基于二尺度模型的星载SAR海面场景成像仿真

Simulation of polarization SAR imaging of ocean surface based on the two-scale model

根据海浪随机理论进行了粗糙海面建模,利用海面的二尺度模型,构造了包含涌浪在内的随机粗糙海面,同时考虑了不同尺度波浪对海面的影响。基于此海面模型,利用Bragg散射模型和Kirchhoff近似并考虑海面运动所产生的速度聚速效应,模拟了不同情况下海浪的极化SAR图像。最后对海浪参数与SAR参数对极化图像的影响做了分析,证明了模拟的正确性与有效性。

Simulation of polarization synthetic aperture radar（SAR） imaging of ocean wave has great significance on ocean surface scattering.According to the theory of random ocean wave,rough ocean surface is modeled in this paper.Random rough ocean surface which contains swell is constructed using the two-scale-model.This treatment takes both the large scale and small scale surface into account.By using the Bragg scattering model and the Kirchhoff approximation method,polarization SAR images of the modeled ocean surface based on various parameters are simulated.The effects of the parameters of ocean waves and the parameters of SAR system are analyzed.Finally,some useful conclusions are drawn,which are helpful for extracting the information of ocean surface.