JPSS-1 VIIRS Pre-Launch Response Versus Scan Angle Testing and Performance

Moyer, David; McIntire, Jeff; Oudrari, Hassan; McCarthy, James K.; Xiong, Xiaoxiong; Luccia, Frank De

doi:10.3390/rs8020141

Cited by 32 publications

(41 citation statements)

References 16 publications

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“…The a i are free parameters used to fit the measured RVS to the measured AOI. The HAM AOI is related to the scan angle θ by the following [8]:…”

Section: Methodsmentioning

confidence: 99%

“…The test setup used to measure the JPSS-1 VIIRS RVS was described in detail in [8]; as the testing for JPSS-2 VIIRS RVS was very similar to the previous sensor build, only a brief description is included here.…”

Section: Testing Overviewmentioning

confidence: 99%

“…The RVS for all of the reflective bands and the DNB were fit using the approach outlined in Section 3 and [8]. Figure 1 shows an example of the un-normalized RVS fitting for band M1, HAM side A.…”

Section: Reflective Band Performancementioning

confidence: 99%

“…In previous work [8], the SVS, HAM, and RTA were assumed to have the same temperature. This simplifies Equation (6) to the form…”

Section: Thermal Bandsmentioning

confidence: 99%

“…The RVS was also characterized for the two preceding VIIRS sensors pre-launch [7,8]. The testing methodology has largely remained consistent between the three sensor builds.…”

Section: Introductionmentioning

confidence: 99%

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Pre-Launch JPSS-2 VIIRS Response versus Scan Angle Characterization

et al. 2017

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On-orbit whisk-broom sensors have scanning mirror assemblies, whose reflectance variations with scan angle must be characterized prior to launch. One such instrument is the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Joint Polar Satellite System 2 (JPSS-2) platform. The scanning optics inside VIIRS includes a four mirror rotating telescope assembly (RTA) and a half angle mirror (HAM), rotating at half the speed of the RTA, which de-rotates the light before it enters the aft-optics assembly. The angle of incidence (AOI) on the HAM varies with scan angle; all of the other optical components in VIIRS have a fixed AOI with scan angle. In general, the reflectance of the HAM will vary with AOI. This parameter is difficult to quantify once in orbit and therefore must be characterized pre-launch. Ground measurements were performed in the summer of 2016 to determine the relative reflectance change of the instrument with scan angle, referred to as the response versus scan angle (RVS). This work will describe the RVS testing performed and the results obtained, including an atmospheric water vapor correction and an uncertainty analysis. Results indicate that the reflectance variation with scan angle is small for spectral bands between 0.4 µm and 4 µm (less than 2% over the full range of AOI); in contrast, the reflectance variation is between 3% and 10% for the spectral bands in the 8 µm to 12 µm range. Uncertainties are below 0.05% in the reflective solar spectral region and below 0.26% in the thermal emissive spectral region. Comparisons to previous VIIRS builds (on the SNPP and JPSS-1 satellites) show comparable performance.

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“…The a i are free parameters used to fit the measured RVS to the measured AOI. The HAM AOI is related to the scan angle θ by the following [8]:…”

Section: Methodsmentioning

confidence: 99%

Section: Testing Overviewmentioning

confidence: 99%

Section: Reflective Band Performancementioning

confidence: 99%

“…In previous work [8], the SVS, HAM, and RTA were assumed to have the same temperature. This simplifies Equation (6) to the form…”

Section: Thermal Bandsmentioning

confidence: 99%

“…The RVS was also characterized for the two preceding VIIRS sensors pre-launch [7,8]. The testing methodology has largely remained consistent between the three sensor builds.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations