Journal
2022 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP)
Volume -, Issue -, Pages 1536-1540Publisher
IEEE
DOI: 10.1109/ICASSP43922.2022.9746889
Keywords
Variational model; deep learning; data assimilation; calibration; satellite altimetry
Funding
- CNES
- CLS
- ANR Melody Oceanix
- IDRIS
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Satellite radar altimeters are important for observing ocean surface dynamics. Current technology cannot resolve scales smaller than 100km, but upcoming wide-swath altimeter missions may help. Preprocessing stages are necessary for mapping techniques, and a data-driven framework can improve calibration and interpolation.
Satellite radar altimeters are a key source of observation of ocean surface dynamics. However, current sensor technology and mapping techniques do not yet allow to systematically resolve scales smaller than 100km. With their new sensors, upcoming wide-swath altimeter missions such as SWOT should help resolve finer scales. Current mapping techniques rely on the quality of the input data, which is why the raw data go through multiple preprocessing stages before being used. Those calibration stages are improved and refined over many years and represent a challenge when a new type of sensor start acquiring data. Here we show how a data-driven variational data assimilation framework could be used to jointly learn a calibration operator and an interpolator from non-calibrated data. The proposed framework significantly outperforms the operational state-of-the-art mapping pipeline and truly benefits from wide-swath data to resolve finer scales on the global map as well as in the SWOT sensor geometry.
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