SAR altimetry data as a new source for swell monitoring

Altiparmaki, O.; Kleinherenbrink, M.; Naeije, M.C.; Slobbe, D.C.; Visser, P.N.A.M.

doi:10.1029/2021GL096224

SAR altimetry data as a new source for swell monitoring

Title

SAR altimetry data as a new source for swell monitoring

Author

Altiparmaki, O. (TU Delft Astrodynamics & Space Missions)
Kleinherenbrink, M. (TU Delft Physical and Space Geodesy)
Naeije, M.C. (TU Delft Astrodynamics & Space Missions)
Slobbe, D.C. (TU Delft Physical and Space Geodesy)
Visser, P.N.A.M. (TU Delft Space Engineering; TU Delft Astrodynamics & Space Missions)

Department

Space Engineering

Date

2022

Abstract

This article shows the first spectral analysis of fully-focused Synthetic Aperture Radar (FFSAR) altimetry data with the objective of studying backscatter modulations caused by swells. Swell waves distort the backscatter in altimetry radargrams by means of velocity and range bunching. These swell signatures are visible in the tail of the waveform. By locally normalizing the backscatter and projecting the waveforms on an along-/cross-track grid, satellite altimetry can be exploited to retrieve swell information. The analysis of FFSAR spectra is supported by buoy-derived swell-wave spectra of the National Oceanic and Atmospheric Administration network. Using cases with varying wave characteristics, we discuss the altimetry-derived spectra and relate them to what is known from side-looking SAR imaging systems. Besides having a vast amount of additional data for swell-wave analysis, altimeter data can also help us to better understand the side-looking SAR spectra.

Subject

swell waves
FFSAR altimetry
velocity bunching
range bunching
spectral analysis

To reference this document use:

http://resolver.tudelft.nl/uuid:8d2bc42e-480a-4b25-aa65-e5b34517187e

DOI

https://doi.org/10.1029/2021GL096224

ISSN

0094-8276

Source

Geophysical Research Letters, 49 (7)

Part of collection

Institutional Repository