![Page 1: ILS Knowledge Radiance Error 10 Times Smaller for ......Title Microsoft PowerPoint - Predina_Apodization_poster_3.ppt [Read-Only] Created Date 5/2/2002 5:45:03 PM](https://reader034.vdocuments.us/reader034/viewer/2022042207/5ea978fef63cd33eb4629217/html5/thumbnails/1.jpg)
ILS Knowledge& Apodization
Section 1 - 1
Radiance Error 10 Times Smaller for Hamming Apodized Case(Long Wave Band)
2% ILS ErrorYields 0.2%
Radiometric Bias(worse case)
0.25% ILS ErrorYields 0.025%
Radiometric Bias(worse case)
1% ILS ErrorYields 0.1%
Radiometric Bias(worse case)
![Page 2: ILS Knowledge Radiance Error 10 Times Smaller for ......Title Microsoft PowerPoint - Predina_Apodization_poster_3.ppt [Read-Only] Created Date 5/2/2002 5:45:03 PM](https://reader034.vdocuments.us/reader034/viewer/2022042207/5ea978fef63cd33eb4629217/html5/thumbnails/2.jpg)
ILS Knowledge& Apodization
Section 1 - 2
Radiance Error 10 Times Smaller for Blackman Apodized Case(Long Wave Band)
2% ILS ErrorYields 0.2%
Radiometric Bias(worse case)
0.25% ILS ErrorYields 0.025%
Radiometric Bias(worse case)
1% ILS ErrorYields 0.1%
Radiometric Bias(worse case)
![Page 3: ILS Knowledge Radiance Error 10 Times Smaller for ......Title Microsoft PowerPoint - Predina_Apodization_poster_3.ppt [Read-Only] Created Date 5/2/2002 5:45:03 PM](https://reader034.vdocuments.us/reader034/viewer/2022042207/5ea978fef63cd33eb4629217/html5/thumbnails/3.jpg)
ILS Knowledge& Apodization
Section 1 - 3
Conclusions from Study
• Apodization Effects– Use of Hamming or Blackman-Harris apodization function
significantly reduces the sensitivity to ILS errors when anoptically band limited signal is processed through aninterferometer (~10 times better)
– Spectral sidelobes contribute significant error in theunapodized case due to interaction with the interferometeroptical filter band edge
• Scene Effects– Clear scenes are most stressing case– Cloudy scenes can tolerate almost twice as much ILS error due
to the lower radiance present in these cases
• Recommended FWHM ILS SpecificationBand Recommended Radiometric
FWHM Uncertainty Bias ErrorLW <1.5% 0.11% maxMW <1.5% 0.15% maxSW <3.0% 0.15% max
109 sets of plotsevaluated
RecommendedILS Tolerance
for Hamming orBlackman Type
ILS