17 May 2006 Modeling the PDF for the irradiance of an uplink beam in the presence of beam wander
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Proceedings Volume 6215, Atmospheric Propagation III; 621508 (2006); doi: 10.1117/12.666547
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States
Abstract
Recent studies of ground-to-space beam propagation have revealed significant departures from Rytov theory when the beam diameter w0 is on the order of the atmospheric coherence width r0. It has been shown that such departures from Rytov theory are primarily a consequence of beam wander and other low-order aberrations. In this paper we discuss modeling of the probability density function (PDF) for uplink beams. In particular, we show how the PDF transitions from lognormal statistics when w0/r0 << 1 to the negative exponential distribution when w0/r0 >> 1. The most interesting regime is the transition region near w0/r0 = 1, where the statistical behavior of tracked and untracked beams differs significantly.
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Ronald Parenti, Richard J. Sasiela, Larry C. Andrews, Ronald L. Phillips, "Modeling the PDF for the irradiance of an uplink beam in the presence of beam wander", Proc. SPIE 6215, Atmospheric Propagation III, 621508 (17 May 2006); doi: 10.1117/12.666547; https://doi.org/10.1117/12.666547
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KEYWORDS
Scintillation

Turbulence

Atmospheric propagation

Near field

Distortion

Wave propagation

Beam propagation method

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