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Proceedings Paper

Possible effects of clear-air refractive-index perturbations on SAR images
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Paper Abstract

Airborne synthetic aperture radar (SAR) imaging systems have reached a degree of accuracy and sophistication that requires the validity of the free-space approximation for radio-wave propagation to be questioned. Based on the thin-lens approximation, a closed-form model for the focal length of a gravity wave-modulated refractive-index interface in the lower troposphere is developed. The model corroborates the suggestion that mesoscale, quasi-deterministic variations of the clear-air radio refractive-index field can cause diffraction patterns on the ground that are consistent with reflectivity artifacts occasionally seen in SAR images, particularly in those collected at long ranges, short wavelengths, and small grazing angles.

Paper Details

Date Published: 16 May 2005
PDF: 9 pages
Proc. SPIE 5788, Radar Sensor Technology IX, (16 May 2005); doi: 10.1117/12.605651
Show Author Affiliations
Andreas Muschinski, Univ. of Massachusetts, Amherst (United States)
Fred M. Dickey, Sandia National Labs. (United States)
Armin W. Doerry, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 5788:
Radar Sensor Technology IX
Robert N. Trebits; James L. Kurtz, Editor(s)

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