Intensity scintillation index of finite beam opticalpropagation in a turbulent atmosphere

Jenu, Markku; Bebbington, D.H.O.

doi:10.1049/el:19940411

Cited by 1 publication

(1 citation statement)

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“…32 Other numerical approaches that model Gaussian beam propagation have met with success as well. 33,34 Simulations of the double pass of an optical wave through a phase screen after reflection from a mirror have been done to examine enhanced backscatter. 35 A related speckle modeling approach, which neglected atmospheric turbulence effects, used Fresnel propagation to simulate the creation of a speckle pattern and determine the number of speckle integrated in a receiver aperture for different target geometries.…”

Section: Modelmentioning

confidence: 99%

Wave optics simulation of atmospheric turbulence and reflective speckle effects in CO_2 lidar

et al. 2000

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Laser speckle can influence lidar measurements from a diffuse hard target. Atmospheric optical turbulence will also affect the lidar return signal. We present a numerical simulation that models the propagation of a lidar beam and accounts for both reflective speckle and atmospheric turbulence effects. Our simulation is based on implementing a Huygens-Fresnel approximation to laser propagation. A series of phase screens, with the appropriate atmospheric statistical characteristics, are used to simulate the effect of atmospheric turbulence. A single random phase screen is used to simulate scattering of the entire beam from a rough surface. We compare the output of our numerical model with separate CO 2 lidar measurements of atmospheric turbulence and reflective speckle. We also compare the output of our model with separate analytical predictions for atmospheric turbulence and reflective speckle. Good agreement was found between the model and the experimental data. Good agreement was also found with analytical predictions. Finally, we present results of a simulation of the combined effects on a finite-aperture lidar system that are qualitatively consistent with previous experimental observations of increasing rms noise with increasing turbulence level.

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