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Communication Dans Un Congrès Année : 2021

An alternative concept for SMOS-HR: unfolding the brightness temperature map by along-the-track inversion of the Van Cittert-Zernike equation

Résumé

Launched in 2009, the SMOS satellite [1] produces observations of brightness temperature through passive microwave radiometry in the protected radio astronomy portion of the L-band. Although a given point on the Earth's surface may be visible for 100 consecutive correlator integration times, brightness temperature measurements are produced one correlation period at a time, producing temperature maps that are both noisy and folded due to the antenna array's undersampling of the u-v frequency plane. For a potential successor of SMOS, SMOS-HR [2], we show that a global inversion of the observation model (based on the Van Cittert-Zernike theorem) across the orbital trace could simultaneously unfold and denoise the observations. To this end, we take advantage of the shift-invariance of the inversion problem in geodesic coordinates.
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hal-04473838 , version 1 (24-02-2024)

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Max Dunitz, Hugo Marsan, Clement Monnier, Eric Anterrieu, Francois Cabot, et al.. An alternative concept for SMOS-HR: unfolding the brightness temperature map by along-the-track inversion of the Van Cittert-Zernike equation. 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), Nov 2021, Antibes, France. pp.457-462, ⟨10.1109/CAMA49227.2021.9703593⟩. ⟨hal-04473838⟩
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