Practical Applications of Ethics Codes: Gifts Gifts Gifts – Court Employees Accepting Gratitude
GIFTS System Calibration Requirements Flowdown
description
Transcript of GIFTS System Calibration Requirements Flowdown
<GIFTS_Cal_Req.ppt>9 March 2004
GIFTS System Calibration Requirements Flowdown
Hank Revercomb
9 March 2004
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 2
GIFTS Overall Absolute Calibration Budget
Subject of BB CDR
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 3
GIFTS Top-level Absolute Calibration Budget
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 4
GIFTS Spectral Calibration Budget
**3-sigma for single sample is 3 ppm-100 sample average assumed
**
Standard Atmosphereused for conversion tobrightness temperature
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 5
GIFTS Radiometric Calibration Budget (Absolute)
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 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]
( ) SCH
SECH
t
m BCC
CCReBBN +⎟⎟
⎠
⎞⎜⎜⎝
⎛
−
−−⎟⎟
⎠
⎞⎜⎜⎝
⎛=τ
τ
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 7
GIFTS Absolute Calibration-Longwave
Longwave Band (800 cm-1)Tc=255, Th=290, Ts=240, Tt=280, Tm=250
0.00
0.20
0.40
0.60
0.80
1.00
1.20
190 210 230 250 270 290 310
Scene Temperature [K]
GIFTS
External BB
Requirement
(excluding uncertainty in correction forNon-linearity & Polarization)
Longwave Band (800 cm-1)Tc=255, Th=290, Ts=240, Tt=280
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 8
GIFTS Absolute Calibration-Shortwave
Shortwave Band (1800 cm-1)Tc=255, Th=290, Ts=240, Tt=280, Tm=250
0.00
0.20
0.40
0.60
0.80
1.00
190 210 230 250 270 290 310
Scene Temperature [K]
GIFTS
External BB
Requirement
(excluding uncertainty in correction forNon-linearity & Polarization)
Shortwave Band (1800 cm-1)Tc=255, Th=290, Ts=240, Tt=280
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 9
GIFTS Calibration Error Sources-LW
NEN/4=0.050.3% 0.3 K
Longwave Band (800 cm-1)Tc=255, Th=290, Ts=240, Tt=280, Tm=250
0.00
0.10
0.20
0.30
0.40
0.50
190 210 230 250 270 290 310
Scene Temperature [K]
GIFTS Nominal BB Tau Ratio Noise Residual Ttel changes
Longwave Band (800 cm-1)Tc=255, Th=290, Ts=240, Tt=280
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 10
GIFTS Calibration Error Sources-SW
0.5% NEN/4=0.0025 0.3 K
0.00
0.10
0.20
0.30
0.40
0.50
190 210 230 250 270 290 310
Scene Temperature [K]
GIFTS Nominal BB Tau Ratio Noise Residual Ttel changes
Shortwave Band (1800 cm-1)Tc=255, Th=290, Ts=240, Tt=280
<GIFTS_Cal_Req.ppt>9 March 2004
Slide 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