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.
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