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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - The Effects of VIIRS Spectral Response Differences between Suomi NPP and NOAA-20 for the Thermal Emissive Bands
摘要： The NOAA-20 satellite was successfully launched on November 18, 2017 into an afternoon orbit with local equator crossing time ~1:30pm, in the same orbital plane as that of the Suomi National Polar-orbiting Partnership (NPP) but with a time separation of half an orbit or ~50 minutes. The Visible Infrared Imaging Radiometer Suite (VIIRS) onboard NOAA-20 will become the primary operational imager succeeding the VIIRS onboard Suomi NPP which has been in-orbit for more than six years. Although the VIIRS onboard Suomi NPP and NOAA-20 have identical design, there are small differences in the relative spectral response (RSR) in most bands. Previous studies have shown that minor differences in RSR can lead to a number of effects at detector level, such as striping. This study investigates the VIIRS RSR differences between Suomi NPP and NOAA-20 for the Thermal Emissive Bands (TEB) including M12-M16. The Line-By-Line radiative transfer model (LBLRTM) is used at very high spectral resolution for convolving with the RSR of VIIRS on both satellites. The impact of RSR difference between Suomi NPP and NOAA-20 are evaluated for radiometric biases and potential striping in TEB. This study will contribute to the measurement consistency for the long term observations in the thermal infrared bands, and ensure the quality of the data produced by VIIRS, such as sea surface temperature (SST), fire and other retrievals.
关键词： Spectral Response Function,LBLRTM,VIIRS,Thermal Emissive Band
更新于2025-09-23 15:21:21
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[IEEE 2019 Sixteenth International Conference on Wireless and Optical Communication Networks (WOCN) - Bhopal, India (2019.12.19-2019.12.21)] 2019 Sixteenth International Conference on Wireless and Optical Communication Networks (WOCN) - WIMAX Smart Grid Communication network for a Substation
摘要： This multidisciplinary paper reports on a research application-led study for predicting atmospheric attenuation, and tries to bridge the knowledge gap between applied engineering and atmospheric sciences. As a useful comparative baseline, this paper focuses specifically on atmospheric attenuation under pristine conditions, over the extended terahertz spectrum. Three well-known simulation software packages (‘HITRAN on the Web’, MODTRAN R(cid:13)4, and LBLRTM) are compared and contrasted. Techniques used for modeling atmospheric attenuation have been applied to investigate the resilience of (ultra-)wide fractional bandwidth applications to the effects of molecular absorption. Two extreme modeling scenarios are investigated: horizontal path links at sea level and Earth-space path links. It is shown by example that a basic software package (‘HITRAN on the Web’) can give good predictions with the former, whereas sophisticated simulation software (LBLRTM) is required for the latter. Finally, with molecular emission included, carrier-to-noise ratio fade margins can be calculated for the effects of line broadening due to changes in macroscopic atmospheric conditions with sub-1-THz ultra-narrow fractional bandwidth applications. Outdoors can be far from pristine, with additional atmospheric contributions only briefly introduced here; further discussion is beyond the scope of this paper, but relevant references have been cited.
关键词： molecular emission,atmospheric attenuation,carrier-to-noise,MODTRAN R(cid:13),THz Torch,HITRAN,thermal infrared,transmittance,THz,LBLRTM,molecular absorption
更新于2025-09-23 15:19:57