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提出下视频率步进雷达对电大复杂三维体目标电磁散射数值模拟、成像,以及几何特征的重构.采用双向射线解析跟踪BART方法(bidirectional analytic ray tracing method),数值计算随机粗糙面上电大复杂三维目标的极化散射场;基于下视聚束模式的频率步进雷达合成二维圆弧形孔径,获取包含幅度与相位的三维后向散射矩阵;通过波数域的三维插值,获取在XYZ坐标系中的均匀重采样数据;再对重采样数据进行三维快速Fourier变换(3D-FFT)快速获得三维聚焦图像,实现三维目标几何特征的重构.同时,采用基于物理光学(physical optics,PO)的FEKO软件计算简单体目标的散射场及其成像与重构,作为验证与比较.论证了本文对于地面背景上三维复杂体目标散射、成像与重构的可行、准确、高效的良好性能. 更多还原

【Abstract】 Numerical simulations of polarized scattering-3D imaging-profile reconstruction of a complex-shaped electric-large target above a rough surface are developed.The bidirectional analytic ray tracing (BART) method is first applied to calculation of polarized scattering from volumetric target and surface.By using the step-frequency (SF) radar working in downward-looking spotlight mode and moving within a two-dimensional circular arc aperture,a 3D matrix of backscattering fields in both the amplitude... 更多还原