8 September 2004 Round-trip turbulence ladar scintillation modeling using data fits and resulting signal-to-noise ratio
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Abstract
The signal-to-noise power ratio parameter of coherent ladar systems operating within the atmosphere and including atmospheric scintillation effects is modeled. Previously published round-trip geometry ladar data of the variance of the normalized-irradiance as a function of the one-way path integral Rytov parameter are utilized to estimate a signal-tonoise power ratio. However, these data were taken in the strong signal case where local-oscillator-laser noise was negligible. A model is proposed to combine the local-oscillator-laser produced noise, a zero-mean wideband-Gaussian random process corresponding to normal coherent ladar operation, with the scintillation produced by round-trip turbulence based on a calculation of the one-way path-integral Rytov parameter. Close agreement with Shapiro's 1981 analysis is found, provided one modifies the Shapiro formulation to account for scintillation saturation.
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Douglas G. Youmans, Douglas G. Youmans, "Round-trip turbulence ladar scintillation modeling using data fits and resulting signal-to-noise ratio", Proc. SPIE 5413, Laser Systems Technology II, (8 September 2004); doi: 10.1117/12.560808; https://doi.org/10.1117/12.560808
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