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在合成孔径雷达(SAR)空对地观测中,倾斜地表面的同极化回波极大值所对应的入射波极化的取向角ψ≠0.由ψ≠0迁移,通过二次相干飞行SAR或干涉SAR(INSAR)图像可确定地表面坡度与反演地面数字高程(DEM).用全极化散射Muellel矩阵解,将ψ≠0的迁移表示为SAR测量的散射Stokes参数Ivs,Ihs,Us的函数.通过Euler角变换,把ψ迁移与倾斜地表面的水平方位角、射程角以及SAR观测的几何结构联系起来.在只能获得单次飞行SAR数据的情况下,提出用倾斜地表水平方位排列产生的图像纹理作形态学细化算法来确定水平方位角.这样用一次飞行的SAR图像数据,可确定水平方位角和射程角及其坡度分布,用完整多重网格算法数值求解地面高程的Poisson方程,得到地形DEM的反演.
In space-to-Earth observation of Synthetic Aperture Radar (SAR), the orientation angle ψ ≠ 0 of the incident wave polarization corresponding to the maximum value of the co-polarized echo on the inclined surface is shifted from ψ ≠ 0, SAR or INSAR images can be used to determine the slope of the surface and to invert the DEM. Using the fully polarized scatter Muellel matrix solution, the migration of ψ ≠ 0 is expressed as the scattered Stokes parameters Ivs, Ihs, Us function. The Euler Angular Transform correlates the ψ migration with the horizontal azimuth, range angle, and geometry of the SAR observations on the sloping ground surface. In the case of only obtaining single-flight SAR data, The image texture generated by the azimuth alignment is used to determine the horizontal azimuth by the morphological refinement algorithm, so that the horizontal azimuth, the range angle and the slope distribution can be determined by using a single flight SAR image data, and the ground elevation Poisson equation, the terrain DEM inversion.