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海面建模和仿真是检验SAR成像算法和海浪谱反演算法的重要手段。当海面长波波长大于雷达距离向分辨率时,长短波间的调制作用是海面SAR成像的决定因素。针对线性模型和已有非线性模型在反映复杂海况时存在的不足,对Longuet-Higgins模型进行扩展,提出一个长波与多个短波非线性作用的深海海面模型,并进行三维数值模拟。该模型不仅易于实现,也更容易扩展到一个长波与任意多个短波非线性作用的复杂海况建模。
Sea surface modeling and simulation are important means to test SAR imaging algorithms and ocean wave inversion algorithms. When the long wavelength of the sea surface is greater than the distance resolution of the radar, the modulation between the long and short waves is the decisive factor of the sea surface SAR imaging. Aiming at the shortcomings of the linear model and the existing nonlinear model in reflecting complex sea conditions, the Longuet-Higgins model is extended. A deep sea surface model with long wave and multiple shortwave nonlinearities is proposed and three-dimensional numerical simulation is carried out. The model is not only easy to implement, but also extends to a complex sea state modeling with long wave and any number of shortwave nonlinearities.