Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 4, pp. 51-59
Development of an empirical model for radar backscattering cross section of the ocean surface at grazing angles
A.V. Ermoshkin
1 , V.V. Bakhanov
1 , N.A. Bogatov
1 1 Institute of Applied Physics RAS, Nizhniy Novgorod, Russia
The work is devoted to the development of an empirical model of radar backscattering cross section of the ocean surface at grazing angles. Simulation results based on the composite scattering model taking into account the effect of breaking waves demonstrated a good agreement with experimental data obtained using non-coherent marine X-band radar on horizontal polarization. Radar data were obtained during field experiments in the Black and Kara Seas. It is shown that the experimental dependence of backscattering microwave power is well described by an exponential function of wind speed. For purposes of radar scattering modeling, the sea surface was described by Elfouhaily spectrum depending on wave age and wind speed. To describe the fraction of sea surface covered by breaking waves an empirical expression was proposed as a function of wind speed at the standard height. The described model can be used to solve the inverse problem of remote sensing.
Keywords: radar, composite model, breaking wave, surface waves
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