DOI: 10.17586/2226-1494-2019-19-6-959-965


СOMPARISON OF ON-LINE AND OFF-LINE FRIED PARAMETER ESTIMATION METHODS

O. A. Soloviev, G. V. Vdovin, V. V. Bezzubik


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Soloviev O.A., Vdovin G.V., Bezzubik V.V. Сomparison of on-line and off-line Fried parameter estimation methods. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2019, vol. 19, no. 6, pp. 959–965 (in English). doi: 10.17586/2226-1494-2019-19-6-959-965



Abstract

We address the problem of high-accuracy estimation of the Fried parameter r0 by comparing two approaches based on estimation of statistical properties of intensity-based wavefront measurements with parameter-fitting to the theoretically predicted values. In the first approach, the phase of the aberration-degraded field is restored from the measurements to obtain the statistical estimate for the structure function. Due to the iterative nature of the most phase retrieval methods, this approach requires significant computational time and thus cannot provide results in real time. In the second approach, the structure function of the sub-aperture wavefront slopes is directly calculated and related to the turbulence parameters in real time. We describe the equations used to obtain the estimate of the Fried parameter by both methods and check their accuracy with numerical simulations.


Keywords: wavefront aberrations, imaging through turbulence, Fried parameter, turbulence statistics

Acknowledgements. The research is carried out at ITMO University (grant 074-11-2018-004) under the financial support of the Ministry of Science and Higher Education of the Russian Federation. The authors are very grateful to F. Inochkin for his assistance in preparing the manuscript for publication.

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