TY - GEN
T1 - A new technique for phase-resolving ocean wave observations by spaceborne spotlight-mode synthetic aperture radar
AU - Romeiser, Roland
AU - Graber, Hans C.
N1 - Funding Information:
This material is based upon research supported by the U.S. Office of Naval Research under award N000014-17-1-2172.
Publisher Copyright:
© 2018 IEEE
PY - 2018/10/31
Y1 - 2018/10/31
N2 - The retrieval of quantitative information on ocean waves from SAR images is a challenging problem because of the nonlinearities of the imaging mechanism, the presence of speckle noise, and the directional ambiguities associated with the interpretation of a SAR image as a single snapshot in time. We present a new methodology that overcomes some of these problems by utilizing spotlight-mode data from TerraSAR-X and COSMO-SkyMed in combination with advanced subaperture processing. We are able to derive short time series of subaperture images, which show propagation directions and speeds of moving patterns. Then we can use Fourier analysis and a dispersion relation filter to separate actual ocean wave signatures from other contributions. This process is phase-preserving and lets us reconstruct short "videos" of the spatio-temporal evolution of the extracted wave signatures, which are easier to invert into surface slope and elevation fields than conventional SAR images.
AB - The retrieval of quantitative information on ocean waves from SAR images is a challenging problem because of the nonlinearities of the imaging mechanism, the presence of speckle noise, and the directional ambiguities associated with the interpretation of a SAR image as a single snapshot in time. We present a new methodology that overcomes some of these problems by utilizing spotlight-mode data from TerraSAR-X and COSMO-SkyMed in combination with advanced subaperture processing. We are able to derive short time series of subaperture images, which show propagation directions and speeds of moving patterns. Then we can use Fourier analysis and a dispersion relation filter to separate actual ocean wave signatures from other contributions. This process is phase-preserving and lets us reconstruct short "videos" of the spatio-temporal evolution of the extracted wave signatures, which are easier to invert into surface slope and elevation fields than conventional SAR images.
KW - Ocean waves
KW - SAR
KW - Subaperture processing
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U2 - 10.1109/IGARSS.2018.8517526
DO - 10.1109/IGARSS.2018.8517526
M3 - Conference contribution
AN - SCOPUS:85063150708
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 146
EP - 148
BT - 2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 38th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018
Y2 - 22 July 2018 through 27 July 2018
ER -