A Fully-Focused SAR Omega-K Closed-Form Algorithm for the Sentinel-6 Radar Altimeter: Methodology and Applications

The two-dimensional frequency-based omega-K method is known to be a suitable algorithm for Fully-Focused SAR (FF-SAR) radar altimeter processors, as its computational efficiency is much higher than equivalent time-based alternatives without much performance degradation. In this paper we provide a cl...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2024-01, Vol.62, p.1-1
Main Authors: Hernandez-Burgos, Sergi, Gibert, Ferran, Broquetas, Antoni, Kleinherenbrink, Marcel, De la Cruz, Adrian Flores, Gomez-Olive, Adria, Garcia-Mondejar, Albert, Aparici, Monica Roca i
Format: Article
Language:English
Subjects:
Algorithms
Altimeters
Altimetry
Closed form solutions
delay/Doppler altimetry
Earth
Exact solutions
Fully-Focused SAR
Microprocessors
omega-K
Performance degradation
Program processors
Radar
Radar altimeters
Radar antennas
Radio altimeters
SAR (radar)
SAR altimetry
Satellites
Spaceborne radar
Swell
Synthetic aperture radar
synthetic aperture radar (SAR)
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Summary:The two-dimensional frequency-based omega-K method is known to be a suitable algorithm for Fully-Focused SAR (FF-SAR) radar altimeter processors, as its computational efficiency is much higher than equivalent time-based alternatives without much performance degradation. In this paper we provide a closed-form description of a two-dimensional frequency domain omega-K algorithm specific for instruments such as Poseidon-4 onboard Sentinel-6. The processor is validated with real data from point targets and over open ocean. Applications such as ocean swell retrieval and lead detection are demonstrated, showing the potentiality of the processor for future operational global-scale products.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2024.3367544