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

Methodology and Applications

Journal article (2024)

Authors

Sergi Hernandez Universitat Politecnica de Catalunya
Ferran Gibert IsardSAT
A. Broquetas Universitat Politecnica de Catalunya
M. Kleinherenbrink Mathematical Geodesy and Positioning - CEG
Research Group
Mathematical Geodesy and Positioning (CEG) (TU Delft)
Copyright: © 2024 Sergi Hernandez-Burgos, Ferran Gibert, Antoni Broquetas, M. Kleinherenbrink, Adrian Flores De la Cruz, Adria Gomez-Olive, Albert Garcia-Mondejar, Monica Roca i. Aparici
DOI
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https://doi.org/10.1109/TGRS.2024.3367544
Altimetry Earth SAR altimetry Synthetic aperture radar (SAR) Radar antennas Satellites Synthetic aperture radar Program processors Delay/Doppler altimetry Fully-Focused SAR Omega-K Spaceborne radar
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Published Date

2024

Language

English

Faculty

Civil Engineering & Geosciences

Department

Geoscience and Remote Sensing

Research Group

Mathematical Geodesy and Positioning

Abstract

The 2-D 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 article, we provide a closed-form description of a 2-D 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 the 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.