Performance of Terra MODIS solar diffuser and solar diffuser stability monitor

Xiong, X.; Erives, Hector; Xiong, Si; Xie, Xiaobo; Esposito, J. A.; Sun, Junqiang; Barnes, William

doi:10.1117/12.615334

Cited by 32 publications

(32 citation statements)

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“…6 This is not seen in the VIIRS data. The nearly flat SDSM response during the sweet spot period means that we will not have to rely on the data analysis method developed for MODIS data where the response is normalized by the red-most detector response.…”

Section: Introductionmentioning

confidence: 75%

Characterization and performance of the Suomi-NPP/VIIRS solar diffuser stability monitor

et al. 2012

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We describe the on-orbit characterization and performance of the Solar Diffuser Stability Monitor (SDSM) on-board Suomi-NPP/VIIRS. This description includes the observing procedure of each SDSM event, the algorithms used to generate the Solar Diffuser degradation corrective factors, and the results for the mission to date. We will also compare the performance of the VIIRS SDSM and SD to the similar components operating on the MODIS instrument on the EOS Terra and Aqua satellites.

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Section: Introductionmentioning

confidence: 75%

Characterization and performance of the Suomi-NPP/VIIRS solar diffuser stability monitor

et al. 2012

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“…9 Several algorithms were developed to remove the crosstalk contamination in these bands. Due to the large magnitude of the crosstalk and the many bands involved, these algorithms provided limited success.…”

Section: Introductionmentioning

confidence: 99%

Terra MODIS Band 27 Electronic Crosstalk Effect and Its Removal

Sun

Xiong

Madhavan

et al. 2014

IEEE Trans. Geosci. Remote Sensing

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The MODerate-resolution Imaging Spectroradiometer (MODIS) is one of the primary instruments in the NASA Earth Observing System (EOS). The first MODIS instrument was launched in December, 1999 on-board the Terra spacecraft. MODIS has 36 bands, covering a wavelength range from 0.4 µm to 14.4 µm. MODIS band 27 (6.72 µm) is a water vapor band, which is designed to be insensitive to Earth surface features. In recent Earth View (EV) images of Terra band 27, surface feature contamination is clearly seen and striping has become very pronounced. In this paper, it is shown that band 27 is impacted by electronic crosstalk from bands 28-30. An algorithm using a linear approximation is developed to correct the crosstalk effect. The crosstalk coefficients are derived from Terra MODIS lunar observations. They show that the crosstalk is strongly detector dependent and the crosstalk pattern has changed dramatically since launch. The crosstalk contributions are positive to the instrument response of band 27 early in the mission but became negative and much larger in magnitude at later stages of the mission for most detectors of the band. The algorithm is applied to both Black Body (BB) calibration and MODIS L1B products. With the crosstalk effect removed, the calibration coefficients of Terra MODIS band 27 derived from the BB show that the detector differences become smaller. With the algorithm applied to MODIS L1B products, the Earth surface features are significantly removed and the striping is substantially reduced in the images of the band. The approach developed in this report for removal of the electronic crosstalk effect can be applied to other MODIS bands if similar crosstalk behaviors occur.

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“…Figure 2, courtesy of Ball Aerospace, illustrates SNPP sensor placement on the spacecraft nadir (earth-viewing) mounting deck. 3,4,5,6,7 , VIIRS performed extensive pre-launch measurements in order to calibrate and characterize sensor radiometric, spectral, and spatial performance. Key radiometric measurements were made in different operational configurations (e.g.…”

Section: Introductionmentioning

confidence: 99%

VIIRS on-orbit optical anomaly: investigation, analysis, root cause determination and lessons learned

et al. 2012

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A gradual, but persistent, decrease in the optical throughput was detected during the early commissioning phase for the Suomi National Polar-Orbiting Partnership (SNPP) Visible Infrared Imager Radiometer Suite (VIIRS) Near Infrared (NIR) bands. Its initial rate and unknown cause were coincidently coupled with a decrease in sensitivity in the same spectral wavelength of the Solar Diffuser Stability Monitor (SDSM) raising concerns about contamination or the possibility of a system-level satellite problem.An anomaly team was formed to investigate and provide recommendations before commissioning could resume. With few hard facts in hand, there was much speculation about possible causes and consequences of the degradation. Two different causes were determined as will be explained in this paper. This paper will describe the build and test history of VIIRS, why there were no indicators, even with hindsight, of an on-orbit problem, the appearance of the on-orbit anomaly, the initial work attempting to understand and determine the cause, the discovery of the root cause and what Test-As-You-Fly (TAYF) activities, can be done in the future to greatly reduce the likelihood of similar optical anomalies. These TAYF activities are captured in the "lessons learned" section of this paper.

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Performance of Terra MODIS solar diffuser and solar diffuser stability monitor

Cited by 32 publications

References 0 publications

Characterization and performance of the Suomi-NPP/VIIRS solar diffuser stability monitor

Characterization and performance of the Suomi-NPP/VIIRS solar diffuser stability monitor

Terra MODIS Band 27 Electronic Crosstalk Effect and Its Removal

VIIRS on-orbit optical anomaly: investigation, analysis, root cause determination and lessons learned

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