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

Fulbright, Jon P.; Lei, Ning; Chiang, K.; Xiong, Xiaoxiong

doi:10.1117/12.930494

Cited by 34 publications

(25 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The SD may have non-negligible SD degradation at the wavelength of the shortest SWIR band, M8 (1238 nm), and the degradation is estimated to be around 0.5% [8,34,35]. The VIIRS SD on-orbit degradation, h(λ), is tracked by the on-board SDSM calibration, as mentioned previously [6][7][8]. VIIRS SDSM calibration was performed for every orbit in the first few months on orbit, and then the operational rate was reduced to once per day, and further reduced to once every two days after 16 May 2014.…”

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

“…So far, more than 1730 SDSM measurements have been performed for VIIRS. The SDSM has eight detectors with different center wavelengths tracking the SD degradation at the eight wavelengths [6][7][8]. Figure 5 shows the SD degradation derived from the SDSM measurements in symbols.…”

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

“…The BRF of the SD was measured prelaunch and validated on-orbit using the measurements with yaw maneuvers [9,15,16,32]. The on-orbit degradation of the SD BRF is tracked by an SDSM [6][7][8]. To prevent saturation of the RSB, a screen is placed in the front of the SD port to reduce the intensity of the sunlight.…”

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

“…τ SDS is the VF of the SD screen, h(λ) is the on-orbit SD degradation, called H-factors [6][7][8], tracked by the SDSM and is normalized to 28 October 2011, and d VS is the VIIRS-Sun distance. Both the BRF and the VF vary with the incident direction of the sunlight, which can be described by two independent solar angles.…”

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

“…The VIIRS RSB are calibrated on-orbit with an on-board solar diffuser (SD) [3][4][5], whose performance and degradation is itself tracked by a solar diffuser stability monitor (SDSM) [6][7][8]. The VIIRS RSB on-orbit changes are also monitored with scheduled monthly lunar observations through the instrument's space view (SV) port [9][10][11][12], which is also used to provide the instrument's dark scene response.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

VIIRS Reflective Solar Bands Calibration Progress and Its Impact on Ocean Color Products

Sun

Wang

2016

Remote Sensing

View full text Add to dashboard Cite

Abstract:The radiometric calibration for the reflective solar bands (RSB) of the Visible Infrared Imaging Radiometer Suite (VIIRS) on board the Suomi National Polar-orbiting Partnership (SNPP) platform has reached a mature stage after four years since its launch. The characterization of the vignetting effect of the attenuation screens, the bidirectional reflectance factor of the solar diffuser, the degradation performance of the solar diffuser, and the calibration coefficient of the RSB have all been made robust. Additional investigations into the time-dependent out-of-band relative spectral response and the solar diffuser degradation non-uniformity effect have led to newer insights. In particular, it has been demonstrated that the solar diffuser (SD) degradation non-uniformity effect induces long-term bias in the SD-calibration result. A mitigation approach, the so-called Hybrid Method, incorporating lunar-based calibration results, successfully restores the calibration to achievẽ 0.2% level accuracy. The successfully calibrated RSB data record significantly impacts the ocean color products, whose stringent requirements are especially sensitive to calibration accuracy, and helps the ocean color products to reach maturity.

show abstract

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

Section: Sd and Sdsm Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

VIIRS Reflective Solar Bands Calibration Progress and Its Impact on Ocean Color Products

Sun

Wang

2016

Remote Sensing

View full text Add to dashboard Cite

show abstract

VIIRS day/night band radiometric calibration stability monitoring using the Moon

et al. 2017

Self Cite

View full text Add to dashboard Cite

The Visible Infrared Imaging Radiometer Suite (VIIRS) is a passive scanning spectroradiometer on board the Suomi‐NPP satellite. It has 22 spectral bands including the day/night band (DNB), which is a panchromatic reflective solar band (RSB) covering a wavelength range of 500–900 nm. Similar to other RSBs, the radiometric calibration of the DNB is in reference to the sunlight reflected from an onboard solar diffuser (SD). As an independent validation to the SD measurement, lunar calibration has been regularly scheduled at nearly constant lunar phase. In this paper, the lunar calibration strategies developed for RSB are extended to DNB. The on‐orbit gain coefficient, or the so‐called F factor, is derived for DNB low‐gain stage (LGS) from lunar data for each lunar calibration event. Its on‐orbit change is compared with the change of the LGS SD F factor. For more accurate comparison, the impact of the on‐orbit relative spectral responses (RSR) change, caused by the wavelength‐dependent degradation of the optical throughput of VIIRS telescope mirrors, must be considered. This impact is more significant for DNB than other RSBs because of its wider bandwidth, and the impact to the SD and lunar calibrations are different due to different scene spectra. Simulation results show a gradually increased deviation of 1% between SD and lunar trends since launch till now and 0.3% deviation since 2 April 2012 lunar calibration, when the lunar F factor was firstly calculated, till now. Taking this effect into account, the on‐orbit changes of the SD F factor and lunar F factor agree with each other in less than 0.3%. Our results validate the stability of the DNB SD calibration while demonstrating how the on‐orbit RSR change should be considered in the radiometric calibration and data usage.

show abstract

A method for monitoring solar diffuser’s bidirectional reflectance distribution function degradation in geostationary orbit

Wang

Zhang

et al. 2020

European Journal of Remote Sensing

View full text Add to dashboard Cite

The advanced geosynchronous radiation imager (AGRI) is a geostationary sensor whose reflective solar band is calibrated by a solar diffuser (SD). The SD bidirectional reflectance distribution function (BRDF) degrades over time in the space environment. This degradation can be measured through the SD reflectance degradation monitor (SDRDM). The SDRDM calibration data are normally collected by three filtered detectors, covering wavelengths from 0.45μm to 0.90μm. The SD reflectance degradation can be derived by trending the ratio of the background-subtracted solar-angle corrected SDRDM sun and SD view responses. The conventional monitoring methods rely on geometry factors of the sun view port and the relative BRDF of the SD, and these parameters can cause uncertainties. Aiming at these uncertain factors, the present study collects calibration data at the same solar angle. This method compares the detector digital counts obtained at different times but with the same solar angle. Consequently, it cancels out the angle-dependent parameter to obtain the ratio of the BRDF degradation factors. The obtained results show that monitoring uncertainty of the proposed method is less than 0.18%, while the corresponding monitoring error is less than 0.66%. This method can be applicated in SD's BRDF monitoring.

show abstract

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

Cited by 34 publications

References 4 publications

VIIRS Reflective Solar Bands Calibration Progress and Its Impact on Ocean Color Products

VIIRS Reflective Solar Bands Calibration Progress and Its Impact on Ocean Color Products

VIIRS day/night band radiometric calibration stability monitoring using the Moon

A method for monitoring solar diffuser’s bidirectional reflectance distribution function degradation in geostationary orbit

Contact Info

Product

Resources

About