复杂海面电磁散射的修正面元模型

发布时间：2019-01-28 22:44

【摘要】：针对合成孔径雷达成像系统中,利用传统面元模型在含泡沫的复杂海面环境下得到的面元后向散射场误差较大,导致成像模糊的问题,提出了一种复杂海面电磁散射的修正面元(MFM)模型。首先建立精确的海水介电模型来计算含泡沫海面介电常数;然后基于Elfouhaily海谱模型生成具体的海面样本,并将其划分成一个个小面元;最后计算出各面元的散射场,将其叠加得到海面样本的散射结果。与实测数据的对比表明,传统面元模型在大入射角时的仿真结果出现衰减现象,而加入泡沫的修正面元模型将使衰减降低近10dB,增强了与实测数据的吻合度。采用MFM模型对海面电磁散射特性及布儒斯特效应进行实验,结果表明:风速对海面布儒斯特效应影响较大,在P波段当风速由4m/s增大至10m/s时,布儒斯特效应减弱85%左右。
[Abstract]:In the synthetic Aperture Radar (SAR) imaging system, the error of the backscattering field obtained by using the traditional panel model in the complex sea environment with foam is large, which leads to the problem of blurred imaging. A modified facet element (MFM) model for complex sea surface electromagnetic scattering is proposed. Firstly, a precise seawater dielectric model is established to calculate the dielectric constant of the sea surface containing foam, and then the specific sea surface samples are generated based on the Elfouhaily sea spectrum model, and they are divided into small surface elements. Finally, the scattering fields of each plane are calculated, and the scattering results of sea surface samples are obtained by superposing them. The comparison with the measured data shows that the simulation results of the traditional panel model show attenuation phenomenon at large incident angle, while the modified facade element model with foam will reduce the attenuation by nearly 10 dB, and enhance the consistency with the measured data. The MFM model is used to test the electromagnetic scattering characteristics of sea surface and the Brewster effect. The results show that the wind speed has a great influence on the Brewster effect, and when the wind speed increases from 4m/s to 10m/s in P-band, The Brewster effect was reduced by about 85%.
【作者单位】：空军工程大学防空反导学院;
【基金】：国家自然科学基金资助项目(61372033)
【分类号】：TN957.52

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