二维纹理特征指数谱粗糙面的极化散射

Polarimetric scattering from two-dimensional exponent spectrum rough surface characterized by textures

研究了具有纹理特征的二维指数谱粗糙面的极化散射特性。在两个方向上相关长度的比值足够大时指数谱粗糙面表现为条纹特征,而在比值接近为一时又表现为方格特征。这两种视觉特征又可以通过傅里叶变化旋转得到不同的纹理角效果。通过粗糙面的小面元积分,推导出椭圆极化入射时笛卡尔坐标系下的散射场,并得到了不同纹理特征指数谱粗糙面的极化散射。结果显示极化散射特性的研究对利用遥感信息提取粗糙面的纹理特征具有重要意义。

The properties of the polarimetric scattering from two-dimensional exponent spectrum rough surface characterized by textures are studied.If the ratio of the correlation lengths in two directions is large enough,the rough surface is characterized by stripe textures,while the ratio is close to one,the surface seems to be block textures.The visional effect on different texture angles of both characters can be obtained by the angle rotating in Fourier transform.The scattered field is derived in Cartesian coordinate system through the integration of scattering facets with the elliptic polarized wave incidence.The polarized radar cross section（RCS） from the exponent spectrum rough surface characterized by textures is computed.The numerical results show that it is significant to investigate the polarimetric RCS for retrieving texture character of the rough surface.