Parameterized blind deconvolution of laser radar imagery using an anisoplanatic optical transfer function

MacDonald, Adam; Cain, Stephen C.

doi:10.1117/1.2393021

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…This combination thus causes the original model to overpredict the behavior, while the new model exhibits the degradation in turbulence performance noted by previous authors. 13,14 Although results were produced for the human eye, these did not prove to be very interesting, for in comparison to the variations seen in the response of the other optics to varying turbulence levels, the human eye showed little responsivity due to variations in either turbulence or range. This is apparently because the aperture is so small that it is relatively impervious to turbulent degradation.…”

Section: Discussionmentioning

confidence: 83%

Short-exposure passive imaging through path-varying convective boundary layer turbulence

Tofsted

2012

SPIE Proceedings

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As is well known, the turbulent coherence diameter is evaluated via an integral over path varying turbulence. However, a recent analysis also suggests a system aperture size effect that interacts with the coherence diameter effect. This effect, due to the phase structure function, produces an altered behavior on the short-exposure atmospheric modulation transfer function (MTF). This behavior can be modeled as multiplicative adjustments to two dimensionless imaging scenario parameters. To illustrate these effects, path dependent turbulence effects are introduced through the context of a daytime convective boundary layer scenario featuring turbulence strength that varies as a function of height to the minus-four-thirds power. Two path geometry cases are studied: slant path propagation above flat terrain, where the object viewed and observer are at varying heights, and propagation between an object viewed and an observer at equal heights above the terrain situated on opposite sides of a valley. Results for both cases show the newly proposed atmospheric MTF is unaltered in form, but that path dependent scaling laws apply to the two governing dimensionless parameters. Scaling relations are plotted for each case studied, and the integral relations developed can be easily computed for further specific cases.

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Section: Discussionmentioning

confidence: 83%

Short-exposure passive imaging through path-varying convective boundary layer turbulence

Tofsted

2012

SPIE Proceedings

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“…For many years researchers (c.f., MacDonald and Cain (8), and Dunphy and Kerr (9)) have alluded to weaknesses in Fried's (2) short-exposure model. The path of this arc led through Tofsted (1) which highlighted the missing term in Fried's approach.…”

Section: Discussionmentioning

confidence: 99%

Short-exposure Turbulent Tilt-phase Frequency Dependence in Passive Imaging

Tofsted¹

2012

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, In a previous paper, short-exposure imaging through atmospheric turbulence was shown to include a non-negligible tilt-phase effect. This effect was modeled as a modifying factor, exp[A(X, Q) ω 2 ], dependent on a normalized angular frequency, ω, and a function A dependent on non-dimensional turbulence (X) and diffraction (Q) related parameters. The present paper describes a subsequent analysis performed at high A ω 2 values that has revealed an additional moderate ω dependence in A. The new functionality of A(X, Q, ω) produces diffraction limited behavior at high frequency, but increases the amount of correction of short-exposure turbulence effects at intermediate frequencies. The resulting behavior is parameterized through a new series of analytic expressions.Turbulence, imaging, short-exposure UU 30

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“…AFIT faculty and students, together with scientists and engineers at the Air Force Research Laboratory Sensors Division (AFRL/SN) have great interest in furthering the state-of-the art of current laser sensors [16], [17], [18]. AFIT, TPS and AFRL have partnered to launch a series of LADAR data collection missions to generate a large database of experimental data to validate analytical and simulated models, as well as spawn new research in 3-dimensional LADAR imagery.…”

Section: -D Laser Radar Experimental Researchmentioning

confidence: 98%

Development and Flight Test of a Reconfigurable Avionics Research Pod for the USAF Test Pilot School

MacDonald

Shepherd

2008

2008 IEEE Aerospace Conference

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Considerable time and money are spent on the modification of fleet-support test aircraft in order to enable carriage of novel research experiments that require in-flight test and demonstration. In many cases, the cost of aircraft modification exceeds the cost of the flight test hardware and flight hours. The USAF Test Pilot School (TPS) has worked closely with the Air Force Institute of Technology (AFIT) to develop and flight test the Reconfigurable Airborne Sensor, Communication and Laser (RASCAL) pod. The pod concept will revolutionize the way that USAF TPS conducts Test Management Project training, and will enable rapid transition of cutting-edge technology under development at AFIT and national laboratories to the demanding airborne flight environment. The development and flight test of RASCAL are discussed, as are future concepts of operation expected to be conducted at the USAF TPS.

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Parameterized blind deconvolution of laser radar imagery using an anisoplanatic optical transfer function

Cited by 9 publications

References 14 publications

Short-exposure passive imaging through path-varying convective boundary layer turbulence

Short-exposure passive imaging through path-varying convective boundary layer turbulence

Short-exposure Turbulent Tilt-phase Frequency Dependence in Passive Imaging

Development and Flight Test of a Reconfigurable Avionics Research Pod for the USAF Test Pilot School

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