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Study of synthetic aperture ladar imaging through atmospheric turbulence

To investigate the influence of atmospheric turbulence on the imaging of SAL, numerical simulation of phase screens is a an effective means. But the widely-used spectral approach which generate phase screens following the Kolmogorov spectrum by using spectrum inverse transform lacks in the low frequency because of which low-frequency modification is indispensable and computation enlargement is unavoidable. Another way of generating phase screen based on the fractal characteristics is introduced in the paper. The phase screen obtained in this way agrees well with theoretical results from turbulent statistical characteristics both in low and high frequency region besides the computation is less. Detailed pictures of monolayer and multilayer random phase screens are given. The calculated multilayer random phase screens are used to simulate the real atmospheric turbulence. At last the image of point target is implemented with SAL in strong, mediate and weak atmospheric turbulence by numerical simulation under vertical side-looking strip-mode. The results show that the atmospheric turbulence can severely affect the azimuth resolution of the SAL image and with the increase of the atmospheric turbulence, the distortion of the SAL image deteriorates.