Abstract

In this paper the analytical expression of two-frequency mutual coherence function of the scattered wave from two-dimensional non-Gaussian rough ocean surfaces is derived first by the Kirchhoff approximation. The Gram-Charlier distribution instead of the conventional Gaussian distribution is utilized in carrying out the ensemble average operation in order to represent the asymmetric characteristics of ocean surfaces. Then the scattered pulse for arbitrary incident pulse is derived utilizing the two-frequency mutual coherence function for wide-sense stationary uncorrelated scattering channel. Finally the two-frequency mutual coherence function and the scattered pulse with a Gaussian modulated or rectangular incident pulse from two-dimensional non-Gaussian rough ocean surfaces for different wind speed are numerically simulated, and the pulse broadening phenomenon is discussed.

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