Accession Number:

AD1090560

Title:

Simulating Anisoplanatic Turbulence Via Correlations Of Zernike Coefficients (Preprint)

Descriptive Note:

Conference Paper

Corporate Author:

Purdue University West Lafayette United States

Personal Author(s):

Report Date:

2020-01-31

Pagination or Media Count:

13.0

Abstract:

Simulating atmospheric turbulence is an essential task for evaluating turbulence mitigation algorithms and training learning-based methods. Advanced numerical simulators for atmospheric turbulence are available, but they require sophisticated wave propagations which are computationally very expensive. In this paper, we present a propagation-free method for simulating imaging through anisoplanatic atmospheric turbulence. The key innovation that enables this work is a new method to draw spatially correlated tilt sand high-order aberrations in the Zernike space. By establishing the equivalence between the angle-of-arrival correlation by Basu, McCrae and Fiorino 2015 and the multi-aperture correlation by Chanan 1992, we show that the Zernike coefficients can be drawn according to a covariance matrix defining the spatial correlations. We propose fast and scalable sampling strategies to draw these samples. The new method allows us to compress the wave propagation problem into a sampling problem, hence making the new simulator significantly faster than the existing ones. Experimental results show that the simulator has an excellent match with the theory and real turbulence data.

Subject Categories:

  • Atmospheric Physics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE