Journal ArticleDOI
Effect of a Turbulent Medium on the Power Pattern of a Wavefront-Tracking Circular Aperture*
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TLDR
In this article, the angular power pattern for a circular aperture receiving a plane wave perturbed in transmission through a turbulent atmosphere is obtained for a conventional angle-tracking servomechanism.Abstract:
The angular power pattern, or equivalently the image-plane intensity distribution, is obtained for a circular aperture receiving a plane wave perturbed in transmission through a turbulent atmosphere. The aperture is assumed always to be aligned so as to maximize the received power. This alignment is shown to be that effected by a conventional angle-tracking servomechanism. Homogeneous, isotropic turbulence is assumed, and the aperture is taken to be of moderate size so that the 5/3-power law phase-structure function predicted by use of the Obukhov–Kolmogorov theory of turbulence applies adequately over its full extent. It is assumed also that the departure of the incident wavefronts from planarity everywhere on the aperture is small relative to a wavelength. This condition is shown to be met for relatively large deviation of phase from that of an unperturbed plane wave. Power patterns for tracking and nontracking apertures are compared.read more
Citations
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Journal ArticleDOI
Effect of turbulent fluctuations in an optically active fluid medium.
TL;DR: In this paper, the effect of a beam traversing an optically active medium of turbulent fluctuations of the index of refraction in the medium is investigated theoretically, and the general far-field case is solved by integration of the wave equation with both gain and fluctuations of index refraction, simplified by neglecting the Laplacian of the fluctuating part of the electric field.
Journal Article
Communication theory for the turbulent atmosphere
TL;DR: In this article, the effects of atmospheric turbulence on optical communication systems are discussed. But the focus of the paper is on how statistical communication theory can be used to combat these effects.
Journal ArticleDOI
Communication theory for the turbulent atmosphere
TL;DR: An examination of how statistical communication theory can be used to combat the effects of atmospheric turbulence in optical communication systems is examined to provide a framework to be used in discussing and relating the analytical results presently available in the literature and in motivating and guiding future work.
Journal ArticleDOI
Atmospheric optical communications systems
TL;DR: In this article, the authors present a survey of optical systems operating partly or entirely within the atmosphere, and discuss the components, signaling, and diversity techniques which will partially overcome atmospheric limitations.
Journal ArticleDOI
Image degradation with random wavefront tilt compensation
TL;DR: In this paper, the mean square angle of arrival (MSAO) was derived for linear and circular apertures with various exponential weightings using the description of phase statistics derived by Tatarski from the Obukhov-Kolmogorov theory of locally homogeneous turbulence.
References
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Journal ArticleDOI
Statistics of a Geometric Representation of Wavefront Distortion
TL;DR: In this paper, a statistical definition for the geometric shape of a randomly distorted wavefront was established and relationships between the phase-structure function and the statistics governing the shape were derived.
Journal ArticleDOI
Power Loss in Propagation Through a Turbulent Medium for an Optical-Heterodyne System with Angle Tracking*
TL;DR: In this article, the power loss due to propagation through a turbulent medium is considered for an optical-heterodyne detection system whose axis tracks perfectly the instantaneous direction for maximum signal power.
Journal ArticleDOI
Antenna radiation characteristics with partially coherent illumination
TL;DR: In this paper, the radiation characteristics of a partially coherent illuminated antenna were found for both a circular aperture and a linear antenna. But the antenna illumination function is assumed to be Gaussian, and the phase structure function in the plane of the antenna is of the form cr^{
u}, with
u = 1, 5/3, and 2.