Atmospheric and Ocean Optics

Reanalysis of turbulence effects on short-exposure passive imaging

[+] Author Affiliations
David H. Tofsted

U.S. Army Research Laboratory, Computational and Information Sciences Directorate, Attn: RDRL-CIE-D, White Sands Missile Range, New Mexico 88002-5501

Opt. Eng. 50(1), 016001 (January 26, 2011). doi:10.1117/1.3532999
History: Received August 20, 2010; Revised November 03, 2010; Accepted November 04, 2010; Published January 26, 2011; Online January 26, 2011
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The standard method for modeling the atmospheric short-exposure modulation transfer function (MTF) is due to Fried. This method involves evaluating the impact of amplitude and phase modulations of the propagating wavefront after the removal of the mean wavefront tilt. This tilt is determined by a least-squares analysis. We retain a term involving the correlation between tilt-corrected phase and computed tilt vector that was formerly assumed to be zero. Inclusion of this term yields a new turbulence-strength–dependent effect that degrades performance at high integrated turbulence levels and also predicts super-resolution effects at lower integrated turbulence levels. An analytical approximation is derived from this analysis that describes the new MTF model as a function of three dimensionless parameters related to the angular frequency, system aperture diameter, and integrated turbulence strength.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Topics

Turbulence

Citation

David H. Tofsted
"Reanalysis of turbulence effects on short-exposure passive imaging", Opt. Eng. 50(1), 016001 (January 26, 2011). ; http://dx.doi.org/10.1117/1.3532999


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