An Improved Semi-Empirical Model for Radar Backscattering from Rough Sea Surfaces at X-Band

An Improved Semi-Empirical Model for Radar Backscattering from Rough Sea Surfaces at X-Band

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We propose an improved semi-empirical scattering model for X-band radar backscattering from rough sea surfaces.This new model has a wider validity range of wind speeds than does the existing semi-empirical australis palette sea spectrum (SESS) model.First, we retrieved the small-roughness parameters from the sea surfaces, which were numerically generated using the Pierson-Moskowitz spectrum and measurement datasets for various wind speeds.Then, we computed the backscattering coefficients of the small-roughness surfaces for various wind speeds using the integral equation method model.Finally, the large-roughness characteristics were taken into account fr9938 by integrating the small-roughness backscattering coefficients multiplying them with the surface slope probability density function for all possible surface slopes.

The new model includes a wind speed range below 3.46 m/s, which was not covered by the existing SESS model.The accuracy of the new model was verified with two measurement datasets for various wind speeds from 0.5 m/s to 14 m/s.