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31 January 2001 Compensation of strongly heterogeneous atmospheric distortions in Fourier telescopy of remote rough objects
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Abstract
Fourier telescopy is not used for reconstructing the remote rough objects images in turbulent atmosphere by means of the illumination of the objects by arrays of laser emitters. In result the object surface is modulated by sinusoidal patterns with various periods and orientations, forming interfering laser beams, and the energy of scattered light contains different space Fourier components of object image intensity distribution. These components critically distorted by multipliers in the form of direction diagrams of laser emitters int eh case of strongly heterogeneous atmospheric turbulence when laser emitters sizes exceeds correlation radius of phase distortions of laser beams. For this case the method of atmospheric turbulence compensation, based on the combining the operation of division by direction diagrams amplitudes of distorted Fourier components with famous compensation method, based on the phase closure algorithm, is proposed. Because of considerable broadening of laser beams in a strongly heterogeneous atmosphere, only a small portion of light falls on the object and, therefore, the probability of detecting such weak signals from the object in the presence of additive noises is small. The surface roughness scattering also decreases the detection probability. The methods of increasing the probability and of calculating it in dependence on surface roughness parameters and the parameters of phase distortions caused by the turbulent atmosphere are proposed.
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Valery I. Mandrosov, Peter Alexseevich Bakut, and Victor L. Gamiz "Compensation of strongly heterogeneous atmospheric distortions in Fourier telescopy of remote rough objects", Proc. SPIE 4167, Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing, (31 January 2001); https://doi.org/10.1117/12.413822
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