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为研究大气湍流对合成孔径激光雷达(SAL)的成像影响,采用谱反演法对符合Kolmogorov谱的大气随机相位屏进行了数值模拟,给出了单层及多层叠加的随机相位屏图像;然后以多层随机相位屏叠加方式模拟实际大气湍流,计算了无湍流、弱湍流、中等湍流和强湍流等情况下理想机载单站聚束式SAL对点目标以及扩展目标的成像,模拟成像表明大气湍流对SAL成像的方位分辨率有严重影响,湍流越强,图像方位向分辨率越差;针对湍流造成的SAL图像方位向分辨率降低,采用相位梯度自聚焦(PGA)算法对SAL图像进行了方位向补偿,结果有效地改善了图像的聚焦效果,提高了成像质量。
In order to study the influence of atmospheric turbulence on the imaging of Synthetic Aperture Radar (SAL), a stochastic phase-screen image of Kolmogorov-fitted atmospheric stochastic phase screen was simulated by spectrum inversion method. Then the real atmospheric turbulence is simulated by multi-layer random phase-screen superposition method. The imaging and simulation imaging of the point target and the extended target of the ideal airborne single-station spot SAL with no turbulence, weak turbulence, medium turbulence and strong turbulence are calculated. It is shown that the atmospheric turbulence has a serious impact on the azimuth resolution of SAL imaging. The stronger the turbulence, the worse the azimuth resolution of the image. The azimuthal resolution of the SAL image caused by turbulence is reduced, and the phase contrast gradient self-focusing (PGA) The azimuth compensation was carried out, which effectively improved the focusing effect of the image and improved the imaging quality.