Measuring crosstalk in MODIS spectral bands on-orbit using the SRCA

Daniel O. Link; Emily J. Aldoretta; Truman Wilson; Xiaoxiong Xiong

doi:10.1117/12.2568084

20 August 2020 Measuring crosstalk in MODIS spectral bands on-orbit using the SRCA

Daniel O. Link, Emily J. Aldoretta, Truman Wilson, Xiaoxiong Xiong

Proceedings Volume 11501, Earth Observing Systems XXV; 115010E (2020) https://doi.org/10.1117/12.2568084
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Near-identical MODIS instruments launched on-board the Terra and Aqua spacecraft in 1999 and 2002, respectively. Each MODIS instrument has 36 spectral bands covering 0.41 to 14.2 μm mounted among four focal plane assemblies, along with a series of on-board calibrators (OBCs) used to characterize the instrument performance on-orbit. One such OBC is the Spectro-radiometric Calibration Assembly (SRCA), which is a multi-function calibrator, able to provide calibration sources to measure spatial, spectral, or radiometric properties of the MODIS bands depending on its configuration. The MODIS instrument performance, including measurements of the signal cross-contamination (crosstalk) between bands, was measured on-orbit during early-mission characterization for both instruments. This crosstalk test used the SRCA in its spatial mode while utilizing the thin slit, which is normally used for spectral calibrations. A similar crosstalk test was recently performed for Terra MODIS. Since the Terra safe mode event in 2016, the PV LWIR bands specifically (6.7-9.7 μm) have shown increased influence from crosstalk. The process involved in preparing and performing this crosstalk test is included in this work, as well as the findings from the recent and previous SRCA-based crosstalk characterizations.

Conference Presentation

Citation Download Citation

Daniel O. Link, Emily J. Aldoretta, Truman Wilson, and Xiaoxiong Xiong "Measuring crosstalk in MODIS spectral bands on-orbit using the SRCA", Proc. SPIE 11501, Earth Observing Systems XXV, 115010E (20 August 2020); https://doi.org/10.1117/12.2568084

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