NEN/4=0.05
0.3 K

10. GIFTS Calibration Error Sources-SW
Shortwave Band (1800 cm-1)
Tc=255, Th=290, Ts=240, Tt=280
0.5%
NEN/4=0.0025
0.3 K

11. GIFTS Blackbody Budget
Subject of this BB Subsystem CDR: Budget is 0.5 K 3-sigma Absolute & 0.1 K 3-sigma Reproducibility, by analogy