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Simulation of L-Band Bistatic Returns From the Ocean Surface: A Facet Approach With Application to Ocean GNSS Reflectometry

Simulation of L-Band Bistatic Returns From the Ocean Surface: A Facet Approach With Application to Ocean GNSS Reflectometry
Simulation of L-Band Bistatic Returns From the Ocean Surface: A Facet Approach With Application to Ocean GNSS Reflectometry
We present the implementation of a facet-based simulator
to investigate the forward scattering of L-band signals
from realistic sea surfaces and its application to spaceborne ocean Global Navigation Satellite System (GNSS) Reflectometry. This approach provides a new flexible tool to assess the influence of the ocean surface roughness on scattered GNSS signals. The motivation stems from the study by Clarizia et al., which revealed significant differences between delay–Doppler maps (DDMs) obtained from UK-DMC satellite data and DDMs simulated with the Zavorotny–Voronovich (Z-V) model. Here, the scattered power and polarization ratio (PR) are computed for explicit 3-D ocean
wave fields, using a novel implementation of the Kirchhoff approximation (KA), which we call the Facet Approach (FA). We find that the FA is consistent with the full KA and the Geometrical Optics (GO) used in the Z-V model, while being less computationally expensive than the KA and able to represent polarization effects not captured by the GO. Instantaneous maps of the bistatic normalized radar cross section computed with the FA show clear patterns associated with the underlying waves. The wave field is particularly visible in the PR, indicating that the scattering is generally dominated by the HH component, particularly from
ocean wave troughs. Polarization effects show, for the first time, a strong correlation to the explicit sea surface from which the scattering originated. DDMs of the scattered power computed with the FA reveal patchy patterns and power distributions that differ from those obtained with Z-V and show closer similarities with observed DDMs from UK-DMC.
Facet approach (FA), Global Navigation SatelliteSystem Reflectometry (GNSS-R), Kirchhoff approximation (KA), ocean waves, polarization, scattering
0196-2892
960-971
Clarizia, Maria Paola
c990fc40-109a-42cd-bc15-def020fd4dee
Gommenginger, Christine
f0db32be-34bb-44da-944b-c6b206ca4143
Di Bisceglie, Maurizio
4415c2e6-aa05-4173-968d-c80293ad1c1b
Galdi, Carmela
a43486b1-d927-4b35-b455-331b00344449
Srokosz, Meric A.
1e0442ce-679f-43f2-8fe4-9a0f0174d483
Clarizia, Maria Paola
c990fc40-109a-42cd-bc15-def020fd4dee
Gommenginger, Christine
f0db32be-34bb-44da-944b-c6b206ca4143
Di Bisceglie, Maurizio
4415c2e6-aa05-4173-968d-c80293ad1c1b
Galdi, Carmela
a43486b1-d927-4b35-b455-331b00344449
Srokosz, Meric A.
1e0442ce-679f-43f2-8fe4-9a0f0174d483

Clarizia, Maria Paola, Gommenginger, Christine, Di Bisceglie, Maurizio, Galdi, Carmela and Srokosz, Meric A. (2012) Simulation of L-Band Bistatic Returns From the Ocean Surface: A Facet Approach With Application to Ocean GNSS Reflectometry. IEEE Transactions on Geoscience and Remote Sensing, 50 (3), 960-971. (doi:10.1109/TGRS.2011.2162245).

Record type: Article

Abstract

We present the implementation of a facet-based simulator
to investigate the forward scattering of L-band signals
from realistic sea surfaces and its application to spaceborne ocean Global Navigation Satellite System (GNSS) Reflectometry. This approach provides a new flexible tool to assess the influence of the ocean surface roughness on scattered GNSS signals. The motivation stems from the study by Clarizia et al., which revealed significant differences between delay–Doppler maps (DDMs) obtained from UK-DMC satellite data and DDMs simulated with the Zavorotny–Voronovich (Z-V) model. Here, the scattered power and polarization ratio (PR) are computed for explicit 3-D ocean
wave fields, using a novel implementation of the Kirchhoff approximation (KA), which we call the Facet Approach (FA). We find that the FA is consistent with the full KA and the Geometrical Optics (GO) used in the Z-V model, while being less computationally expensive than the KA and able to represent polarization effects not captured by the GO. Instantaneous maps of the bistatic normalized radar cross section computed with the FA show clear patterns associated with the underlying waves. The wave field is particularly visible in the PR, indicating that the scattering is generally dominated by the HH component, particularly from
ocean wave troughs. Polarization effects show, for the first time, a strong correlation to the explicit sea surface from which the scattering originated. DDMs of the scattered power computed with the FA reveal patchy patterns and power distributions that differ from those obtained with Z-V and show closer similarities with observed DDMs from UK-DMC.

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More information

Published date: 2012
Keywords: Facet approach (FA), Global Navigation SatelliteSystem Reflectometry (GNSS-R), Kirchhoff approximation (KA), ocean waves, polarization, scattering
Organisations: Physical Oceanography, Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 336371
URI: http://eprints.soton.ac.uk/id/eprint/336371
ISSN: 0196-2892
PURE UUID: d555e87f-e41c-4a29-af46-275583ace603

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Date deposited: 22 Mar 2012 11:38
Last modified: 14 Mar 2024 10:41

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Contributors

Author: Maria Paola Clarizia
Author: Christine Gommenginger
Author: Maurizio Di Bisceglie
Author: Carmela Galdi
Author: Meric A. Srokosz

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