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12 July 2023 Imaging static Fourier transform spectrometry: impact of trajectory perturbations on the hyperspectral images
Varvara Chiliaeva, Olivier Gazzano, Yann Ferrec, Herve Sauer, Andrés Almansa, François Goudail
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Proceedings Volume 12777, International Conference on Space Optics — ICSO 2022; 127774H (2023) https://doi.org/10.1117/12.2690836
Event: International Conference on Space Optics — ICSO 2022, 2022, Dubrovnik, Croatia
Abstract
Imaging static Fourier transform spectrometry (isFTS) may be used for pushbroom air- or spaceborne hyperspectral remote sensing. In isFTS, the spectral information is multiplexed over several instantaneous images, and numerical reconstruction is needed to recover the full spectrum for each pixel. The registration of instantaneous images is a crucial step. Unsufficient precision leads to artefacts on the images and degradation of the estimated spectra. We developed a simulation program of the entire processing chain of an isFTS system that can reproduce the degradations of actual isFTS images. Using this program we studied spatial and spectral effects of temporally correlated and uncorrelated trajectory perturbations. We also performed a theoretical study to quantify these degradations. We demonstrated that the most significant degradations occur in the regions of high radiance gradient.
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Varvara Chiliaeva, Olivier Gazzano, Yann Ferrec, Herve Sauer, Andrés Almansa, and François Goudail "Imaging static Fourier transform spectrometry: impact of trajectory perturbations on the hyperspectral images", Proc. SPIE 12777, International Conference on Space Optics — ICSO 2022, 127774H (12 July 2023); https://doi.org/10.1117/12.2690836
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KEYWORDS
Image registration
Interferograms
Fourier transforms
Optical path differences
Hyperspectral imaging
Astronomical imaging
Staring arrays
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