Advanced ocean wave retrieval from time series of spotlight SAR subaperture images

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The retrieval of ocean wave spectra from SAR images is a challenging problem because the imaging mechanism is nonlinear, the image spectrum contains contributions of speckle noise, and the interpretation of a SAR image as a single snapshot in time causes directional ambiguities. We present a new wave retrieval methodology that overcomes these problems to a significant extent by utilizing spotlight-mode SAR images from TerraSAR-X and COSMO-SkyMed in combination with advanced subaperture processing. The long integration times of spotlight-mode images enable us to derive time series of subaperture images for periods of up to a few seconds, which show the propagation directions and speeds of moving patterns. Then we can use Fourier analysis and a filter based on the known dispersion relation of ocean waves to separate actual ocean wave signatures in the data from other contributions. This process is phase-preserving and lets us reconstruct short "videos" of the spatio-temporal evolution of the ocean wave signatures during the SAR overpass, which are easier to invert into surface slope and elevation fields and the corresponding wave spectra than conventional SAR intensity images.

Original languageEnglish (US)
Title of host publicationEUSAR 2018 - 12th European Conference on Synthetic Aperture Radar, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1320-1321
Number of pages2
Volume2018-June
ISBN (Electronic)9783800746361
StatePublished - Jan 1 2018
Event12th European Conference on Synthetic Aperture Radar, EUSAR 2018 - Aachen, Germany
Duration: Jun 4 2018Jun 7 2018

Other

Other12th European Conference on Synthetic Aperture Radar, EUSAR 2018
CountryGermany
CityAachen
Period6/4/186/7/18

Fingerprint

Water waves
retrieval
Time series
oceans
Wave filters
Fourier analysis
Speckle
signatures
Imaging techniques
ambiguity
preserving
Processing
methodology
slopes
filters
propagation
causes

ASJC Scopus subject areas

  • Signal Processing
  • Instrumentation

Cite this

Romeiser, R., & Graber, H. C. (2018). Advanced ocean wave retrieval from time series of spotlight SAR subaperture images. In EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar, Proceedings (Vol. 2018-June, pp. 1320-1321). Institute of Electrical and Electronics Engineers Inc..

Advanced ocean wave retrieval from time series of spotlight SAR subaperture images. / Romeiser, Roland; Graber, Hans C.

EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar, Proceedings. Vol. 2018-June Institute of Electrical and Electronics Engineers Inc., 2018. p. 1320-1321.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Romeiser, R & Graber, HC 2018, Advanced ocean wave retrieval from time series of spotlight SAR subaperture images. in EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar, Proceedings. vol. 2018-June, Institute of Electrical and Electronics Engineers Inc., pp. 1320-1321, 12th European Conference on Synthetic Aperture Radar, EUSAR 2018, Aachen, Germany, 6/4/18.
Romeiser R, Graber HC. Advanced ocean wave retrieval from time series of spotlight SAR subaperture images. In EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar, Proceedings. Vol. 2018-June. Institute of Electrical and Electronics Engineers Inc. 2018. p. 1320-1321
Romeiser, Roland ; Graber, Hans C. / Advanced ocean wave retrieval from time series of spotlight SAR subaperture images. EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar, Proceedings. Vol. 2018-June Institute of Electrical and Electronics Engineers Inc., 2018. pp. 1320-1321
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