Sparse array configurations yielding uniform MTFs in reciprocal path imaging applications

Harvey, James E.; Kotha, Anita

doi:10.1016/0030-4018(94)90317-4

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…H-h0) For a target that is far beyond the turbulence layer, the down-link field transverse spatial coherence length of a spherical wave is accurately approximated by the plane wave expression"6 'down (L46 k2 n0)315 cos315 (,) (11) The spatial coherence width models for the up-link and down-link waves as a function of altitude are illustrated in Figure 1.…”

Section: Atmospheric Turbulence Scattering Theorymentioning

confidence: 99%

Atmospheric turbulence reciprocal-path-scattering effects for a ground-based monostatic laser radar tracking a space target

Murphy

Phillips

1996

SPIE Proceedings

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A phenomenological model is developed for the strength and spatial width of the backscattered coherent intensity peak produced by reciprocal path scattering through atmospheric turbulence. The model is applied to a ground-based monostatic laser radar tracking a space target under optically saturated atmospheric turbulence conditions. The models for the amplitude and width ofthe RPS peak are based upon the spatial coherence widths of the propagating fields over the up-link and down-link paths within the atmospheric turbulence as well as the cross-sectional area of the up-link beam.

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Section: Atmospheric Turbulence Scattering Theorymentioning

confidence: 99%

Atmospheric turbulence reciprocal-path-scattering effects for a ground-based monostatic laser radar tracking a space target

Murphy

Phillips

1996

SPIE Proceedings

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“…The cross-interference of these reciprocal path field partners is therefore always constructive at point A, regardless of the round-trip propagation path length. The average backscattered intensity at the source point is then given by = (K1) (KDS) 1 (9) where <1(1> represents the average intensity loss due to propagation and single scattering and <icDs> accounts for the additional losses produced by double scattering. In this case, the average coherent and incoherent backscattered intensity components' are written as 2)2(m1) (12) pairs of point scatterers between which double scattering may occur.…”

Section: Geometrical Optics Model For Rough Surface Reciprocal Path Smentioning

confidence: 99%

Reciprocal path scattering due to the combination of atmospheric turbulence and rough surfaces

Murphy

Phillips

1995

SPIE Proceedings

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The topic of enhanced backscattering (BBS) from random media has generated considerable research interest for the last two decades in Eastern Europe and for the last decade in the West. Two distinct scattering phenomena that are unique to scattering by random media are capable of producing enhanced backscatter: coherent reciprocal path scattering (RPS) and incoherent random focusing events. When coherent RPS is responsible for EBS, the maximum enhancement factor is two.Several theoretical models exist for EBS from random rough surfaces and by atmospheric turbulence individually; however, no theoretical model exists for the EBS due to the combination of rough surface and atmospheric turbulence enhancement. Simple geometrical optics models are presented that illustrate the EBS due to RPS by the combination of saturated atmospheric turbulence and a rough surface target upon a monostatic laser radar system.

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Image characteristics in applications utilizing dilute subaperture arrays

1995

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When a large aperture is synthesized with an array of smaller subapertures for high-resolution imaging applications, it is important not only to arrange the subapertures to achieve minimal spatial frequency redundancy but also to choose the size of the subapertures (i.e., the dilution ratio) necessary to achieve the best possible image quality. Spurious or ghost images often occur even for nonredundant dilute subaperture arrays. We show that array configurations producing a uniform modulation transfer function will not exhibit these undesirable ghost images. A prescription that is unique and original (to the best of our knowledge) is then presented for constructing both one-dimensional and two-dimensional configurations of dilute subaperture arrays that results in a uniform spatial frequency response with an arbitrarily high spatial resolution for reciprocal path-imaging applications.

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Sparse array configurations yielding uniform MTFs in reciprocal path imaging applications

Cited by 6 publications

References 19 publications

Atmospheric turbulence reciprocal-path-scattering effects for a ground-based monostatic laser radar tracking a space target

Atmospheric turbulence reciprocal-path-scattering effects for a ground-based monostatic laser radar tracking a space target

Reciprocal path scattering due to the combination of atmospheric turbulence and rough surfaces

Image characteristics in applications utilizing dilute subaperture arrays

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