GIFTS System Calibration Requirements Flowdown

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Presentation transcript:

GIFTS System Calibration Requirements Flowdown Hank Revercomb 9 March 2004

GIFTS Overall Absolute Calibration Budget Subject of BB CDR

GIFTS Top-level Absolute Calibration Budget

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

GIFTS Radiometric Calibration Budget (Absolute)

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]

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)

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)

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

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

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