An empirical bispectrum model for sea surface scattering

The properties of a surface bispectrum are found by generating a skewed surface on a digital computer and then evaluating its correlation function, bicoherence function, power spectrum, and bispectrum. The bispectrum is defined to be the Fourier transform of the bicoherence function. It is found tha...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 1993-07, Vol.31 (4), p.830-835
Main Authors: Chen, K.S., Fung, A.K., Amar, F.
Format: Article
Language:English
Subjects:
Azimuthal angle
Backscatter
Earth, ocean, space
Exact sciences and technology
External geophysics
Fourier transforms
Frequency
Integral equations
Marine
Physics of the oceans
Polarization
Power generation
Scattering
Sea surface
Surface waves, tides and sea level. Seiches
Wind speed
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Summary:The properties of a surface bispectrum are found by generating a skewed surface on a digital computer and then evaluating its correlation function, bicoherence function, power spectrum, and bispectrum. The bispectrum is defined to be the Fourier transform of the bicoherence function. It is found that the surface bicoherence function and its first and second derivatives must all vanish at the origin. In general, the surface bispectrum is a complex function. Its real part is centrosymmetric, just like the surface spectrum, and its imaginary part is antisymmetric. A function with the above-stated properties is introduced to represent the imaginary part of the sea surface bispectrum. The unknown parameter in this function is calibrated using a data set from the FASINEX experiment. The sea surface backscattering model is based on an integral equation model which accounts for frequency, polarization, incident angle, azimuthal angle, and wind speed. It is found that the proposed bispectrum can be used to account for the up/down wind asymmetry.< >
ISSN:0196-2892
1558-0644
DOI:10.1109/36.239905