Development of a pre-launch absolute radiometric calibration test plan for CLARREO pathfinder

Zhipeng Wang; Kurtis Thome; Ronald Lockwood; Brian N. Wenny

doi:10.1117/12.2675648

20 October 2023 Development of a pre-launch absolute radiometric calibration test plan for CLARREO pathfinder

Zhipeng Wang, Kurtis Thome, Ronald Lockwood, Brian N. Wenny

Proceedings Volume 12688, Imaging Spectrometry XXVI: Applications, Sensors, and Processing; 126880E (2023) https://doi.org/10.1117/12.2675648
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The HyperSpectral Imager for Climate Science (HySICS) is the sensor payload for the Climate Absolute Radiance and Refractivity Observatory (CLARREO) Pathfinder (CPF) mission. It is scheduled to be launched to the International Space Station for its operational mission. HySICS, an Offner-Chrisp imaging spectrometer, is designed to measure spectral reflectance of the Earth across the full reflective solar region of 350-2300 nm at a radiometric uncertainty requirement of 0.6% (k=2), representing a nearly threefold improvement over existing space-borne spectrometers. An independent calibration (IndCal) approach that relies on a pre-launch, detector- based, absolute radiometric calibration (RadCal) with a transfer to orbit using a high-fidelity instrument model will be used to demonstrate that HySICS meets this level of uncertainty. The activities, plans, procedures, personnel, facilities, and equipment needed for a successful pre-launch IndCal testing, in which the instrument's absolute spectral responses (ASRs) are measured by the Goddard Laser for Absolute Measurement of Radiance (GLAMR), are documented in this paper. A Monte-Carlo simulation of the GLAMR testing is run to predict the instrument's outputs, to identify the calibration error sources and verify the error budget. The trades between the various testing needs of the GLAMR calibration are presented. The resulting test plan is shown that was developed based on the modeling to fit within the testing schedule while optimizing the science needed for CPF0s inter-calibration, spectral line shape assessments, and accuracy of the independent calibration. The HySICS GLAMR testing marks the first application of the detector-based absolute radiometric calibration to an operational space-borne imaging spectrometer.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhipeng Wang, Kurtis Thome, Ronald Lockwood, and Brian N. Wenny "Development of a pre-launch absolute radiometric calibration test plan for CLARREO pathfinder", Proc. SPIE 12688, Imaging Spectrometry XXVI: Applications, Sensors, and Processing, 126880E (20 October 2023); https://doi.org/10.1117/12.2675648

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