Based on the second-order composite surface and stochastic multi-scale models

an ocean surface backscattering model was proposed

including both the large-/intermediate-/small- scale scattering and the second-order Bragg scattering.Within this frame

we derived a second-order Bragg scattering expression

and developed an analytic solution of hydrodynamic modulation function according to weak hydrodynamic interaction theory.In addition

tilt modulation was simulated through the observation angle transform between nominal and local coordinate systems.The result shows that reasonable agreement between measured and simulated data is obtained

and this model is better than the two models mentioned above.