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Aperture averaging effects on the probability density of irradiance fluctuations in moderate-to-strong turbulence
Vetelino, Frida Strömqvist; Young, Cynthia; Andrews, Larry; Recolons Martos, Jaume
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
The lognormal (LN) and gamma–gamma (GG) distributions are compared to simulated and experimental data of the irradiance fluctuations of a Gaussian beam wave propagating through the atmosphere along a horizontal path, near the ground, in the moderate-to-strong turbulence regime. Irradiance data were collected simultaneously at three receiving apertures of different sizes. Atmospheric parameters were inferred from the measurements and scintillation theory and were used to develop the parameters for the theoretical probability density functions. Numerical simulations were produced with the same Cn 2 value as the experimental data. Aperture-averaging effects were investigated by comparing the irradiance distributions for the three apertures at two different values of the structure parameter Cn 2 , and, hence, different values of the coherence radius 0. For the moderate-to-strong fluctuation regime, the GG distribution provides a good fit to the irradiance fluctuations collected by finite-sized apertures that are significantly smaller than 0. For apertures larger than or equal to 0, the irradiance fluctuations appear to be LN distributed.
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació
Àrees temàtiques de la UPC::Ciències de la visió
Photon-photon interactions
Lognormal distribution
Signal theory (Telecommunication)
Lognorma
Gamma–gamma
Senyal, Teoria del (Telecomunicació)
Òptica
Attribution-NonCommercial-NoDerivs 2.5 Generic
http://creativecommons.org/licenses/by-nc-nd/2.5/
Article
Optical Society of America
         

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