Authors

L. C. Andrews; R. L. Phillips;C. Y. Hopen

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

atmospheric optics; scintillation; optical wave propagation; laser; satellite communication; GROUND-TO-SPACE; OPTICAL SCINTILLATION; TURBULENT ATMOSPHERE; INNER-SCALE; Optics

Abstract

A scintillation model is developed for uplink-downlink optical communication channels applicable in moderate to strong fluctuation conditions that may arise under large zenith angles between transmitter and receiver. The model developed here is an extension of a recently published theory that treats irradiance fluctuations along a horizontal path as a modulation of small-scale scintillation by large-scale scintillation. For a downlink path the scintillation index is modeled like that of an infinite plane wave, and for an uplink path we consider a spherical wave model. In both cases the scintillation index agrees with conventional weak-fluctuation-theory results out to zenith angles of 45 to 60 deg. The covariance function of irradiance fluctuations is also developed under the same conditions as assumed for the scintillation index. On a downlink path under small zenith angles the implied correlation length is proportional to the Fresnel-zone scale. For zenith angles exceeding 85 deg, the downlink correlation length varies directly with the spatial coherence radius weighted by a factor that depends on changes in C-n(2), the refractive index structural parameter with altitude.

Journal Title

Optical Engineering

Volume

39

Issue/Number

12

Publication Date

12-31-1999

Document Type

Article

Language

English

First Page

3272

Last Page

3280

WOS Identifier

WOS:000166413000021

ISSN

0091-3286

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