Modeling the azimuthal dependence of sea surface backscatter during CST-7

Abstract

The operator expansion method is applied to realizations of 2-D roughness measured during CST-7 in order to probe the azimuthal dependence of the backscatter from time-evolving, non-fully developed seas which contain swell from distant surface wave sources. To use wave buoy measured data without extrapolation in frequency beyond the measured surface wave spectra, the measured frequencies examined will be limited to 75 and 150 Hz. The modeling goal will be to determine that if surface scatter was alone responsible for acoustic backscatter from the surface, could there be a measurable azimuthal dependence in the scattering during this experiment? Comparisons to some available measured azimuthal dependence will be shown.